title: How to insert checkbox checked value to textbox without autopostback
body: <p>I have unlimited asp.net checkboxes  to my webpage .How to insert checkbox checked value to textbox without autopostback.</p>
  
  <p>I i check checkbox1 and checkbox2 then in textbox it appear as 1,2 ...and after when i uncheck checkbox1 then in textbox the value would be 2.</p>
  
  <h2>and if i uncheck checkbox1 and checkbox2 then value in textbox is blank</h2>