javascript语言弹出提示输入不能为空
我用的vs2005里的textbox控件，怎么样才能办到呢？？我在网上搜的全是input（text）的控件啊，input控件又不知道该怎么把数据从里面提取出来，大家帮帮忙啊，尽量沾出代码啊，

[解决办法]
其实微软很多时候是把js脚本封装成服务器脚本,我们也可以如法炮制:

C# code

public static class JSHelper {    public static void Alert(string pValue) {        pValue = MyHelper.ToString(pValue);        string _s = "alert('" + pValue + "');";        JSHelper.Execute(_s);        }    public static void Execute(string pKey, string pjsString) {        string _jsString = MyHelper.ToString(pjsString);        string _Key = MyHelper.ToString(pKey);        Page _thisPage = (Page)HttpContext.Current.Handler;        ScriptManager.RegisterStartupScript(_thisPage, _thisPage.GetType(), _Key, _jsString, true);        }    public static void Execute(string pjsString) {        JSHelper.Execute(MyHelper.ToString(Guid.NewGuid()), pjsString);        }    public static void SetFocus(string pClientId) {        pClientId = MyHelper.ToString(pClientId);        MyHelper.Assert(pClientId != "", new ArgumentException("参数pClientId不允许为空"));        string _s = "var _focus = document.getElementById('" + pClientId + "');";        _s += "if(_focus)_focus.focus();";        JSHelper.Execute(Guid.NewGuid().ToString(), _s);        }