Activator.CreateInstanceFrom Method (AppDomain, String, String)

Note: This method is new in the .NET Framework version 2.0.

Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly file and default constructor.

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

public static ObjectHandle CreateInstanceFrom (
	AppDomain domain,
	string assemblyFile,
	string typeName
public static ObjectHandle CreateInstanceFrom (
	AppDomain domain, 
	String assemblyFile, 
	String typeName
public static function CreateInstanceFrom (
	domain : AppDomain, 
	assemblyFile : String, 
	typeName : String
) : ObjectHandle



The remote domain where the type named typeName is created.


The name of a file that contains an assembly where the type named typeName is sought.


The name of the preferred type.

Return Value

A handle that must be unwrapped to access the newly created instance.

Exception typeCondition


domain or typeName is a null reference (Nothing in Visual Basic).


No matching public constructor was found.


typename was not found in assemblyFile.


assemblyFile was not found.


The caller does not have permission to call this constructor.


Cannot create an instance of an abstract class or this member was invoked with a late-binding mechanism.


The constructor, which was invoked through reflection, threw an exception.


The caller does have the required FileIOPermission.

Use CreateInstanceFrom when a host needs to execute code in an AppDomain with restricted security permissions.

Use the ObjectHandle.Unwrap method to unwrap the return value.


This method uses SecurityAction.LinkDemand to require the immediate caller to have full trust. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

For information about other exceptions that can be thrown by invoked methods, see the Exceptions section of the Assembly.LoadFrom and CreateInstance methods.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

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