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AppDomain.CreateInstanceFromAndUnwrap Method (String, String)

Creates a new instance of the specified type defined in the specified assembly file.

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

public Object CreateInstanceFromAndUnwrap (
	string assemblyName,
	string typeName
public Object CreateInstanceFromAndUnwrap (
	String assemblyName, 
	String typeName
public function CreateInstanceFromAndUnwrap (
	assemblyName : String, 
	typeName : String
) : Object



The file name and path of the assembly that defines the requested type.


The fully qualified name of the requested type, including the namespace but not the assembly, as returned by the Type.FullName property.

Return Value

The requested object, or a null reference (Nothing in Visual Basic) if typeName is not found.

Exception typeCondition


assemblyName is a null reference (Nothing in Visual Basic).


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


Operations are attempted on an unloaded application domain.


assemblyName was not found.


typeName was not found in assemblyName.


No parameterless public constructor was found.


The caller does not have sufficient permission to call this constructor.


assemblyName is not a valid assembly.


An assembly or module was loaded twice with two different evidences.

This is a convenience method that combines CreateInstanceFrom and ObjectHandle.Unwrap. This method calls the default constructor for typeName.

For more information, see the Activator.CreateInstanceFrom method.

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, 1.1, 1.0