Problem with RichTextBox DragDrop

[Sethuraman V]

Hello Everybody,

I have a rich text box in which i have to drop a custom
object (user defined object). When i drop a string into
the richtextbox control, everything goes fine but if i
drop a custom object, the value of the object becomes null.

I am very much confused.

Kindly help me out in this regard.

Following is a sample of the code:

if (e.Data.GetDataPresent(typeof(string)))
{
string s = (string) e.Data.GetData(typeof(string));
rtb.SelectedText = s;
}
else if (e.Data.GetDataPresent(typeof(Class1)))
{
Console.WriteLine(sender.ToString());
Class1 c1 = (Class1)e.Data.GetData(typeof(Class1));
if (c1 == null)
{
MessageBox.Show("null");
}
else
{
rtb.SelectedText = c1.Name + " 123";
}
//rtb.SelectedText = Class1.ss + " 123";
}

NOTE: Class1 is a user-defined class which has a
property 'Name'.
I cannot drop 'Name' directly as string because i use the
object in another control.

Here if i drop the object Class1, always MessageBox "null"
is displayed.

Am i doing any mistake here? is there any work-around for
this?

Regards.

Sethuraman V