C# - Binding DropDownList's SelectedIndex To 0 If Value Does Not Exist?

Mar 17, 2011

I have a DropDownList in a DetailsView, which binds a user's 'AllocatedUser' to a user in the Users table. Occasionally, we'll have some mishaps in the database where the user allocated isn't in the users table, which the DropDownList is filled with. In this case the site crashes and we get a 'SelectedValue does not exist in the list of items error'.What I want to do is catch any binding errors like that, and just set the DropDownList index to 0. I've tried something like this:


but it doesn't like the syntax of that.

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Forms Data Controls :: Binding A Textbox To A Dropdownlist Selectedindex?

Feb 11, 2010

I'm having trouble binding my textbox to my dropdownlist. I got it to work but I don't think it is the correct way of doing it. I have my DDL bound to a datasource and populating everything correctly. However, I couldn't find a better way of binding my textbox to it besides using the FormView control and its counterpart, Templates (edit,insert,etc) It looks messy and i was hoping there was a better way of doing it. I've researched it online for awhile now but I couldn't understand how to implement for my situation.

My DDL has company names in it and the datasource has all the information from the table including what I'm trying to have my textbox pull (Address).

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DropDownList's SelectedIndex Value Is Incorrect?

Jun 21, 2007

I have an issue that I haven't been able to figure out - I have a DropDownList control within a WizardStep that is populated dynammically. It properly shows the right list of items, but when I select items it sometimes (not always!) moves the selection to a previous item. E.g. there are 3 items in the list and when I choose the third it changes to the second.

Below is the section from my aspx file and the code-behind file where I am detecting the incorrect index:


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Get SelectedValue At SelectedIndex In DropDownList?

Dec 9, 2010

Is this possible? I programatically change the selected index when a certain event is fired using this code:DropDownList.SelectedIndex = DropDownList.SelectedIndex + 1ow I want to update a corresponding textbox with the text that is in the new SelectedIndex of the DropDownList via postback.I know how I can do this in javascript

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Unable To Use DropDownList SelectedIndex And DataTable

Nov 14, 2008

I have a DropDownList bound to a sqlDataSource, and a TextBox that is to receive a value from a DataSet upon the DropDownList Selection. Each time the first selection of the DropDownList is selected the value of the DataSet second row(1) is passed to the TextBox instead of passing the value of the first row (0). See Code Below.


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DropDownList Not Changing SelectedIndex/Value/Item?

Aug 31, 2009

Visual Studio 2008, C#, SQL Server 2005

I swear this was working before.

I have a drop down list of all the users in a particular role.


The problem is, when I try to access the selected index/item/value, it always selected the first name in the list and never the one that the dropdownlist has been changed to. None of the following solves the problem:


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Web Forms :: How To Set DropdownList Initial SelectedIndex

May 1, 2006

I have a form with a dropdownlist named ddlCustomer. When the page loads I want to set the selectedindex to the 1st item in my ddl and then call a routine that updates the form to the data for that customer. I have tried the following code, but the ddl selectedindex remains at -1. How do I get this to change?


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C# - DropDownList OnChange Not Working At SelectedIndex 0?

Jul 2, 2010

I have 3 security question drop down menus. I have javascript on the ASPX page that removes questions/repopulates them when you select a questions (so you cannot reselect the questions in the other 2 boxes). This works wonderfully when a user is editing their profile with already selected questions. However, when a user first selects the questions where all three boxes are listing "select a question" at selectedIndex 0, the onChange doesn't fire. The function won't even go. I think this has a big something to do with the on change from selected index of 0. I have debugged this thing and it doesn't even enter the function. I even set the onchange action to flash an alert. It just seems something is going wrong when i try to action onchange from selected index of 0.

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Web Forms :: DropDownList SelectedIndex Doesn't Set

Jul 19, 2010

I have a dropdownlist, who's items I bind from the codebehind file of an asp.net web page. After databinding, I want to set the selected index as the last item in the list, thus:


However, this does not work. When the page is done loading, the selected index is still zero.

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Web Forms :: How To Set The SelectedIndex Of A DropDownList Based On The SelectedValue

Apr 24, 2010

how do I set the SelectedIndex of a DropDownList based on the SelectedValue

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AJAX :: Setting SelectedValue Or SelectedIndex For CascadingDropDown Or DropDownList

May 9, 2007

I am trying to set selectedindex/ text property for DropDownList that is attached to CascadingDropDown, which does not work.Then I tried setting SelectedValue property of CascadingDropDown, which also does seem to work

Is there any way I can change selected item in the dropdown in the VB code file during runtime?

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Setting To Selectedindex Or Selectedvalue Of A Dropdownlist In A Repeater Not Working

Aug 16, 2010

I have a repeater with a DropDownList in it. I set the datasource of this list in the itembound event en set the selectedindex. When I debug the selectedindex is set, but when the page is done loading for all the item the default item is selected.

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
var ddl = (DropDownList)e.Item.FindControl("DataFeedItems");
ddl.DataSource = FilterDropDownData();
ddl.DataTextField = "ColumnName";
ddl.DataValueField = "ColumnName";

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How To Change SelectedIndex On DropDownList When AutoPostBack Property Is Set False

Dec 26, 2008

How can i change selectedIndex on a dropDownList when autoPostBack property is set false.

and to do so using vb.net..

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Forms Data Controls :: Dropdownlist Selectedindex Changed Will Not Fire ?

Jun 14, 2010

I wanted to create a dropdownlist that would trigger an asynchronous postback and update the Gridview inside the Updatepanel. However, no matter what I do, when the dropdownlist changes, nothing in the UpdatePanel will change, even the TestLabel....I've been banging my head against the walls for days on this -- why won't this work? When I remove the UpdatePanel code and triggers, all the code works, eg, you change the dropdownlist andthen gridview updates -- but it refreshes the page and this is why I wanted to put the Gridview inside an Updatepanel to make it look cleaner.[Code]....

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Forms Data Controls :: SelectedIndex In DropDownList Inside DataList?

Feb 25, 2010

I have dropDownList in EditItemTemplate in DataList which is used to choose value from possible ones.

To display cuurent value I used SelectedIndex='<%# (int)(QuestionType)Eval("Type") %>' inside he dropDownList.

But then I started to dataBind dropDownList dynamically and it stopped working...

Why? When does the code in SelectedIndex='<%# this code %>' works?

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Forms Data Controls :: Linq / DropDownList Gives Error On Selectedindex

Nov 21, 2010

LinQ / DropDownList gives error on selectedindex


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Forms Data Controls :: Getting DataKeyField Value In DataList After DropDownList SelectedIndex Changes?

Dec 29, 2010

I have a datalist where each item consists of a textbox and a dropdownlist. I want to get the datakey value when a selected dropdownlist item changes. I can get the selected value of the dropdownlist, but I can't figure out how to get the key field value of the datalist row item that the dropdown resides in.



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AJAX :: Trigger Function While Selectedindex Changed In Cascading Dropdownlist

Jan 2, 2010

i can populate cascading dropdownlist by using webservice now. but may i know how do i trigger function while selectedindex changed? (without using auto postback...)

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Web Forms :: Dynamically Generated DropDownList SelectedIndex Overwritten In Paging

Jan 27, 2011

I am generating Dropdownlists to each row that I get of a database table and then bind them to an asp table.

I am doing the paging of the asp table myself. I'm just adding the rows regarding to the page.

Example: Page 2 (10 rows) => Rows 11 -20

The problem is, when I click a next button to get to the next page. The selectedindex of dropdownlists on the next page are getting overwritten.

I am loading the table in the page_load.

Here is some code of page_load[Code]....

And this is my load_table:

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AJAX :: Dropdownlist Selectedindex Changed Will Not Fire And Update Gridview In UpdatePanel?

Oct 6, 2010

I'm trying to do a similar thing -- I have a long form and in part of it, I have an updatepanel.

Inside the updatepanel I have:5 dropdowns (using the CascadingDropdown functionality)One AddProduct ButtonGrid or Repeater (haven't set it up yet)

I want the following to happen:I have the AddProduct Button disabled initially, but I want it to be enabled once the 5th dropdown is selected (so OnSelectedIndexChanged).If they click the AddProduct button, I want it to populate a Grid or Repeater.So far I am just trying to show what the selection was in a label... but nothing happens. I have an OnSelectedIndexChanged function for the last dropdown, so it enables the button, but that doesn't appear to get called. Previously, before disabling the button, I tried updating the label on button click -- and nothing there either.

It just seems like, because they are in the updatepanel, those callbacks never happen. I also do have UpdateMode = Conditional and I have both items in the triggers list.

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Forms Data Controls :: What Is The Code For Dropdownlist After Binding All Columns Name In A Dropdownlist

Mar 28, 2011

Currently,below is my code.

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
SqlConnection conn = new SqlConnection("Data Source= E\SQLEXPRESS;" + "Initial Catalog=k;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "select column_name from information_schema.columns where table_name='examtimetable' '" + dd_list + "'";....

I receive an error "Incorrect syntax near 'System.Web.UI.WebControls.DropDownList'."

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Forms Data Controls :: SelectedIndex Of DropDownList Using TableAdaptor Data Source?

May 26, 2010

I am populating a dropdownlist in a detailsView on Page_Load using a table adaptor as follows



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Forms Data Controls :: Session And Dropdownlist - Gridwiew Show Data By Remmeber Old Selectedindex?

Jun 24, 2010

when i change page from page1 to page 2 I remember Dropdownlist in session


now when i go back to page1 I set the Dropdowlist the way what it was before i left page1


Everything its remember but when i load the page with my Dropdownlist again. The selectedindex shows default value in the control Dropdownlist.But it does remmeber old selectedindex.I got it wired with Gridwiew and gridwiew show Data by remmeber old selectedindex. Well generally I like to remember selectedindex when i go to a differente page and when i go back have it set in the control dropdownlist the way when i left the page

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Binding Item To Dropdownlist From Another Dropdownlist?

Nov 7, 2008

i have two dropdownlist.i bind somthing to first dropdownlist from database.I want when I select an item from dropdownlist1 see some item in dropdownlist2 .but when i select item from dropdownlist1 ,I give this error.

i wrote this code but it doesn't work.

for binding item to dropdownlist1 i wrote this code:


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Control Or Jquery Plugin Exist For Auto Complete DropDownList?

Nov 20, 2010

is there any Control or Jquery Plugin exist for asp.net Auto Complete DropDownList? link a sample here.I don't want use asp.net ajax control toolkit

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Web Forms :: DropDownList Has A SelectedValue Which Is Invalid Because It Does Not Exist In The List Of Items?

Mar 5, 2010

I have a page with some bound DropDownLists (DDLs) for a Call Logging system. The Calls are categorised on three levels for example:

Call: 3069, Category 1: Incident, Category 2: Microsoft Application, Category 3: Word would be used to organise calls for problems with Microsoft Word. On testing the system, I noticed that there was no handling for opening a call if the category had been deleted - say for reorganisation/systems no longer supported whatever. So I set about trying to make the program behave in the following manner:

Check category ID exists in DDL before bindingIt doesn't: set the displayed text of the DDL to Category Name + "(Deleted)"Disable the control to prevent user changingMove on to next control Seemed simple enough, however no matter which way I try and do it I always get the messase ddl_Cat1 has a SelectedValue which is invalid because it does not exist in the list of items. What's really puzzling me is that the exception doesn't seem to be being thrown in the code behind. I've gone through line by line from Page_Init and it never throws and exception. Just when the page loads this appears.

Does anyone know of a reason as to why this wouldn't work? (I've already tried setting the selected value to an existing item, adding a new list item with the value and setting DataSource property to Nothing - in all different combinations.)

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Forms Data Controls :: Dropdownlist Selectedvalue Does Not Exist Error?

Mar 2, 2011

I have a drop down list inside a formview control's edititemtemplate and itemtemplate. The dropdown list is not bound to a data source. I am hard-coding the listitems for the drop down list. The formview is bound to a datasource. All I want to do is set the selectedvalue of the dropdown to what is in the record from the database. But I keep getting the error.

<asp:formview .....>
.... //some other controls like textboxes that are correctly bound and display the value from the datasource
<asp:dropdownlist ID=myddl runat=server cssclass=myclass selectedvalue='<%# eval("mychoice") %>'>
<asp:listitem value='0'>I dont know</asp:listitem>
<asp:listitem value='1'>Yes</asp:listitem>
<asp:listitem value='2'>No</asp:listitem>
.....//rest of the edititem controls that display correctly.

Just for kicks, I added a textbox and set it's value to eval("mychoice") as well and it correctly prints 0,1 or 2. So, I know that there is no illegal value coming back from the datasource. It seems as something with the timing of events - when the listitems are getting bound to the ddl. The error I get is - "myddl has a selectedvalue which is invalid because it does not exist in the list of items".

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Forms Data Controls :: Dropdownlist In Edit Template, In Detailsview. Getting "SelectedValue Does Not Exist In List?

Jun 7, 2010

I have a standard gridview and detailsview. My detailsview has some fields which are templates, with dropdownlists. The user selects a record in the gridview, then can go down to the detailsview, select Edit, and change some values (using dropdownlists).I am getting the error, "DDL has a selectedvalue which is invalid because it does not exist...." when I click Edit in the detailsview.

I know the problem has something to do with the dropdownlists not being instantiated or bound until I enter Edit mode. Is that right? In what event should I databind my dropdownlists? I've tried several things but could not get it to work. Do I have to loop through all the rows of my details view looking for the dropdownlists, or can I access them directly from some event?

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Binding A Dropdownlist In A Gridview?

Aug 19, 2009

i have a the Following SP

/*This Stored Procedure will create get the
resources based on the ID and the Type of Resource
ALTER PROCEDURE sp_Get_Resource_Based_Type_ID

because the Dataset in the load event of the Usercontrol will only be available , i created a Glabal dataset that will be accessed by the event RowDataBound in order to bind the dropdown list. If there was a way i know to bind it like other template fields i would have done it in the same place. Now my problem is that the Dropdown in the Grid is Showing duplicates like as depicted in this photo ,I want each Record to have only one record

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Why Does The Dropdownlist Not Work When Binding

Oct 9, 2009

I have placed a dropdown list in the edititemtemplate of a formview control and followed specific MSDN instructions on how to bind the list source to a separate SQL lookup data source but have the formview bound to the main data source. If I set the selecteditem value to bind to the formview control I always get the following error:

'DropDownList2' has a SelectedValue which is invalid because it does not exist in the list of items.

This is my asp:

<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource2" DataTextField="Type"
selectedvalue='<%# Bind("ServiceProviderType") %>'>

I have read over 50 posts on this and got nowhere

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