提取和在数据库中插入数据期间Dropdownlist中的问题 [英] Problem in Dropdownlist During Fetch and insert data in database

问题描述

我想在Datbase中插入一些数据，我需要四个字段，两个下拉列表和两个文本框，
当我将数据保存到数据库中时，提交按钮后，这会生成一条错误消息.即

I Want to Insert Some data into Datbase, i take four field two dropdownlist and two textbox,
when i save data in database, after submit the button , this genrate an error message. that is

'proDropDownList1' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value

而我的下拉列表代码是-

and my dropdownlist code is -

<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" Width="161px">

推荐答案

在访问dropdownlist.selectedvale之前将数据绑定到dropdownlist.
首先查看您的下拉列表中是否有项目.

bind data to dropdownlist before u r accessing dropdownlist.selectedvale.
first see whether u r dropdownlist has items or not.

突出显示功能
http://support.microsoft.com/kb/181440 [ http://msdn.microsoft.com/en-us/library/ms171644开始. aspx [ ^ ]或在C#中用户可搜索的TextBox，RichTextBox，ListView和TreeView [

Highlight functionality
http://support.microsoft.com/kb/181440[^] - an old link but useful if you are using the ListView in report mode.

Search functionality
Doing a search on the internet will give you tons of results for this.

However, you can start with http://msdn.microsoft.com/en-us/library/ms171644.aspx[^] or A User-Searchable TextBox, RichTextBox, ListView, and TreeView in C#[^].

http://www.w3schools.com/aspnet/aspnet_examples.asp
use this for reference

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