Example with Textbox Label,Button:-

Add a new Form i.e.,FormArithematic to the Windows Application WABasics

Create three labels,three textboxes and four buttons & set the following properties to them

label1:      Text    : Enter First Number:      Name  : lblNum1 label2:      Text  : Enter Second Number:      Name: lblNum2 label3:      Text   : Result:      Name : lblResult

textbox1:      Name: txtNum1 textbox2:      Name: txtNum2 textbox3:      Name : txtResult      ReadOnly: True

button1:      Name: btnAdd      Text: + button2:      Name: btnSubtract      Text: - button3:      Name : btnMultiply      Text    : * button4:      Name  : btnDivide      Text    : /

Design :-

Generate the functions for btnAdd ,btnSubtract,btnMultiply,btnDevide Click Events

& write the following code in Source[FormArithematic.cs] 

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WABasics {     public partial class FormArithematic : Form     {         int a, b, c;         public FormArithematic()         {             InitializeComponent();         }         private void btnAdd_Click(object sender, EventArgs e)         {             a = Convert.ToInt32(txtNum1.Text);             b = Convert.ToInt32(txtNum2.Text);             c = a + b;             txtResult.Text = c.ToString();         }         private void btnSubstract_Click(object sender, EventArgs e)         {             a = Convert.ToInt32(txtNum1.Text);             b = Convert.ToInt32(txtNum2.Text);             c = a - b;             txtResult.Text = c.ToString();         }         private void btnMultiply_Click(object sender, EventArgs e)         {             a = Convert.ToInt32(txtNum1.Text);             b = Convert.ToInt32(txtNum2.Text);             c = a * b;             txtResult.Text = c.ToString();         }         private void Divide_Click(object sender, EventArgs e)         {             a = Convert.ToInt32(txtNum1.Text);             b=Convert.ToInt32(txtNum2.Text);             if (b == 0)                 MessageBox.Show("Second Number Cannot be Zero");             else             {                 c = a / b;                 txtResult.Text = c.ToString();             }         }           } }

Result :-