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Declaring a DropDownList in ASP .Net

Posted By: Venkat     Posted Date: February 13, 2010    Points: 2   Category :ASP.Net
A DropDownList is also commonly known as combo box. It can contain multiple data members, but unlike a normal list box the users can choose only one value from this control. Though the functionality of this DropDownList is much like a Single Row Select List Box, a DropDownList can save a lot of GUI space as it is rendered on a Single line and is expanded only when the user clicks on the Control

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ASP.NET DropDownList Web Control, Part 1

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How to bind GridView and DropDownList controls using DataTable object

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How to bind TemplateField DropDownList with ArrayList?


Hi Expert!

  I'm trying gridview templateField DropDownList bind with arraylist. When i set bindsource i got this error. "//Error Object reference not set to an instance of an object."

My Sample .aspx

<asp:TemplateField HeaderText="Type">
                        <asp:DropDownList ID="_grvcboType" runat="server" Width="117px" DataTextField="Display" DataValueField="Value">
                        <asp:Label ID="Label7" runat="ser

how to make a dropdownlist looks like google search box


dear all...

any idea how to do that ?

Thnx in advance

styling dropdownlist problem


Dear All,

im facing a problem while styling my ddl, what i did is:

<div><asp ropDownList ID="DropDownList1" runat="server" style="background-color:Transparent;" Width="100%">
    </asp: dropDownList></div>

<div class="stlGradient">
<asp ropDownList ID="DropDownList1" runat="server" style="background-color:Transparent;border:none;" Width="100%"></asp: dropDownList>

the DIV style is having a bg image repeated X.

now this worked on Firefox
on google Chrome: the border gone but the background still white
on IE 7: nothing happend

thanks for helping.

dropdownList CSS



Does anyone know what is the asp:dropdown's css is? I'm trying to make my ajax's comboBox to look the same as asp dropdown's css but I can't seem to find the default dropdown's css.

how to bind Dropdownlist based on textbox values



I have one drodownlist which show data based om textbox values...

Let us consider i have 

Select Name from table1 where Type IN(@typ)

here @typ is textbox values

here for example textbox will have some thing like this L1,L2,L3..

How to filter Name based and shown in drodownlist based on this L1,L2,L3(on textbox)..

Help me in this

DropDownList within FormView Error

I have a FormView which works find and I have added a new DropDownList within the form which references another table to which I need to select a value,
I have added the dropdownlist2 and setup a new connection string to this, when I run the page I get this error:

Could not find control 'DropDownList2' in ControlParameter 'CurrencyID'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Could not find control 'DropDownList2' in ControlParameter 'CurrencyID'.
any help would be greatly



In dropdownlist show the PatientID of table. 

when we select the id then show the PatientName in the textbox on the behalf of PatientID

Can't Find DropDownList In Control Parameter

I have a page with 2 Content Controls. Content1 has a SqlDataSource with a Control Parameter
that uses a Dropdown list. The dropdownlist is in Content2. I used viewsource to get
the dropdownlist control name which was
ctl00_ContentPlaceHolder6_ddlPersonFilter. I also got an error if I used ddlPersonFilter.
Thanks for any assistance.

Could not find control 'ctl00_ContentPlaceHolder6_ddlPersonFilter' in ControlParameter ''.

<%@ Page Title="Deal ToDos" Language="VB" MasterPageFile="~/Protected/secureds_deal.master" 
                            EnableTheming="true" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<%@ MasterType 

Dropdownlist in ListView


I have a transaction table with a field called product. There is a limited number of choices for product so I also have a product table. I am showing the transactions in a ListView with a dropdownlist for Product. The field Product can be blank (all works well then). The user can leave the field blank or they can choose from the dropdownlist. I am running into a problem with the dropdownlist in the Edit Template. No matter what the product is in the transaction file, I get a page error of "ddlEditProduct has a SelectedValue which is invalid because it does not exist in the list of items". I have verified the product does exist in the product table.

My markup is:

<asp:DropDownList ID="ddlEditProduct" runat="server"
SelectedValue='<%# Bind("Product") %>' >
<asp:ListItem Selected="True"></asp:ListItem>


using 3.5 and C#

How to handle Active and inactive items in the dropdownlist?


It is a general ASP.NET questions. Many times some items in dropdownlist will become inactive (retired)or active again. It is easy to handle in the new records which use only currently active items. But how to handle the inactive items which need to be used to show history records. It bothered me a long time, not sure how to solve this problem efficiently.


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