Solved

Looping through a datalist control

Posted on 2006-06-22
2
873 Views
Last Modified: 2008-06-14
I am trying to loop through a datalist control (asp.net 2.0) and get the selected values.  Each time this code runs, I get this error:

"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index"

It highlights this line: int key = (int)this.dlstDemoList.DataKeys[item.ItemIndex];



Here's the code:


                foreach (DataListItem item in dlstDemoList.Items)
                {
                    int key = (int)this.dlstDemoList.DataKeys[item.ItemIndex];
                    // Do something with the value of key

                    // Select the sales rep assigned to this demo.
                    DropDownList ddl = item.FindControl("ddlSalesReps") as DropDownList;
                    string keyd = ((HtmlInputControl)item.FindControl("Sales_Rep_ID")).Value;
                    ddl.SelectedValue = keyd;
                }

This ran perfectly before I moved it to a different page.  It originally ran on ASP.NET 1.1, but now is 2.0 - so I wonder if the control is a little different or something.  Regardless, there are several values that are displayed in this list.

Thank you,

STank
0
Comment
Question by:stankstank
[X]
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
2 Comments
 
LVL 5

Accepted Solution

by:
vinodhsomasekharan earned 500 total points
ID: 16966319
Hai

DataKeys() collection is populated only if u assign the DataKeyfield property while binding the grid

ie dlstDemoList.DataKeyField = "ID" .. before binding the grid..

but in u r code.. u r binding the grid in the page_load event..u r using the funtion

        dlstDemoList.DataSource = DataSet1
        dlstDemoList.DataBind()


but u have not set the DataKeyField value here..
so try the code dlstDemoList.DataKeyField = "ID"  in the bindgrid funtion before DataBind()

dlstDemoList.DataKeyField = "Give u r key field name"


hope this helps

Regards
Vinodh
0
 

Author Comment

by:stankstank
ID: 16968249
Ahh, that's it.  Makes perfect sense.  When I changed this code to another page, I didn't give it the datakey field.  Thanks a  million!  I would have still been looking for the answer. :)

Stank
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering 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

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

735 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