<Type Name="NullReferenceException" FullName="System.NullReferenceException" FullNameSP="System_NullReferenceException" Maintainer="ecma">
  <TypeSignature Language="ILASM" Value=".class public serializable NullReferenceException extends System.SystemException" />
  <TypeSignature Language="C#" Value="public class NullReferenceException : SystemException" />
  <MemberOfLibrary>BCL</MemberOfLibrary>
  <AssemblyInfo>
    <AssemblyName>mscorlib</AssemblyName>
    <AssemblyPublicKey>[00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 ]</AssemblyPublicKey>
    <AssemblyVersion>2.0.0.0</AssemblyVersion>
  </AssemblyInfo>
  <ThreadingSafetyStatement>All public static members of this type are safe for multithreaded operations. No instance members are guaranteed to be thread safe.</ThreadingSafetyStatement>
  <Base>
    <BaseTypeName>System.SystemException</BaseTypeName>
  </Base>
  <Interfaces />
  <Docs>
    <summary>
      <para> Represents the error that occurs when there is an attempt
      to dereference a null object reference.</para>
    </summary>
    <remarks>
      <block subset="none" type="note">
        <para>Applications throw the <see cref="T:System.ArgumentNullException" />
   rather than <see cref="T:System.NullReferenceException" />
   .</para>
        <para>The following CIL instructions throw <see cref="T:System.NullReferenceException" />
:</para>
        <list type="bullet">
          <item>
            <term>
      callvirt</term>
          </item>
          <item>
            <term>cpblk</term>
          </item>
          <item>
            <term>cpobj</term>
          </item>
          <item>
            <term>ldelema</term>
          </item>
          <item>
            <term>ldelem.&lt;type&gt;</term>
          </item>
          <item>
            <term>ldfld</term>
          </item>
          <item>
            <term>ldflda</term>
          </item>
          <item>
            <term>ldind.&lt;type&gt;</term>
          </item>
          <item>
            <term>ldlen</term>
          </item>
          <item>
            <term>stelem.&lt;type&gt;</term>
          </item>
          <item>
            <term>stind.&lt;type&gt;</term>
          </item>
          <item>
            <term>stfld</term>
          </item>
          <item>
            <term>throw</term>
          </item>
          <item>
            <term>unbox</term>
          </item>
          <item>
            <term>initblk</term>
          </item>
        </list>
      </block>
    </remarks>
    <example>
      <para>The following example demonstrates an error that causes
      a <see cref="T:System.NullReferenceException" /> exception.</para>
      <code lang="C#">using System;
public class Ints {
   public int[] myInts;
}
public class NullRefExample {
   public static void Main() {
      Ints ints = new Ints();
      try {
         int i = ints.myInts[0];
      }
      catch( NullReferenceException e ) {
         Console.WriteLine( "Caught error: {0}.", e);
      }
   }
}
   </code>
      <para>The output is</para>
      <code>
Caught error: System.NullReferenceException: Object reference not set to an instance of an object.
   at NullRefExample.Main().
 </code>
    </example>
  </Docs>
  <Members>
    <Member MemberName=".ctor">
      <MemberSignature Language="ILASM" Value="public rtspecialname specialname instance void .ctor()" />
      <MemberSignature Language="C#" Value="public NullReferenceException ();" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters />
      <Docs>
        <summary>
          <para>Constructs and initializes a new instance of the <see cref="T:System.NullReferenceException" />
class.</para>
        </summary>
        <remarks>
          <para>This constructor initializes the <see cref="!:System.NullReferenceException.Message" /> property of the new instance to a system-supplied
   message that describes the error, such as "The value 'null' was found where an
   instance of an object was required." This message takes into account the current
   system culture.</para>
          <para>The <see cref="!:System.NullReferenceException.InnerException" /> property is initialized to 
<see langword="null" />.</para>
        </remarks>
      </Docs>
      <Excluded>0</Excluded>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="ILASM" Value="public rtspecialname specialname instance void .ctor(string message)" />
      <MemberSignature Language="C#" Value="public NullReferenceException (string message);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="message" Type="System.String" />
      </Parameters>
      <Docs>
        <param name="message">A <see cref="T:System.String" /> that describes the error. The content of <paramref name="message" /> is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.</param>
        <summary>
          <para>Constructs and initializes a new instance of the <see cref="T:System.NullReferenceException" />
class.</para>
        </summary>
        <remarks>
          <para>This constructor initializes the <see cref="!:System.NullReferenceException.Message" /> property of the new instance using <paramref name="message" />. If <paramref name="message" /> is 
<see langword="null" />, the <see cref="!:System.NullReferenceException.Message" /> property is initialized to the 
   system-supplied message provided by the constructor that takes no arguments. The <see cref="!:System.NullReferenceException.InnerException" /> property is initialized to <see langword="null" />.</para>
        </remarks>
      </Docs>
      <Excluded>0</Excluded>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected NullReferenceException (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);" />
      <MemberType>Constructor</MemberType>
      <Parameters>
        <Parameter Name="info" Type="System.Runtime.Serialization.SerializationInfo" />
        <Parameter Name="context" Type="System.Runtime.Serialization.StreamingContext" />
      </Parameters>
      <Docs>
        <param name="info">To be added.</param>
        <param name="context">To be added.</param>
        <summary>To be added.</summary>
        <remarks>To be added.</remarks>
      </Docs>
    </Member>
    <Member MemberName=".ctor">
      <MemberSignature Language="ILASM" Value="public rtspecialname specialname instance void .ctor(string message, class System.Exception innerException)" />
      <MemberSignature Language="C#" Value="public NullReferenceException (string message, Exception innerException);" />
      <MemberType>Constructor</MemberType>
      <ReturnValue />
      <Parameters>
        <Parameter Name="message" Type="System.String" />
        <Parameter Name="innerException" Type="System.Exception" />
      </Parameters>
      <Docs>
        <param name="message">A <see cref="T:System.String" /> that describes the error. The content of <paramref name="message" /> is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.</param>
        <param name="innerException">An instance of <see cref="T:System.Exception" /> that is the cause of the current Exception. If <paramref name="innerException" /> is non-null, then the current Exception was raised in a catch block handling <paramref name="innerException" /> .</param>
        <summary>
          <para>Constructs and initializes a new instance of the <see cref="T:System.NullReferenceException" />
class.</para>
        </summary>
        <remarks>
          <para>This constructor initializes the <see cref="!:System.NullReferenceException.Message" /> property of the new instance using <paramref name="message" />, and
   the <see cref="!:System.NullReferenceException.InnerException" /> property using
<paramref name="innerException" />. If <paramref name="message" /> is 
<see langword="null" />, the <see cref="!:System.NullReferenceException.Message" /> property is initialized to the 
   system-supplied message provided by the constructor that takes no arguments.</para>
          <para>
            <block subset="none" type="note">For information on
   inner exceptions, see <see cref="P:System.Exception.InnerException" />
   .</block>
          </para>
        </remarks>
      </Docs>
      <Excluded>0</Excluded>
    </Member>
  </Members>
  <TypeExcluded>0</TypeExcluded>
</Type>
