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.NET Framework Class Library

String.Concat Method (String, String)

Concatenates two specified instances of String.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Public Shared Function Concat ( _
	str0 As String, _
	str1 As String _
) As String


Type: System.String

The first string to concatenate.

Type: System.String

The second string to concatenate.

Return Value

Type: System.String
The concatenation of str0 and str1.

The method concatenates str0 and str1; it does not add any delimiters.

An Empty string is used in place of any null argument.

The following example concatenates a person's first, middle, and last name.

Public Class ConcatTest
    Public Shared Sub Main()
        Dim fName As String = "Simon" 
        Dim mName As String = "Jake" 
        Dim lName As String = "Harrows" 

        ' We want to simply quickly add this person's name together. 
        ' Because we want a name to appear with a space in between each name,  
        ' we put a space on the front of the middle, and last name, allowing for 
        ' the fact that a space may already be there.
        mName = " " + mName.Trim()
        lName = " " + lName.Trim()

        ' This line simply concatenates the two strings.
        Console.WriteLine("Welcome to this page, '{0}'!", _
                          String.Concat(String.Concat(fName, mName), lName))
    End Sub 
End Class 
' The example displays the following output: 
'       Welcome to this page, 'Simon Jake Harrows'!

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 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

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

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.