how to load the user control dynamically??

What type of application?

In web forms (in the context of an executing page), you'd do something like this:

MyUserControl objControl;
objControl = (MyUserControl)this.LoadControl("MyUserControl.asc x");

Then you can add the control to the page or to a placeholder, etc.:

plcAPlaceholder.Controls.Add(objControl);

-Peter

well i want to load the control in C#.