Examples with TextBox & Button& Lable Controls:

• Create a New WebPage
• Goto ToolBox
• DoubleClick on TextBox
• This will create TextBox1
• Select TextBox1
• Goto Properties Window
• Change the ID to txtSample (Name in C#.Net (ID) in Asp.Net) 
• Goto ToolBox
• DoubleClick on Button
• This will create Button1
• Select Button1
• Goto Properties Window
• Change the Text Property to Red,Change ID to btnRed
• Similarly for Reamining TwoButtons. 

Design:-

Select the Button btnRed ---- Go to properties window---- Click on Events  Button---- Go to click Event, double click on it ---- write the following code

 

protected void btnRed_Click(object sender, EventArgs e) {             txtSample.BackColor = System.Drawing.Color.Red; }

Select the Button btnGreen ---- Go to properties window ----Click on Events Button, double click on click Event ---- Write the following code

protected void btnGreen_Click(object sender, EventArgs e) {         txtSample.BackColor = System.Drawing.Color.Green; }

Select the Button btnBlue----Go to properties window ---- Click on Event Button, double click on click Event ---- Write the following code

protected void btnBlue_Click(object sender, EventArgs e) {         txtSample.BackColor = System.Drawing.Color.Blue; }

  Run the Webpage & Check

Example to Perform Addition,Subtraction,Multiplication,Division of Two Numbers.

Create a NewPage,Design the WebPage  like

Generate the Button Click Events of btnAdd,btnSubtract,btnMultiply,btnSubtract

Write the Following code

public partial class ASMDExample : System.Web.UI.Page {     int A, B, C;     protected void Page_Load(object sender, EventArgs e)     {            }     protected void btnAdd_Click(object sender, EventArgs e)     {         A = Convert.ToInt32(txtNum1.Text);         B = Convert.ToInt32(txtNum2.Text);         C = A + B;         txtResult.Text = C.ToString();     }     protected void btnSubtract_Click(object sender, EventArgs e)     {         A = Convert.ToInt32(txtNum1.Text);         B = Convert.ToInt32(txtNum2.Text);         C = A - B;         txtResult.Text = C.ToString();     }     protected void btnMultiply_Click(object sender, EventArgs e)     {         A = Convert.ToInt32(txtNum1.Text);         B = Convert.ToInt32(txtNum2.Text);         C = A * B;         txtResult.Text = C.ToString();     }     protected void btnDivide_Click(object sender, EventArgs e)     {         A = Convert.ToInt32(txtNum1.Text);         B = Convert.ToInt32(txtNum2.Text);         C = A / B;         txtResult.Text = C.ToString();     } }

 Run the WebPage & Check