function LetterUpperCase(event, flag,obj)//keypress

{

if (flag) {

var evt = event || window.event;

var nKeyCode = evt.keyCode || evt.which;

var sInput = obj.value;

if (nKeyCode >= 65 && nKeyCode <= 90) {

obj.value = sInput + String.fromCharCode(nKeyCode);

return false;

} else {

return true;

}

}

this.Attributes.Add("onkeydown", string.Format("return LetterUpperCase(event,{0},this);", this.UpperCase ? "true" : "false")); 会取消keypress事件

this.Attributes.Add("onkeydown", string.Format("LetterUpperCase(event,{0},this);", this.UpperCase ? "true" : "false")); 不会取消keypress事件