.NET Framework Class Library
StringConcat Method (Object, Object)

Concatenates the string representations of two specified objects.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)
Syntax
Public Shared Function Concat ( _
	arg0 As [%$TOPIC/kbseaaft_en-us_VS_110_1_0_0_0_0%], _
	arg1 As [%$TOPIC/kbseaaft_en-us_VS_110_1_0_0_0_1%] _
) As [%$TOPIC/kbseaaft_en-us_VS_110_1_0_0_0_2%]
public static [%$TOPIC/kbseaaft_en-us_VS_110_1_0_1_0_0%] Concat(
	[%$TOPIC/kbseaaft_en-us_VS_110_1_0_1_0_1%] arg0,
	[%$TOPIC/kbseaaft_en-us_VS_110_1_0_1_0_2%] arg1
)
public:
static [%$TOPIC/kbseaaft_en-us_VS_110_1_0_2_0_0%]^ Concat(
	[%$TOPIC/kbseaaft_en-us_VS_110_1_0_2_0_1%]^ arg0, 
	[%$TOPIC/kbseaaft_en-us_VS_110_1_0_2_0_2%]^ arg1
)
static member Concat : 
        arg0:[%$TOPIC/kbseaaft_en-us_VS_110_1_0_3_0_0%] * 
        arg1:[%$TOPIC/kbseaaft_en-us_VS_110_1_0_3_0_1%] -> [%$TOPIC/kbseaaft_en-us_VS_110_1_0_3_0_2%]

Parameters

arg0
Type: SystemObject

The first object to concatenate.

arg1
Type: SystemObject

The second object to concatenate.

Return Value

Type: SystemString
The concatenated string representations of the values of arg0 and arg1.
Remarks

The method concatenates arg0 and arg1by calling the parameterless ToString method of arg0 and arg1; it does not add any delimiters.

StringEmpty is used in place of any null argument.

If either of the arguments is an array reference, the method concatenates a string representing that array, instead of its members (for example, "System.String[]").

Examples

The following example demonstrates the Concat method.

Class stringConcat5
   Public Shared Sub Main()
      Dim i As Integer = - 123
      Dim o As [Object] = i
      Dim objs() As [Object] = {-123, -456, -789}

      Console.WriteLine("Concatenate 1, 2, and 3 objects:")
      Console.WriteLine("1) {0}", [String].Concat(o))
      Console.WriteLine("2) {0}", [String].Concat(o, o))
      Console.WriteLine("3) {0}", [String].Concat(o, o, o))

      Console.WriteLine(vbCrLf & "Concatenate 4 objects and a variable length parameter list:")
      Console.WriteLine("4) {0}", String.Concat(o, o, o, o))
      Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o))

      Console.WriteLine(vbCrLf & "Concatenate a 3-element object array:")
      Console.WriteLine("6) {0}", [String].Concat(objs))
   End Sub 
End Class 
'The example displays the following output: 
'    Concatenate 1, 2, and 3 objects: 
'    1) -123 
'    2) -123-123 
'    3) -123-123-123 
'     
'    Concatenate 4 objects and a variable length parameter list: 
'    4) -123-123-123-123 
'    5) -123-123-123-123-123 
'          
'    Concatenate a 3-element object array: 
'    6) -123-456-789
using System;

class stringConcat5 {
    public static void Main() {
    int i = -123;
    Object o = i;
    Object[] objs = new Object[] {-123, -456, -789};

    Console.WriteLine("Concatenate 1, 2, and 3 objects:");
    Console.WriteLine("1) {0}", String.Concat(o));
    Console.WriteLine("2) {0}", String.Concat(o, o));
    Console.WriteLine("3) {0}", String.Concat(o, o, o));

    Console.WriteLine("\nConcatenate 4 objects and a variable length parameter list:");
    Console.WriteLine("4) {0}", String.Concat(o, o, o, o));
    Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o));

    Console.WriteLine("\nConcatenate a 3-element object array:");
    Console.WriteLine("6) {0}", String.Concat(objs));
    }
}
// The example displays the following output: 
//    Concatenate 1, 2, and 3 objects: 
//    1) -123 
//    2) -123-123 
//    3) -123-123-123 
//     
//    Concatenate 4 objects and a variable length parameter list: 
//    4) -123-123-123-123 
//    5) -123-123-123-123-123 
//     
//    Concatenate a 3-element object array: 
//    6) -123-456-789
using namespace System;

int main()
{
   int i = -123;
   Object^ o = i;
   array<Object^>^objs = { -123, -456, -789};
   Console::WriteLine("Concatenate 1, 2, and 3 objects:");
   Console::WriteLine("1) {0}", String::Concat(o));
   Console::WriteLine("2) {0}", String::Concat(o, o));
   Console::WriteLine("3) {0}", String::Concat(o, o, o));

   Console::WriteLine("\nConcatenate 4 objects and a variable length parameter list:" );
   Console::WriteLine("4) {0}", String::Concat(o, o, o, o));
   Console::WriteLine("5) {0}", String::Concat( o, o, o, o, o));
   Console::WriteLine("\nConcatenate a 3-element object array:");
   Console::WriteLine("6) {0}", String::Concat(objs));
}
// The example displays the following output: 
//    Concatenate 1, 2, and 3 objects: 
//    1) -123 
//    2) -123-123 
//    3) -123-123-123 
//     
//    Concatenate 4 objects and a variable length parameter list: 
//    4) -123-123-123-123 
//    5) -123-123-123-123-123 
//     
//    Concatenate a 3-element object array: 
//    6) -123-456-789
Version Information

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Platforms

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.