我希望在下拉列表的Indexchanged / Itemchanged事件中调用特定函数，实际上我试过但它不起作用 [英] I Wish To Call A Specific Function On Indexchanged/Itemchanged Event Of Drop Down List ,In Fact I Tried But Its Not Working

问题描述

我的代码如下：

my code is as bellow

public void searchFor_Company()
        {
            using (MySqlConnection con = new MySqlConnection(CS))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    cmd.CommandText = "select AddressId from companyaddress where CompanyName='"+drp_CompName.SelectedItem.Text.Trim()+"'";
                    cmd.Connection = con;
                    con.Open();
                    MySqlDataReader dr = cmd.ExecuteReader();
                    dr.Read();
                    txt_CompanyId.Text = dr[0].ToString();
                    con.Close();
                }
            }
        }

        protected void drp_CompName_SelectedItemChanged(object sender, EventArgs e)
        {
            searchFor_Company();
        }

        protected void drp_CompName_SelectedIndexChanged(object sender, EventArgs e)
        {
            searchFor_Company();
        }

但它没有工作所以需要帮助，我想使用DropDownList的哪个事件？

在此先感谢。 ............）

but its not working so need help,which event of DropDownList i suppose to Use??
Thanks In Advance............:)

推荐答案

无法在任何事件（Indexchanged / Itemchanged）下调用任何引用控件上某些更改的函数值/文本如'txt_CompanyId.Text等..'



还要确保你对相应的下拉列表使用AutoPostBack =true。

Can't call any function under any event(Indexchanged/Itemchanged) which refer some changes on control value/text like 'txt_CompanyId.Text etc..'

Also make sure you're using AutoPostBack="true" against respective dropdown list.

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