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.NET Framework Class Library

String.Contains Method

Returns a value indicating whether a specified substring occurs within this string.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Public Function Contains ( _
	value As String _
) As Boolean

Parameters

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.
Exception Condition
ArgumentNullException

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 
Imports System

Class Sample
   Public Shared Sub Main()
      Dim s1 As String = "The quick brown fox jumps over the lazy dog" 
      Dim s2 As String = "fox" 
      Dim b As Boolean
      b = s1.Contains(s2)
      Console.WriteLine("Is the string, s2, in the string, s1?: {0}", b)
   End Sub 'Main
End Class 'Sample

'This example produces the following results: 

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

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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