You could try to instantiate the class with reflection ... it won't crash if it doesn't exist, it will just return a null:

string DLLName = "MyDLL.dll";
string ClassName = "MyDll.MyClass";
System.Reflection.Assembly oDLL;
object oClass;

// This "loads" the .DLL
oDLL = System.Reflection.Assembly.LoadFrom(DLLName);

// This creates the class instance
oClass = oDLL.CreateInstance(ClassName);

if (oClass != null)
{
    // the class exists
}

~~Bonnie



>Hi,
>I have code to add control to form dynamically during runtime. Before that, how could I check whether the particular control is already exist or not?
>
>Thank you