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String.Inequality Operator

Determines whether two specified strings have different values.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static bool operator !=(
	string a,
	string b
)

Parameters

a
Type: System.String
The first string to compare, or null.
b
Type: System.String
The second string to compare, or null.

Return Value

Type: System.Boolean
true if the value of a is different from the value of b; otherwise, false.

The Inequality method defines the operation of the inequality operator for the String class.

This operator is implemented using the Equals method, which means the comparands are tested for a combination of reference and value equality. This operator performs an ordinal comparison.

NoteNote

   The Visual Basic compiler does not resolve the inequality operator as a call to the Inequality method. Instead, the inequality operator wraps a call to the Operators.CompareString method.

The following example demonstrates the inequality operator.


// Example for the String Inequality operator.
using System;

class InequalityOp 
{
    public static void Main() 
    {
        Console.WriteLine( 
            "This example of the String Inequality operator\n" +
            "generates the following output.\n" );

        CompareAndDisplay( "ijkl" );
        CompareAndDisplay( "ABCD" );
        CompareAndDisplay( "abcd" );
    }

    static void CompareAndDisplay( String Comparand )
    {
        String  Lower = "abcd";

        Console.WriteLine( 
            "\"{0}\" != \"{1}\" ?  {2}",
            Lower, Comparand, Lower != Comparand );
    }
}

/*
This example of the String Inequality operator
generates the following output.

"abcd" != "ijkl" ?  True
"abcd" != "ABCD" ?  True
"abcd" != "abcd" ?  False
*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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