Use JQuery To Bind value in Another Text Box
<input type="checkbox" id="similaradd" />Similar To Above
<input type="text" id="txt1" />
<input type="text" id="txt2" />
$("#similaradd").click(function (event) {
val text1 = $("#txt1").val();
if(this.checked)
{
$("txt2").val(text1);
}
else
{
$("txt2").val("");
}
});