Add all to dropdownlist with datasource

Posted on 2008-10-04
Last Modified: 2012-08-14
I have a dropdownlist that is bound linqdatasource. The dropdownlist is used to only contacts based on a job type that is selected in the dropdown. It works perfectly, however, there are instances where the user wants an all option to display all contacts no matter what their job type. How do I add this and still use the datasource?
Question by:johnywhite
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 16

Expert Comment

ID: 22642153
Can you post the code that you're using to bind the drop down list?

Author Comment

ID: 22642241

                    <asp:DropDownList ID="ddlSortBy" runat="server" 
                        onselectedindexchanged="ddlSortBy_SelectedIndexChanged" AutoPostBack="True" 
                        DataSourceID="datasourceCrafts" DataTextField="Craft" DataValueField="ID">
                    <asp:LinqDataSource ID="datasourceCrafts" runat="server" 
                        ContextTypeName="MDataClassesDataContext" OrderBy="Craft" 

Open in new window


Expert Comment

ID: 22642362
please post the code-behind page ...
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.


Author Comment

ID: 22642417
There is no code behind at this point. That is exactly how the data is bound to the control.

Author Comment

ID: 22642423
The only code-behind that exists at this point in the project is the empty method:
  protected void ddlSortBy_SelectedIndexChanged(object sender, EventArgs e)
LVL 26

Expert Comment

by:Anurag Thakur
ID: 22642450
If there is a Query selecting the JobType from the JobType table then modify it as follows

Select 'Text' = 'All', Valaue = '-1'
Union All
Select 'Text' = JobTypeName, 'Value' = JobID From JobTypeTable


Author Comment

ID: 22642452
No there is no query. This is a linqdatasource the connects directly to the tables.

Author Comment

ID: 22953835
I found the solution myself. If anyone finds this in the future here it is:
    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
        If Not IsPostBack Then

            Dim dc As New QSSDataContext
            Dim Emps = (From s In dc.Shifts Where s.Employee.inActive Is Nothing OrElse s.Employee.inActive = False Select New With {, s.sid} Distinct)

            ddlSortBy.DataSource = Emps.OrderBy(Function(em)
            ddlSortBy.DataTextField = "name"
            ddlSortBy.DataValueField = "sid"
            ddlSortBy.Items.Insert(0, "All Employees")

        End If
    End Sub

Accepted Solution

Computer101 earned 0 total points
ID: 22981140
PAQed with points refunded (500)

EE Admin

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article shows how to use the open source plupload control to upload multiple images. The images are resized on the client side before uploading and the upload is done in chunks. Background I had to provide a way for user…
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question