ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

You may receive the error "Cannot have multiple items selected in a DropDownList." when trying to set a value selected in an ASP.NET Dropdownlist.

This error specifically occurs if you are trying to execute a similar code as follows:-



DropDownList1.Items.FindByValue("3").Selected = true;

(or)

DropDownList1.Items.FindByText("Sports").Selected = true;

This error doesnt occur if you try to use

DropDownList1.SelectedIndex = 3;
or
DropDownList1.SelectedItem.Value = "3"; (Wrong way of implementation. But people use this)


The resolution is that, you just have to mention DropDownList1.ClearSelection(); before using D
ropDownList1.Items.FindByValue("3").Selected = true;

The correct step is as below:-

DropDownList1.ClearSelection();
DropDownList1.Items.FindByValue("3").Selected = true;

or

DropDownList1.ClearSelection();
DropDownList1.Items.FindByText("Sports").Selected = true;

In my next article I will discuss on the common misconception in making a particular Dropdownlist value selected.

Cheers and Happy Programming !!!

Print | posted on Wednesday, May 3, 2006 9:00 AM

Comments on this post

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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this info was very useful to me

thanks for ur information
Left by john michel on Feb 27, 2007 11:05 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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cheers been bugging me that one!
Left by Lee Stevens on Mar 01, 2007 3:58 PM

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That solved a baffling error for me. Thanks!
Left by Bill Kuhn on Mar 09, 2007 9:09 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks!!! You saved a food few hours!!!!
Left by Ramy on Nov 28, 2007 8:09 AM

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Thanks,
We searched for that problem on Google and found at top. Nice Solution.
Good work,
Keep it up :)
Left by Shail on Dec 12, 2007 1:41 AM

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This article was very useful to me and it is easily understandable
Left by Praveena on Dec 17, 2007 5:20 PM

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Nice one. Saved my time. Cheers mate.
Left by Hitz on Feb 13, 2008 9:58 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks. It helped me a lot.

Regards,
Shaik.
Left by Shaik on Feb 18, 2008 6:12 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks..... i got an idea ....but what about it comes in master page not using FindByValue or text
Left by Sankar on Feb 25, 2008 4:22 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Ekdam Rapchik ha!
Left by Eknath on Feb 28, 2008 4:24 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Straight forward solution thnx
Left by Sfinx on Mar 10, 2008 3:04 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks For The Help!! God Bless!
Left by rishian on Apr 02, 2008 4:48 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks very much for the solution!
Left by carlos on May 05, 2008 4:19 AM

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thanks for the help
Left by abhishek on May 08, 2008 10:56 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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i had spend almost 3-4 hours to this error. After that the solution you had given, solved my problem
Thank you very much
Left by Ravi Gupta on May 09, 2008 5:07 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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tnks you saved some debugging ours for me!!
Left by Ashberger on May 22, 2008 7:57 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thank you so much..this is really useful.....
Left by Kalaravi on Jun 20, 2008 12:43 AM

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thanks a lot nice solution
Left by sivaani on Jun 30, 2008 9:56 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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this saved a lot of time for me !!! nice post
Left by Subhash on Jul 07, 2008 5:41 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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got my problem solved in seconds.
Left by Ashish on Jul 15, 2008 8:26 PM

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thank for good article
Left by chan myie on Jul 29, 2008 7:43 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thank you,got my problem solved in seconds.
Left by Sunitha on Aug 10, 2008 4:38 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thank you very much
Left by Shailesh on Aug 27, 2008 12:33 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks a lot for the information. It was very useful!
Left by Pradeep on Sep 20, 2008 4:39 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks a lot. This is a great piece of information.
Left by Mohit on Oct 05, 2008 10:22 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thank u it helped me...
Left by NIkeeta on Oct 30, 2008 6:36 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thnx, very useful as well! :o)
Left by Larrr on Nov 03, 2008 2:48 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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I tried this.. but i am getting another Error:

Object reference Not set to an instance of an Object

Pls help
Left by Naved on Nov 04, 2008 12:13 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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haa.. thank u... saved a lot of time...in debugging..
Left by kaaki on Nov 06, 2008 1:39 AM

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To avoid "Object reference Not set to an instance of an Object":

DropDownList1.ClearSelection()

dim li as listitem = DropDownList1.Items.FindByValue(3)

if li isnot nothing then
li.selected = true
end if
Left by Just a VB Guy on Nov 22, 2008 1:58 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Hi
Another possibility is that you are using the same listItem instance multiple times. In my code I was declaring one ListItem:

ListItem listItemSelect = new ListItem("Select", "0");

and adding this to multiple dynamicly created dropdowns. If no selection is made on more than one dropwdown and the page is posted back, and you re-create the dropdowns then the listitem above is the selected item for those dropdowns - thus causing the same error.

So you don't necessarily have to clear the selection - first ensure you're not using the same listitem in multiple dropdowns.
Left by MarkJaL on Nov 26, 2008 5:18 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Fantastic!!

Worked a treat, thanks!!
Left by Cheryl on Dec 11, 2008 3:26 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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This article greatly solved the problem which I was facing. Thanks a lot
Left by Vijaycanaan on Dec 12, 2008 12:51 PM

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A gr8 help for me!!!!! Thanks
Left by Snehal on Jan 16, 2009 4:18 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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thansk a lot it saved me a lot of time
Left by Rama charan on Jan 20, 2009 4:54 PM

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Didn't work for me until I read the comment posted by MarkJal. Was using the same listItem instance in multiple dropdowns. Very helpful.

Thanks, saved me a lot of time and trouble.
Left by erwin on Feb 05, 2009 5:12 AM

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Thank u so much :) it solved my problem i was struggling with too long. Yes it was a top link on google. Thanks again
Left by Gurdeep Singh on Apr 13, 2009 10:00 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thank u so much :) it solved my problem i was struggling with too long. Yes it was a top link on google. Thanks again
Left by Sandeep Tanwer on Apr 15, 2009 9:56 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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U R D Man! Thanks!
Left by Gowtham on Apr 24, 2009 2:51 AM

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Strangely, this did not fix the problem for me:

The code I am using is:

ddState.ClearSelection();
ddState.Items.FindByValue("NM").Selected=true;

Thanks,
Dave

Left by Dave on May 01, 2009 2:44 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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I found the solution for my delimna:

http://sebastienlachance.com/2008/03/08/cannot-have-multiple-items-selected-in-a-dropdownlist/
Left by Dave on May 01, 2009 2:46 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Hey thanks man..that was a great help for me.
Left by Aalap on May 06, 2009 12:03 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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MarkJaL!!! Thank you :D
Left by Lo0 on May 27, 2009 4:17 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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God bless you, thank you. it was mosthelpful
Left by Manesti on Jun 01, 2009 5:39 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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I followed the above, and still had the problem. Turned out that the issues was because of the way I was adding an additional item to the databound dropdown.

.Insert will always give you this error in this situation. Instead use .Add to add additional ListItem. In 2.o you can leverage property AppendDataBoundItems="true"
Left by PC on Jun 03, 2009 2:20 AM

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Harish Ranganathan
Left by Harish Ranganathan on Jun 30, 2009 1:57 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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it's v good .it' was a great help for me.
Left by saravanan on Aug 03, 2009 6:41 AM

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Thanks man... it was really helpful
Left by Steel on Aug 05, 2009 11:10 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks dude, i had to play with the idea a bit ...

For all who didnt find it helpful - yet - please remember to change your code to

dropdownlist1.Items.FindByText(*TextHere*).selected = true;
Left by Paul van Tonder on Aug 17, 2009 5:57 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Thanks MarkJaL. I was using same instance in multiple drop downs. I didn't need to clear. I just make new instance and it worked
Left by Rahzam on Aug 23, 2009 3:25 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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i got my solution. thanks
Left by liki on Sep 03, 2009 6:36 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Ah, that worked - thanks a lot : )
Left by Phillip Quinlan on Sep 10, 2009 3:47 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Very Thanks Man.........Please Continue this way
Left by Ram on Sep 17, 2009 12:23 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Its a good article indeed, very precise. I am facing a different problem with this error message. I am having a javascript calender control, and this error is showing on that control.
Can someone please suggest a possible solution.
Thx.
Left by Leo 26 on Sep 29, 2009 11:43 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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it is very helpful for me.
Thx
Left by sandeep kumar trivedi on Sep 30, 2009 9:33 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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thnks helped lot
Left by DD on Oct 13, 2009 7:23 AM

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Gr8 stuff. been struggling with this for a day.
Left by Gangatha on Nov 10, 2009 6:50 PM

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Great! You Save my day!!

One question why this:

DropDownList1.SelectedIndex = 3;
or
DropDownList1.SelectedItem.Value = "3";

Are wrong solutions???
Left by Kike on Nov 12, 2009 4:15 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Excellent Tut.
God bless.
Left by Suraj on Nov 19, 2009 12:22 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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thanks for ur information
Left by raj on Nov 20, 2009 2:41 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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Hi,
this grate solution......

Left by manjeev on Dec 11, 2009 2:33 AM

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Thanks!!! I am comming from a VB Winforms/MS Access with VBA background and am trying to get the same functionality with ASP.NET and VB.... and it's been a tough transition. Believe it or not this was driving me crazy!!! Any other new ASP.NET VB programmers out there!? Get back to me at unicompgm@gmail.com.
Left by Mike in Los Angeles on Dec 24, 2009 1:00 PM

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thanks help me a lot!
Left by whole life insurance on Jan 27, 2010 6:24 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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gr8....article with precise explanation
thnx a ton
Left by vaibhav on Feb 05, 2010 8:26 PM

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Nice article,
it saved my time i have been wandering for 1/2 hr to get rid of this error . i couldn't find the location of the error compiler is showing error at wrong location.

Once again, Thanks for the Solution.

Regards, SunilWise
Left by SunilWise on Feb 11, 2010 9:31 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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GREAT!
dropdownlist1.ClearSelection()
Left by Sarmad on Feb 16, 2010 5:46 PM

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nice guy
Left by dg on Feb 19, 2010 9:31 AM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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thanks. It seems simple but u save me a lot.
Left by d on Apr 19, 2010 11:13 AM

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Wow!!!, Thank you sooo much!!, i was breaking my head with this and i can't belive that it solved with a so simple solution.

Your awesome!.
Left by Ramon Vargas on Apr 23, 2010 8:18 AM

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Thanks. It helped me a lot.

Regards,
Anand
Left by Anand on Apr 29, 2010 6:21 PM

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Thanks it helped a lot.
Left by Aalap on May 03, 2010 9:06 PM

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Perfect. Thanks!
Left by Steve on May 14, 2010 3:31 AM

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I have had this issue too, thanks for the views.
Left by Ediscounts on May 23, 2010 10:23 AM

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AL ZAYIFLA
Left by meksika biberi zayıflama hapı on May 31, 2010 11:29 PM

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very very good, congratulations... tranks
Left by cesar on Jun 16, 2010 1:51 AM

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this code is perfect, and it helps me a lot
Left by tamimi on Jun 25, 2010 11:22 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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thank you very much
save my time
Left by nikes on Jun 29, 2010 10:54 PM

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I have spent hours to figure out the solution error and there it is. I didn't know that it would be so simple.
Thanks.
Left by anonymous on Jul 22, 2010 6:51 AM

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This is not the correct solution (for a composite control)!


{
this.EnsureChildControls();

this.categoryDropDownList.SelectedIndex =
this.categoryDropDownList.Items.IndexOf(
this.categoryDropDownList.Items.FindByValue(
value.ToString(CultureInfo.InvariantCulture)));
}
Left by eb on Aug 01, 2010 8:57 PM

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Thanks. Helped a lot.
Left by Raj on Aug 05, 2010 4:05 PM

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thank u dude
Left by naveen on Sep 08, 2010 1:49 AM

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Thanks dude this article helped me a lot to solve an issue in my project..
Left by Pradeep Chowdary on Sep 20, 2010 8:31 PM

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Thanks a bunch man
Left by Royston on Oct 27, 2010 12:16 PM

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Many Thanks , saved lot of my efforts in troubleshooting the problem.
Left by ritesh on Oct 29, 2010 3:49 PM

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thanks, very helpful
Left by tomcat on Dec 17, 2010 3:30 PM

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Alianças Curitiba - Mais que Alianças Uma Prova de Amor
Left by alianças on Feb 13, 2011 11:54 PM

# re: ASP.NET Dropdownlist - "Cannot have multiple items selected in a DropDownList."

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When u use same list item to populate say for example 3 dropdowns. the end result will put u in sudden shock. It just resets the selected index of other dropdowns when u are working with different dropdowns.

The above solution wont work in this scenario. TO overcome you can use something like ths:
dropdown1.items.add(new listitem("A"));
dropdown2.items.add(new listitem("b"));
dropdown3.items.add(new listitem("c"));


Left by Naved on Mar 29, 2011 11:01 PM

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DropDownList1.ClearSelection()-- it worked. Thanks
Left by Nitin on May 29, 2011 2:58 PM

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This Article helped me.. thanks
Left by Jed on Jul 22, 2011 9:25 AM

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It is very helpful . It worked for me.
Left by Vishal V. Dhabade on Aug 23, 2011 9:55 PM

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thanks man u saved my job........
Left by ravi on Oct 06, 2011 12:32 PM

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Thanks man that was a wonderful snippet....i didnt know about this findby value i was using Foreach loop (facepalm) and getting this error. thanks again
Left by Kamran on Oct 07, 2011 2:24 PM

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Thank Q, very much it helped me lot
Left by Srinivasu on Mar 02, 2013 10:21 PM

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Thanks buddy this is working.
Left by santosh panchal on Sep 25, 2013 2:10 PM

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Muchas gracias me sirvió de mucho tu ayuda.
Left by nn on Jul 31, 2014 1:39 AM

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great! Thanks a lot it saved time
Left by Qasim Rafi on Aug 14, 2014 2:48 PM

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Many Many Thnx MarkJaL.Your solution and description for why it is happened ... for the error "Cannot have multiple items selected in a DropDownList." is working fine and understandable.Again thanx for your valuable solution.
Left by Gayatri Prasad Das on Sep 17, 2014 10:38 AM

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Thanks for sharing a good thought, the article is fastidious, that is why I have read it entirely. Download Cbse Ip Projects
Left by Johny Sharma on Jul 12, 2016 5:19 PM

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