DropDownList“具有一个无效的SelectedValue，因为它在项目列表中不存在” [英] DropDownList “has a SelectedValue which is invalid because it does not exist in the list of items"

问题描述

我收到一个错误，上面写着：



DropDownList有一个无效的SelectedValue，因为它在项目列表中不存在



我很确定我的DataValueField是正确的。

I''m getting an error with this one that says:

DropDownList "has a SelectedValue which is invalid because it does not exist in the list of items"

I''m quite sure that my DataValueField is correct.

locList.DataSource = ds;
locList.DataTextField = Property.NameColumn;
locList.DataValueField = Property.IdColumn;
locList.DataBind();

推荐答案

locList.DataSource = ds.Tables[0];//assign table not dataset
    locList.DataTextField = Property.NameColumn;//make sure you have write column names properly
    locList.DataValueField = Property.IdColumn;
    locList.DataBind();

快乐编码！

：）

Happy Coding!
:)

使用以下

use following

if (!IsPostBack)
          {

        locList.DataSource = ds.Tables[0];
	locList.DataTextField = Property.NameColumn;
	locList.DataValueField = Property.IdColumn;
	locList.DataBind();

          }

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