textbox default button

javascript:



function clickButton(e, buttonid){

var evt = e ? e : window.event;

var bt = document.getElementById(buttonid);

if (bt){

if (evt.keyCode == 13){

bt.click();

return false;

}

}

}



TextBox1.Attributes.Add("onkeypress", "return clickButton(event,'" + Button1.ClientID + "')");