How To Add User Controls For Addition And Subtraction In Windows.Forms

Let us learn how to create a Windows.Forms application for addition and subtraction.
Step 1
Create a new Windows.Forms project. 

Add a form into the project.

Add panel and buttons for addition and subtraction.

Step 2

Create user controls for addition.


Step 3

Create an instance of user control in its cs file.
  1. private static Addition _instance;  
  2. public static Addition instance {  
  3.     get {  
  4.         if (_instance == null) _instance = new Addition();  
  5.         return _instance;  
  6.     }  
  7. }  
Step 4

Call that instance in your form on button click.
  1. private void Add_Click(object sender, EventArgs e) {  
  2.     panel1.Visible = true;  
  3.     panel1.Controls.Add(Addition.instance);  
  4.     Addition.instance.Dock = DockStyle.Fill;  
  5.     Addition.instance.BringToFront();  
  6. }  
Step 5

Similarly, do it for subtraction

Now, rebuild your project.
Hence your Windows Form is ready with addition and subtraction user controls.