Cannot get the value from the drop down list

Question

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I use DisplayBusRouteID() assign item from the database. When I use ddlLocation_SelectedIndexChanged() method to select the item from the ddlLocation, the lblBusTicketPrice does not work. What is the problem ?

C#

protected void DisplayBusRouteID()
{
   DataClassesDataContext db = new DataClassesDataContext();

   var query = from s in db.BusRoutes
         select s;

   ddlLocation.DataSource = query;
   ddlLocation.DataTextField = "BusRouteID";
   ddlLocation.DataBind();
       
}
 protected void ddlLocation_SelectedIndexChanged(object sender, EventArgs e)
{
   lblBusTicketPrice.Text = "abc";
}

Posted 20-Dec-13 23:05pm

Ceil Phantomhive

Updated 21-Dec-13 0:06am

Nelek

v3

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Comments

Jignesh Khant 21-Dec-13 5:20am

Is autopostback of ddlLocation set to true? Check That.

OriginalGriff 21-Dec-13 6:23am

"does not work" is not a very helpful error message.
What does it do that you didn't expect, or not do that you did?

6 solutions

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**Nirav Prabtani** · Answer 1 · 2013-12-21T00:30:00

Set

C#

autopostback="true"

of dropdown...:)

C#

protected void DisplayBusRouteID()
{
   DataClassesDataContext db = new DataClassesDataContext();
 
   var query = from s in db.BusRoutes
         select s;
 
   ddlLocation.DataSource = query;
   ddlLocation.DataTextField = "BusRouteID";
  ddlLocation.DataValueField = "BusRouteID";
   ddlLocation.DataBind();
       
}
 protected void ddlLocation_SelectedIndexChanged(object sender, EventArgs e)
{
   lblBusTicketPrice.Text = "abc";
}

Karthik_Mahalingam · Answer 2 · 2013-12-21T01:31:00

make sure your dropdownlist tag has the attribute AutoPostBack="true" and page load method as below..

C#

<asp:dropdownlist id="ddlLocation" autopostback="true" runat="server" onselectedindexchanged="ddlLocation_SelectedIndexChanged" xmlns:asp="#unknown"></asp:dropdownlist>

C#

protected void Page_Load(object sender, EventArgs e)
       {
           if (!Page.IsPostBack)
           {
               // make sure all your initialisation andloading methods are called is in this block.
               // not outside this block

           }
       }</pre>

Praveen_P · Answer 3 · 2013-12-23T01:05:00

Solution 5

Set autopostback property of ddlLocation to true

SQL

<asp:DropDownList ID="ddlLocation" runat="server" AutoPostBack="True"                onselectedindexchanged="ddlLocation_SelectedIndexChanged">
</asp:DropDownList>

Posted 23-Dec-13 1:05am

Praveen_P

farhad Najib · Answer 4 · 2013-12-21T00:27:00

Solution 1

Hi You should set Autopostback=True.
Yours Farhad.

Posted 21-Dec-13 0:27am

farhad Najib

M.R.A. · Answer 5 · 2013-12-21T04:34:00

check the autopostback
then

C#

DataClassesDataContext db = new DataClassesDataContext();
 
   var query = from s in db.BusRoutes
         select s;
 
   ddlLocation.DataSource = query;
   ddlLocation.DataTextField = "BusRouteID";
   ddlLocation.DataValueField = "BusRouteID";
   ddlLocation.DataBind();

ashwani taneja · Answer 6 · 2013-12-23T01:56:00

Solution 6

You can also use Jquery to get the value of dropdown then passes it to hidden field,
and play with that hidden field on another events.

Syntax:

$('#dd').val();

Posted 23-Dec-13 1:56am

ashwani taneja