dropDownList selectedIndex return 0 always

Question

1.00/5 (1 vote)

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Hello Everyone,

Page Structure
Page -> Place Holder -> web User control -> Dropdownlists

This is my Page Elements. There is click event to generate new webUserControl and place it onto PlaceHolder.
Now my Problem is that
I have three Dropdownlist inside webUserControl
and all values of dropdownlist populates from xml files.

Here is some Images to clarify my Problem
"All are inside WebUserControl which will created dynamically on the occurance of Click event"

1) suppose this is my first Drop down list -> i) DropdownlList

2) Now suppose I am selected "verb" option from dropdownlist1 automatically other dropdownlist2 will be visible and populates items in it according to dropdownlist1 selection

3) **Now main Problem starts here, **
when I am clicked on "Auxiliary" option, I am supposed to get index of Auxiliary text. It is 3. but it always returns index 0

this dropDownList does not hold the selected value.

Please give suggesions to resolve this problem.
Thanking you

Posted 11-Apr-13 0:36am

Rohit More

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Comments

CHill60 11-Apr-13 6:44am

Sounds similar to an issue I had where the page was refreshing before I captured the selectedIndex - if I recall I had to check Page.IsPostBack

vinodkumarnie 14-Apr-13 13:08pm

Can you share your source code..?

3 solutions

Solution 1

The problem is you are filling your 1st drop-down list in form load and every time some event happens it loads the form i guess u have not kept update panel so again it fills your first drop down and causes selected index changed event to fire which makes your dropdown2 selected index 0 again and again.

so my suggestion is you keep filling of your first drop down as following in form load

C#

if(!IsPostback) then
//fill your drop-down 1 here
end if

i guess it helps you

Posted 11-Apr-13 0:46am

Raj Parashar

Updated 14-Apr-13 6:23am

v2

Solution 3

use

If Not IsPostBack Then

' here do u dropdown data bind work

End If

Posted 15-Apr-13 0:23am

babu saravanan

Comments

fjdiewornncalwe 15-Apr-13 9:15am

Please read the other answers before reposting what is already stated in an existing one.

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Rohit More · Accepted Answer · 2013-04-18T23:32:00

Thank you so much to all.
Mr. Raj Sir You are absolutely right. controls getting refresh on each page load event.
even I applied update panel in my web use control but no use.

Mr. Babu Sir, Sorry but It will not work for my control.

I have solved my problem.

Actually , as I said I am creating my dynamic control in the occurrence of click event and placed in place holder.
and placeholder clears on each postback and then again load then web User Control. Due to this dropdownlist2 which dependent on dropdownlist1 gets refresh and cleared all values.

Solution :
write OnInit () method and inside that call function for filling up the values of dropdownlist1.
Postback cant reflects on dropdownlist1.

It works fine.

thanking you sir