Web Forms :: DropDownList Check For SelectedValue?

Oct 15, 2010

I have a DropDownList which is databound and pulls back the values from SQL.

I want to check to see if that record contains an assigned value, if not insert a new listItem.

Here's what I have:

[Code]....

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Web Forms :: Check A Selectedvalue From A Dropdownlist Against More Than One Value?

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In SQL, you can create a query and use a "IN".. Select * from tOffices where OfficeID in ('1', '2', '3'). Is it possible, in my vb.net code behind to check if a selected value is "in" a list of values like this?

If ArrangementID.SelectedValue in ("6","7","99") then...

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Forms Data Controls :: Dropdownlist SelectedValue Error "'branchDDL' Has A SelectedValue Which Is Invalid?

Nov 18, 2010

I have a dropdownlist in DetailsView to which items are added programmatically during DataBound event. It is working fine in InsertItemTemplate, but in EditItemTemplate i am getting this error "'branchDDL' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value".

. Following is the code:

<asp:TemplateField
HeaderText="Course"
SortExpression="branchID">[code]....

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Setting SelectedValue For One DropDownList Also Updates The SelectedValue For Another DropDownLIst

Jul 21, 2010

I have a WebForms page that has two DropDownList controls on it that both contain a range of temperatures from 60-80 degrees, one for heating the other for cooling. They are declared in the .aspx as:

<asp:DropDownList ID="heating" runat="server" />
<asp:DropDownList ID="cooling" runat="server" />

The values for each list are populated in the code-behind using:

for(int i = 60; i <= 80; i++)
{
var listItem = new ListItem(i + " degrees", i.ToString());

heating.Items.Add(listItem);
cooling.Items.Add(listItem);
}

When I try to set the selected value for each DropDownList using the values in an object containing data loaded from the database using:heating.SelectedValue = myHome.avgHeatingTemp.ToString();
cooling.SelectedValue = myHome.avgCoolingTemp.ToString();

The SelectedValue for both lists is set first to the value in myHome.avgHeatingTemp, then to the value in myHome.avgCoolingTemp. Heres what the values are for each variable after each step of the process of setting the SelectedValues:

Initial State
heating.SelectedValue: 60
cooling.SelectedValue: 60 [code]....

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Web Forms :: Ho To Get All Selectedvalue Of All Dropdownlist

Mar 4, 2011

I have nearly 15 dropdownlist on my web form, and one text box,

any of the selectedIndex change, the total must be reflected to text box,

actually, I have different different value in all dropdownlist, I want average in textbox,

So, I want that,any of the dropdown selectedindex change the average must be reflected in textbox,

I can do it by writing in every dropdown's selectedIndexchanged event,

but, I know that is not correct way,I want dynamically,

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Web Forms :: 'Dropdownlist' Has A SelectedValue Which Is Invalid / How To Fix It

Oct 1, 2010

I have a dropdown list that has a bind on it and I get this error. Why am I getting this error and what can I do to fix it. here is the code for the dropdown I currently have:

[Code]....

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May 11, 2010

I have a ASP.Net webform with a DropDownList control. This Dropdown gets it's values from a states table in an ObjectDatasource. The Dropdown contains states spelled out.

If I try to set the drop down to:
DropDownStates.SelectdValue = "Ohio"

I get an error that the value does not exist in the dropdown even though it does exist. But if I pad the value with the correct number of spaces to the right, it works like so:
DropDownStates.SelectdValue = "Ohio "
or
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How can I either define the dropdown without trailing spaces in the value of the dropwdown or set the SelectedValue with adding trailing spaces?

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Aug 26, 2010

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Apr 24, 2010

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

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Web Forms :: Dropdownlist Selectedvalue Doesn't Change?

Jan 21, 2010

[Code]....

here's the code I use after the selectedindexchange

[Code]....

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Mar 18, 2011

i am using one dropdownlist for showing deptname from DB using cascadingdropdownlist and web services.i want when i select dropdown value it should be display in textbox.but don't know how to do this.tell me what is c# code for this.

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Jun 15, 2010

My page has a gridview, and the gridview has a TemplateField called "Acciones" (Actions). The column Acciones has a ImageButton with CommandName "Select" and CommandArgument "Tutor". Thus, the GridView has controlled event "SelectedIndexChanged". The idea is that in GV_SelectedIndexChanged, I must to set DropDownList's SelectedValue property. But, the value seted in this function don't affect the rendered dropdownlist. The debugger talk's that the value is correctly seted, but the visual result don't.

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Web Forms :: Dropdownlist Selectedvalue Always Fires Initial Value Instead Of Selection?

Feb 15, 2011

dropdownlist selectedvalue not firing.

It shows the inital value after i selected the value from dropdown box and submitted

HTML Code:

<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>

.CS File:

Protected void page_load()
{
if (!IsPostBack)
{
Label_Testing.Text = DropDownList1.SelectedValue;
Label_Testing1.Text = DropDownList1.SelectedIndex.ToString();......

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Forms Data Controls :: Display Selectedvalue On Dropdownlist?

Jul 20, 2010

i want to display selectedvalu on dropdonwlist i have a access table like this;1 Adana2 Ankaraits displaying the numbers of cities but i want to display name of the cities in my gridview how can i fix that ? im using theese codes for register page;

string baglan =DugunSitemiz.Properties.Settings.Default.baglan;
OleDbConnection conn = new OleDbConnection(baglan);
conn.Open();

[code]...

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Forms Data Controls :: Dropdownlist Setting Selectedvalue From Formview

Mar 11, 2011

I'm populating a dropdownlist in a formview with a different datasource from the formview's. I need to set the selected value according to the value in the formview's datasource but I'm having a hard time doing that.

Here's the code:
<asp:FormView ID="FormView1" runat="server" DataKeyNames="ID"
DataSourceID="SqlDataSource1">
<EditItemTemplate> [code]....

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Aug 2, 2010

I have a dropdownlist whose values are int (actually they are string basically but they can be parsed. they are 1, 2, 3, 4, 5.. etc)

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Forms Data Controls :: How To Set The Selectedvalue Of A Dropdownlist With Another Objectdatasource Used For Formview

Aug 10, 2010

I'm using a FormView which has odsMain as the datasource. I am also using a dropdownlist which is being populated with objectdatasource odsddl.

I'd like to set the selectedvalue of the dropdownlist with the value contained in odsMain (the current record value for it). Is there any way this can be done?

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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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Nov 25, 2010

I have officially wasted about two days trying to figure out what the heck was going on with my asp.net page. I actually thought it was an issue with my updatepanel code, but after reading another post I was able to reproduce the same results. [URL]

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Mar 28, 2011

I have a form that's being databound with a SQLDataAdapter. I have a DropDownList with a SelectedValue='<%# Bind("FieldName")%>' on it. I was wondering if there was a way I could remove this field and set it dynamically in the codebehind and still have it insert the value of this field with the SQLDataAdapter. The reason for this is because the control I'm using doesn't have a separate InsertItemTemplate, only an EditItemTemplate which serves both purposes, and I need this to dropdownlist to only be databound on Insert.

Right now it's looking like I'll have to stop using the SQLDataAdapter and Update/Insert the data in the codebehind, but I wanted to see if there was something I was missing just-in-case.

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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 .....>
<edititemtemplate>
.... //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>
</asp:dropdownlist
.....//rest of the edititem controls that display correctly.
</edititemtemplate>

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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Web Forms :: DropDownList SelectedIndexChanged Event Not Fired When Programatically Setting SelectedValue?

Oct 27, 2010

In our asp.net web application we load the dropdown list boxes in the page load. We than set the SelectedValue of each dropdown list box to an object from session. We have event handlers for many of the SelectedIndexChanged events of the drop down lists boxes, but these do not get executed when we set the selected value programmatically.

Someone else mentioned this is by design, and only when a user manually changes the drop down list selected index, will the event get raised.

I would think this is a common scenario of wanting the selectedindexchanged event handled when setting the selectedvalue/selectedindex/listitem's selected property, of a DropDownList. What is the suggested way to handle this? Is there a significant drawback of creating a custom control inherited from DropDownList that has the functionality of raising this event when changing the SelectedIndex or SelectedValue?

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Forms Data Controls :: Get Value Of Dropdownlist Selectedvalue - Created Dynamically Inside Gridview

Jun 12, 2010

I am having Gridview ie : inside i have placeholder, So on Gridview_RowDataBound - according the Specific Condition getting from DB then - i am Creating the Dropdownlist dynamically here and assign Datasource. so up to this its ok. My Problem When the user Select any value on the Dropdownlist on Gridview ,

i have one button outside the Gridview so if i click the button i am want to get the dropdownlist selectedValue so on the Button_Click Event

i used foreach row in the Gridview.. but i do no how to get the value. as the Dropdownlist is create dynamically on Gridview_RowDatabound event. but here what i have to write to get the dropdownlist?

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Forms Data Controls :: Prepare Dropdownlist Selectedvalue To Be A ControlParameter Source For ObjectDataSource?

Apr 12, 2010

I have following in many controls:

<asp:ControlParameter Name="SvcCluster_Id" ControlID="frmConfigEdit$ddlCluster" PropertyName="SelectedValue" />

Everything was good before I bumped into the problem when declarative binding (SelectedValue='<# Bind("SvcCluster_Id") >') produced the error, because value has not been found in the list. So i moved binding to the code:

protected void frmConfigEdit_DataBound(Object sender, System.EventArgs e)
{
if (frmConfigEdit.CurrentMode == FormViewMode.Edit)
{
var svcCluster_id = DataBinder.Eval(frmConfigEdit.DataItem, "SvcCluster_id");
var ddlCluster = (DropDownList)frmConfigEdit.FindControl("ddlCluster");
if (svcCluster_id != null && ddlCluster.Items.FindByValue(svcCluster_id.ToString()) != null)
{
ddlCluster.SelectedValue = svcCluster_id.ToString();
}
}
}

But now seems like this happens later than ObjectDataSource tries to access frmConfigEdit$ddlCluster...

How to manage this?

I wouldn't like to move everything to the code (I mean creating Control parameters, etc)

p.s. Oops, actually it works ok for DataBound event! Sorry.

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MVC :: DropDownLIst Setting The Selectedvalue?

Jan 8, 2010

I binded the dropdown from the table Languages, now it shows all the languages:

ViewData("Languages") =
New SelectList(objLang,
"SysLanguageID",
"LanguageName")

Now when I click the edit then the dropdown should show the selectedvalue based on the languageId that is in stored in the Preferences table under the user.If i give the third parameter as the selectedvalue it is showing the selected value but it is not showing the other languages.

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