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AppDomain.SetData Method (String, Object)

Assigns the specified value to the specified application domain property.

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

public void SetData(
	string name,
	Object data


Type: System.String
The name of a user-defined application domain property to create or change.
Type: System.Object
The value of the property.


_AppDomain.SetData(String, Object)


The operation is attempted on an unloaded application domain.

Use this method to insert an entry, or modify the value of an entry in an internal cache of name-data pairs that describe properties of this instance of AppDomain.

The cache automatically contains predefined system entries that are inserted when the application domain is created. You cannot insert or modify system entries with this method. You can inspect their values with the GetData method, or the equivalent AppDomainSetup properties described in GetData.

You can insert or modify your own user defined name-data pairs with this method and inspect their values with the GetData method.

The following example demonstrates how to use the SetData(String, Object) method to create a new value pair. The example then uses the GetData method to retrieve the value, and displays it to the console.

using System;
using System.Reflection;

class ADGetData 
    public static void Main() 
        // appdomain setup information
        AppDomain currentDomain = AppDomain.CurrentDomain;

        //Create a new value pair for the appdomain
        currentDomain.SetData("ADVALUE", "Example value");

        //get the value specified in the setdata method
        Console.WriteLine("ADVALUE is: " + currentDomain.GetData("ADVALUE"));

        //get a system value specified at appdomainsetup
        Console.WriteLine("System value for loader optimization: {0}",

/* This code example produces the following output:

ADVALUE is: Example value
System value for loader optimization: NotSpecified

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.