Databases
StackOverflow2013
Postsdbo
POFetch dropdownlist selected value upon click of a button
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POFetch dropdownlist selected value upon click of a button
    primarykey
    data
    text
    <p>On an ASP.net form, I have a button and a Dropdownlist. The Dropdownlist is populated through a LinqDatasource.</p> <p>I am trying to get the selected dropdownlist value upon click of a button.</p> <p>The dropdownlist gets the list of lastname from employees table of Northwind db.</p> <p>The code behind is like this which gets the ddl value as null</p> <p>aspx page</p> <pre><code> &lt;%@ Page Title="Home Page" Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Demo._Default" %&gt; &lt;form id="form1" runat="server"&gt; &lt;asp:DropDownList ID="Ddl_allGoldsets" runat="server" DataSourceID="LinqDataSource1" DataTextField="LastName" DataValueField="LastName"&gt; &lt;/asp:DropDownList&gt; &lt;asp:LinqDataSource ID="LinqDataSource1" runat="server" ContextTypeName="Demo.linqDataContext" EntityTypeName="" GroupBy="LastName" OrderGroupsBy="key" Select="new (key as LastName, it as Employees)" TableName="Employees"&gt; &lt;/asp:LinqDataSource&gt; &lt;asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /&gt; &lt;/form&gt; </code></pre> <p>codebehind</p> <pre><code>namespace Demo { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { linqDataContext dc = new linqDataContext(); DropDownList ddl = (DropDownList)Page.FindControl("Ddl_allGoldsets"); string val = ddl.SelectedValue; /* code that writes val into db*/ } } } </code></pre> <p>Above code returns null value into ddl!!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser219628
    1. USuser219628
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhat are you databinding to your ddl? Remove that line and your code will probably work.
      singulars
      1. POFetch dropdownlist selected value upon click of a button
      1. USBrad M
    2. COremoved the ddl.DataBind() line and still same error! thanks
      singulars
      1. POFetch dropdownlist selected value upon click of a button
      1. USuser219628
    3. COIs there anything databinded to your ddl in your postback?
      singulars
      1. POFetch dropdownlist selected value upon click of a button
      1. USBrad M
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload