using System;

public class BaseClass{

 public virtual void Hello(){

   Console.WriteLine("BaseClass method");

 }

}

​

public class MyClass : BaseClass{

 public MyClass(string param1,string param2){}

 public override void Hello(){

   Console.WriteLine("MyClass method");

 }

}

​

public static class Program{

  public static T DoSomething<T>(object param1,object param2) where T:BaseClass{

​

    // Instance it and cast to T:

    T obj=(T)Activator.CreateInstance(typeof(T),param1,param2);

​

    // Do anything else with obj.

    // Return it:

    return obj;

  } 

  public static void Main(){

    MyClass myClass=DoSomething<MyClass>("param1","param2");

    myClass.Hello();

  } 

}