CHECKBOX

CheckBox
event - True or False

Activity:

1. Event Activity
2. Listener Activity
3. Perform Activity     

On Event for listen and perform make AutoPostBack as True

     AutoPostBack = true

Step:

1. Click on CheckBox.
2. Make AutoPostBack = True of CheckBox.
3. Write code on Checkbox.

code on CheckBox1 and print in TextBox1.Text when checked:


  protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        if (CheckBox1.Checked == true)
        {
            TextBox1.Text = "Red";
         
        }
        else
        {
            TextBox1.Text = "";
        }
    }

Design

CheckBox1
TextBox1.Text