OOP Add two numbers using C#.net

In this tutorials will  teach you how to add two number using OOP concepts. This is an important for developing a c# projects.  there are many students who struggling with this area. so that I bring this article for all to clear the doubts.

First You have to Design the Form

After that you have to create the class  Cal.cs

   class Cal
    {
        public int num1, num2,tot;
        public int Add()
        {
            tot = num1 + num2;
            return tot;
        }
    }

Paste the Code inside the Add Button

Cal c = new Cal();
c.num1 = int.Parse(txtNum1.Text);
c.num2 = int.Parse(txtNum2.Text);

label3.Text = c.Add().ToString();