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String.Concat Method (Object, Object)

Updated: October 2009

Concatenates the string representations of two specified objects.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
public static string Concat(
	Object arg0,
	Object arg1
)

Parameters

arg0
Type: System.Object

The first object to concatenate.

arg1
Type: System.Object

The second object to concatenate.

Return Value

Type: System.String
The concatenated string representations of the values of arg0 and arg1.

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

String.Empty 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[]").

The following example demonstrates the Concat method.

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

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

October 2009

Expanded the Remarks section.

Information enhancement.

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