You can do this a different way by Func<T>
and closures:
public T Execute<T>(Func<T> method)
{
// stuff
return method();
}
The caller can then use closures to implement it:
var result = yourClassInstance.Execute(() => SomeMethod(arg1, arg2, arg3));
The advantage here is that you allow the compiler to do the hard work for you, and the method calls and return value are all type safe, provide intellisense, etc.