Question

I have two pages in a tab control, i wanted to restrict access to page to when check box is checked,please any one tell me how to do it in windows form application in c#.

Answer 1

So we have this event ‘Selecting’ in the tabControl
As MSDN docs states you could prevent the tabpage change in this event verifying the Checked property of you checkbox

private void TabControl1_Selecting(Object sender, TabControlCancelEventArgs e) 
{
    if(checkBox1.Checked == true)
        e.Cancel = true;
}