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String.Contains Method

Returns a value indicating whether the specified String object occurs within this string.

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

public bool Contains(
	string value


Type: System.String

The String object to seek.

Return Value

Type: System.Boolean
true if the value parameter occurs within this string, or if value is the empty string (""); otherwise, false.


value is null.

This method performs an ordinal (case-sensitive and culture-insensitive) comparison. The search begins at the first character position of this string and continues through the last character position.

The following example determines whether the string "fox" is a substring of a familiar quotation.

// This example demonstrates the String.Contains() method 
using System;

class Sample 
    public static void Main() 
    string s1 = "The quick brown fox jumps over the lazy dog";
    string s2 = "fox";
    bool b;
    b = s1.Contains(s2);
    Console.WriteLine("Is the string, s2, in the string, s1?: {0}", b);
This example produces the following results:

Is the string, s2, in the string, s1?: True

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0, 2.0, 1.0

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