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String.Format Method (String, Object)

Replaces one or more format items in a specified string with the string representation of a specified object.

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

public static string Format(
	string format,
	Object arg0
)

Parameters

format
Type: System.String

A composite format string.

arg0
Type: System.Object

The object to format.

Return Value

Type: System.String
A copy of format in which any format items are replaced by the string representation of arg0.

ExceptionCondition
ArgumentNullException

format is null.

FormatException

The format item in format is invalid.

-or-

The index of a format item is not zero.

NoteNote

For examples and comprehensive usage information about this and other overloads of the Format method, see the Format overload summary.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.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.

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