Focusing on a TextBox in C#

private void checkBox_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Focus();
}

Hi Ramakrishna,
Please ask the question more understandable.I think your requirement is to set the cursor on a specific textbox after clicking the checkbox.For doing this, Add the event handler for Click event of check box and call the textbox's Focus event inside the event handler

private void checkBox1_Click(object sender, EventArgs e)
   {
     urTextboxName.Focus();
   }

Vineeth