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String.Concat Method (Object)

Updated: August 2010

Creates the string representation of a specified object.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static string Concat(
	Object arg0
)

Parameters

arg0
Type: System.Object

The object to represent, or null.

Return Value

Type: System.String
The string representation of the value of arg0, or String.Empty if arg0 is null.

The Concat method represents arg0 as a string by calling its parameterless ToString method.

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

August 2010

Revised the Remarks section.

Customer feedback.

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