Adding items to List<T> using reflection

I was trying to add items to IList through reflection, but while calling the "Add" method an error was thrown "object ref. not set". While debugging I came to know that the GetMethod("Add") was returning a NULL reference.

Type objTyp = typeof(MyObject); //HardCoded TypeName for demo purpose
var IListRef = typeof (List<>);
Type[] IListParam = {objTyp};          
object Result = IListRef.MakeGenericType(IListParam);

MyObject objTemp = new MyObject(); 
Result.GetType().GetMethod("Add").Invoke(Result, new[] {objTemp });

Please help.