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

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

class Example
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      string s1 = "The quick brown fox jumps over the lazy dog";
      string s2 = "fox";
      bool b;
      b = s1.Contains(s2);
      outputBlock.Text += String.Format("Is the string, s2, in the string, s1?: {0}", b) + "\n";
This example produces the following results:

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


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.