How to load other form in C#

I am new user in C#. Actually I am developing a project in C# and I don't know how to load other form which I have added manually by right click and add item. I have used following code but it is useless for me though its working.
//Form form2 = new Form();
//form2.show();
as this code create run time form and for how can I add various tools such as textbox, button etc.... in new run time form.
Please reply If anyone knows the answer for above question.
Thanks.....