asp.net中的dropdownlist问题 [英] problem with dropdownlist in asp.net

问题描述

我有一个项目，我希望如果用户在下拉列表中选择一个值..它必须显示在标签中但是 onselectedindexchanged 方法不会触发值但是如果我点击任何按钮出现在同一页面，然后价值显示在标签中..



欲望输出是 onselectedindexchanged 必须触发自己的价值



这里'是我的代码

i have a project where i want that if a user selects a value in the dropdownlist .. it must be shown in the label but the onselectedindexchanged method is not firing the values but if i click on any button present the same page then the value is being shown in the label..

the desire output is that the onselectedindexchanged must fire the value on its own

here''s my code

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{

    string sdr= dropdownlist1.selectedvalue;
    label1.text= "Hi"+sdr;

 }

任何帮助表示赞赏。



thnk u

any help is appreciated.

Thnk u

推荐答案

将 AutoPostBack 的标记设置为true。

Set the tag of AutoPostBack to true.

AutoPostBack="true"

将解决问题。



祝你好运，

OI

will solve the issue.

Good luck,
OI

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