exception Invalid Cast Exception : Specified cast is not valid

[arunkumar]

The below mentioend C# code snippnet will be executed while loading an usercontrol at its design time, but it throws an exception Invalid Cast Exception : Specified cast is not valid
while executing this line
Screen screen = Activator.CreateInstance(type,null ) as Screen ;

however, the same code is executing properly when it is deployed as run time.

can anybody help me out to resolve this problem ?

string asmName = listBox3.SelectedItem.ToString ();
Assembly asm = (Assembly) asmList[asmName];
listBox4.Items.Clear ();

foreach(Type type in asm.GetTypes())
{
if(type.IsClass && type.IsSubclassOf(typeof(Screen)))
{
Screen screen = Activator.CreateInstance(type,null ) as Screen ; // this line thrown an exception

if(!classList.Contains (type.Name ))
classList.Add (type.Name, screen);
else
classList[type.Name] = screen;

[Pop Catalin]

just try using other overload of the CreateInstance Method
try
System.Activator.CreateInstance(System.Type type)

>The below mentioend C# code snippnet will be executed while loading an usercontrol at its design time, but it throws an exception Invalid Cast Exception : Specified cast is not valid
>while executing this line
>Screen screen = Activator.CreateInstance(type,null ) as Screen ;
>
>however, the same code is executing properly when it is deployed as run time.
>
>can anybody help me out to resolve this problem ?
>
>string asmName = listBox3.SelectedItem.ToString ();
>Assembly asm = (Assembly) asmList[asmName];
>listBox4.Items.Clear ();
>
>foreach(Type type in asm.GetTypes())
>{
>if(type.IsClass && type.IsSubclassOf(typeof(Screen)))
> {
>Screen screen = Activator.CreateInstance(type,null ) as Screen ; // this line thrown an exception
>
>if(!classList.Contains (type.Name ))
> classList.Add (type.Name, screen);
>else
> classList[type.Name] = screen;
>