﻿<?xml version="1.0" encoding="utf-8"?><Type Name="DBNull" FullName="System.DBNull"><TypeSignature Maintainer="auto" Language="C#" Value="public sealed class DBNull : IConvertible, System.Runtime.Serialization.ISerializable" /><TypeSignature Language="ILAsm" Value=".class public auto ansi serializable sealed beforefieldinit DBNull extends System.Object implements class System.IConvertible, class System.Runtime.Serialization.ISerializable" /><AssemblyInfo><AssemblyName>mscorlib</AssemblyName><AssemblyPublicKey>[00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00]</AssemblyPublicKey><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the &lt;link location="node:gtk-sharp/programming/threads"&gt;Gtk# Thread Programming&lt;/link&gt; for details.</ThreadSafetyStatement><Base><BaseTypeName>System.Object</BaseTypeName></Base><Interfaces><Interface><InterfaceName>System.IConvertible</InterfaceName></Interface><Interface><InterfaceName>System.Runtime.Serialization.ISerializable</InterfaceName></Interface></Interfaces><Attributes><Attribute><AttributeName>System.Runtime.InteropServices.ComVisible(true)</AttributeName></Attribute></Attributes><Docs><remarks><attribution license="cc4" from="Microsoft" modified="false" /><para>The <see cref="T:System.DBNull" /> class represents a nonexistent value. In a database, for example, a column in a row of a table might not contain any data whatsoever. That is, the column is considered to not exist at all instead of merely not having a value. A <see cref="T:System.DBNull" /> object represents the nonexistent column. Additionally, COM interop uses the <see cref="T:System.DBNull" /> class to distinguish between a VT_NULL variant, which indicates a nonexistent value, and a VT_EMPTY variant, which indicates an unspecified value.</para><para>The <see cref="T:System.DBNull" /> type is a singleton class, which means only one <see cref="T:System.DBNull" /> object exists. The <see cref="F:System.DBNull.Value" /> member represents the sole <see cref="T:System.DBNull" /> object. <see cref="F:System.DBNull.Value" /> can be used to explicitly assign a nonexistent value to a database field, although most ADO.NET data providers automatically assign values of <see cref="T:System.DBNull" /> when a field does not have a valid value. You can determine whether a value retrieved from a database field is a <see cref="T:System.DBNull" /> value by passing the value of that field to the DBNull.Value.Equals method. However, some languages and database objects supply methods that make it easier to determine whether the value of a database field is <see cref="F:System.DBNull.Value" />. These include the Visual Basic IsDBNull function, the <see cref="M:System.Convert.IsDBNull(System.Object)" /> method, the <see cref="M:System.Data.DataTableReader.IsDBNull(System.Int32)" /> method, and the <see cref="M:System.Data.IDataRecord.IsDBNull(System.Int32)" /> method.</para><para>Do not confuse the notion of null in an object-oriented programming language with a <see cref="T:System.DBNull" /> object. In an object-oriented programming language, null means the absence of a reference to an object. <see cref="T:System.DBNull" /> represents an uninitialized variant or nonexistent database column.</para></remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Represents a nonexistent value. This class cannot be inherited.</para></summary></Docs><Members><Member MemberName="GetObjectData"><MemberSignature Language="C#" Value="public void GetObjectData (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);" /><MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance void GetObjectData(class System.Runtime.Serialization.SerializationInfo info, valuetype System.Runtime.Serialization.StreamingContext context) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Void</ReturnType></ReturnValue><Parameters><Parameter Name="info" Type="System.Runtime.Serialization.SerializationInfo" /><Parameter Name="context" Type="System.Runtime.Serialization.StreamingContext" /></Parameters><Docs><remarks>To be added</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Implements the <see cref="T:System.Runtime.Serialization.ISerializable" /> interface and returns the data needed to serialize the <see cref="T:System.DBNull" /> object.</para></summary><param name="info"><attribution license="cc4" from="Microsoft" modified="false" />A <see cref="T:System.Runtime.Serialization.SerializationInfo" /> object containing information required to serialize the <see cref="T:System.DBNull" /> object. </param><param name="context"><attribution license="cc4" from="Microsoft" modified="false" />A <see cref="T:System.Runtime.Serialization.StreamingContext" /> object containing the source and destination of the serialized stream associated with the <see cref="T:System.DBNull" /> object. </param></Docs></Member><Member MemberName="GetTypeCode"><MemberSignature Language="C#" Value="public TypeCode GetTypeCode ();" /><MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance valuetype System.TypeCode GetTypeCode() cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.TypeCode</ReturnType></ReturnValue><Parameters /><Docs><remarks>To be added</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Gets the <see cref="T:System.TypeCode" /> value for <see cref="T:System.DBNull" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>The <see cref="T:System.TypeCode" /> value for <see cref="T:System.DBNull" />, which is <see cref="F:System.TypeCode.DBNull" />.</para></returns></Docs></Member><Member MemberName="System.IConvertible.ToBoolean"><MemberSignature Language="C#" Value="bool IConvertible.ToBoolean (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance bool System.IConvertible.ToBoolean(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Boolean</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToByte"><MemberSignature Language="C#" Value="byte IConvertible.ToByte (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance unsigned int8 System.IConvertible.ToByte(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Byte</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToChar"><MemberSignature Language="C#" Value="char IConvertible.ToChar (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance char System.IConvertible.ToChar(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Char</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToDateTime"><MemberSignature Language="C#" Value="DateTime IConvertible.ToDateTime (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance valuetype System.DateTime System.IConvertible.ToDateTime(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.DateTime</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToDecimal"><MemberSignature Language="C#" Value="decimal IConvertible.ToDecimal (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance valuetype System.Decimal System.IConvertible.ToDecimal(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Decimal</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToDouble"><MemberSignature Language="C#" Value="double IConvertible.ToDouble (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance float64 System.IConvertible.ToDouble(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Double</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToInt16"><MemberSignature Language="C#" Value="short IConvertible.ToInt16 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance int16 System.IConvertible.ToInt16(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Int16</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToInt32"><MemberSignature Language="C#" Value="int IConvertible.ToInt32 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance int32 System.IConvertible.ToInt32(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Int32</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToInt64"><MemberSignature Language="C#" Value="long IConvertible.ToInt64 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance int64 System.IConvertible.ToInt64(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Int64</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToSByte"><MemberSignature Language="C#" Value="sbyte IConvertible.ToSByte (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance int8 System.IConvertible.ToSByte(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.SByte</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToSingle"><MemberSignature Language="C#" Value="float IConvertible.ToSingle (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance float32 System.IConvertible.ToSingle(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Single</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToType"><MemberSignature Language="C#" Value="object IConvertible.ToType (Type targetType, IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance object System.IConvertible.ToType(class System.Type targetType, class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.Object</ReturnType></ReturnValue><Parameters><Parameter Name="targetType" Type="System.Type" /><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><param name="targetType">To be added.</param><remarks><attribution license="cc4" from="Microsoft" modified="false" /><para>Three conversions are supported: If the <paramref name="type" /> parameter specifies <see cref="T:System.Object" /> or <see cref="T:System.DBNull" />, the return value is the current <see cref="T:System.DBNull" /> object itself. If the <paramref name="type" /> parameter specifies <see cref="T:System.String" />, the return value is the string returned by the <see cref="M:System.DBNull.ToString" /> method.</para></remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Converts the current <see cref="T:System.DBNull" /> object to the specified type.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>The boxed equivalent of the current <see cref="T:System.DBNull" /> object, if that conversion is supported; otherwise, an exception is thrown and no value is returned. </para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface and is used to augment the conversion. If null is specified, format information is obtained from the current culture. </param></Docs></Member><Member MemberName="System.IConvertible.ToUInt16"><MemberSignature Language="C#" Value="ushort IConvertible.ToUInt16 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance unsigned int16 System.IConvertible.ToUInt16(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.UInt16</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToUInt32"><MemberSignature Language="C#" Value="uint IConvertible.ToUInt32 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance unsigned int32 System.IConvertible.ToUInt32(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.UInt32</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="System.IConvertible.ToUInt64"><MemberSignature Language="C#" Value="ulong IConvertible.ToUInt64 (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance unsigned int64 System.IConvertible.ToUInt64(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.UInt64</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>This conversion is not supported. Attempting to make this conversion throws an <see cref="T:System.InvalidCastException" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>None. The return value for this member is not used.</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />An object that implements the <see cref="T:System.IFormatProvider" /> interface. (This parameter is not used; specify null.)</param></Docs></Member><Member MemberName="ToString"><MemberSignature Language="C#" Value="public override string ToString ();" /><MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance string ToString() cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.String</ReturnType></ReturnValue><Parameters /><Docs><remarks>To be added.</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Returns an empty string (<see cref="F:System.String.Empty" />).</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>An empty string (<see cref="F:System.String.Empty" />).</para></returns></Docs></Member><Member MemberName="ToString"><MemberSignature Language="C#" Value="public string ToString (IFormatProvider provider);" /><MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance string ToString(class System.IFormatProvider provider) cil managed" /><MemberType>Method</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.String</ReturnType></ReturnValue><Parameters><Parameter Name="provider" Type="System.IFormatProvider" /></Parameters><Docs><remarks>To be added</remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Returns an empty string using the specified <see cref="T:System.IFormatProvider" />.</para></summary><returns><attribution license="cc4" from="Microsoft" modified="false" /><para>An empty string (<see cref="F:System.String.Empty" />).</para></returns><param name="provider"><attribution license="cc4" from="Microsoft" modified="false" />The <see cref="T:System.IFormatProvider" /> to be used to format the return value.</param></Docs></Member><Member MemberName="Value"><MemberSignature Language="C#" Value="public static readonly DBNull Value;" /><MemberSignature Language="ILAsm" Value=".field public static initonly class System.DBNull Value" /><MemberType>Field</MemberType><AssemblyInfo><AssemblyVersion>1.0.5000.0</AssemblyVersion><AssemblyVersion>2.0.0.0</AssemblyVersion><AssemblyVersion>4.0.0.0</AssemblyVersion></AssemblyInfo><ReturnValue><ReturnType>System.DBNull</ReturnType></ReturnValue><Parameters /><Docs><remarks><attribution license="cc4" from="Microsoft" modified="false" /><para><see cref="T:System.DBNull" /> is a singleton class, which means only this instance of this class can exist.</para><para>If a database field has missing data, you can use the <see cref="F:System.DBNull.Value" /> property to explicitly assign a <see cref="T:System.DBNull" /> object value to the field. However, most data providers do this automatically.</para><para>To evaluate database fields to determine whether their values are <see cref="T:System.DBNull" />, you can pass the field value to the DBNull.Value.Equals method. However, this method is rarely used because there are a number of other ways to evaluate a database field for missing data. These include the Visual Basic IsDBNull function, the <see cref="M:System.Convert.IsDBNull(System.Object)" /> method, the <see cref="M:System.Data.DataTableReader.IsDBNull(System.Int32)" /> method, the <see cref="M:System.Data.IDataRecord.IsDBNull(System.Int32)" /> method, and several other methods.</para></remarks><summary><attribution license="cc4" from="Microsoft" modified="false" /><para>Represents the sole instance of the <see cref="T:System.DBNull" /> class.</para></summary></Docs></Member></Members></Type>