How to find drop down List select value at selected index change

Question

4.00/5 (1 vote)

See more:

Hello all,

I have a datalist.Inside it has two dropdowns. On the selected index of first dropdown I want to bind the second drop down.for that i have to need the selected value of first drop down.How it will be done bcz i am not getting the selected value of first drop down.

code at selected index

 DropDownList ddlcountry= (DropDownList)DataList1.FindControl("ddlcountry");
int id=convert.toint32(ddlcountry.selectedvalue);

but it shows null at ddlcountry.

Thanks & Regards,
amit

Posted 22-Mar-11 7:35am

amit2620

Updated 22-Mar-11 7:39am

Wendelius

v2

Add a Solution

Comments

Wendelius 22-Mar-11 13:40pm

Pre and code tags added

Orcun Iyigun 22-Mar-11 13:49pm

Maybe cascading dropdown will work for you?

http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/CascadingDropDown/CascadingDropDown.aspx

http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/Walkthrough/CCDWithDB.aspx

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

walterhevedeich · Answer 1 · 2011-03-22T08:04:00

Solution 1

You dont find the control on the DataList itself. You do it on every DataListItem of the DataList. Refer to the code below:

(DropDownList)DataList1.Items[0].FindControl("ddlcountry");

Posted 22-Mar-11 8:04am

walterhevedeich

Shahriar Iqbal Chowdhury/Galib · Answer 2 · 2011-03-22T10:23:00

hi,
FindControl needs to know which Item it is looking in because a
DataList contains many copies of each control that is in a template.You need to iterate all items in DataList to find the dropdown and manipulate them, you can use the code below,

C#

foreach(DataListItem dlistItem in DataList1.Items)
{
   DropDownList ddlcountry=  dlistItem.item[i].
                findControl("ddlcountry") as DropDownList;
   if(ddlcountry!=null)
   {
     int id=Convert.ToInt32(ddlcountry.SelectedValue);
   }

}

Hope this will help.