Dropdown Value is getting reset after selectionchanged

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Hi..

Following is my code,even though am using update panel for dropdownlist its getting reset after i select different value:-

C#

<asp:UpdatePanel runat="server" UpdateMode="Always" ChildrenAsTriggers="true">
                   <ContentTemplate>
                       City:
                       <asp:DropDownList ID="ddlCity" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlCity_SelectedIndexChanged">
                       </asp:DropDownList>
                   </ContentTemplate>
                   <Triggers>
                       <asp:AsyncPostBackTrigger ControlID="ddlCity" EventName="selectedindexchanged" />

                   </Triggers>
               </asp:UpdatePanel>

Please let me know,wat am i missing?

Thank you.

Posted 31-Jul-13 20:28pm

bhagyap

Updated 31-Jul-13 20:48pm

v2

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VICK 1-Aug-13 2:46am

Have you tried using EventName = "SelectedIndexChanged" or EventName="IndexChanged" ???

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Anele Ngqandu · Answer 1 · 2013-07-31T21:07:00

if you loading your dropdown dynamically using c# code then try this

C#

protected void Page_Load(object sender, EventArgs e)

{

if (IsPostBack)
    {
//code to load yo dropdown

    }
}

OR

C#

if (!IsPostBack)
    {
//code to load yo dropdown

    }

Then you can set AutoPostBack="true" for yo control.

It worked for me.

Mukesh Ghosh · Answer 2 · 2013-07-31T20:35:00

Solution 1

Make AutoPostBack="true" as False

Posted 31-Jul-13 20:35pm

Mukesh Ghosh

Comments

bhagyap 1-Aug-13 2:37am

Tried it.. But the exception still persists.

Yasir Farooq · Answer 3 · 2013-07-31T20:36:00

Solution 2

XML

In Trigger
<asp:AsyncPostBackTrigger ControlID="ddlCity" EventName="SelectedIndexChanged"/>

in cs you must have
protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)
{

}

Posted 31-Jul-13 20:36pm

Yasir Farooq

Updated 31-Jul-13 20:39pm

v2

Comments

bhagyap 1-Aug-13 2:40am

ya i have it in cs but still the exception persists. Please let me know what i might be missing.

Adarsh chauhan · Answer 4 · 2013-07-31T20:42:00

Solution 3

OnSelectedIndexChanged its calling a method "ddlCity_SelectedIndexChanged".
make sure that it exist in code behind.

or if you don't need anything to be done on selected index changed event just remove
OnSelectedIndexChanged="ddlCity_SelectedIndexChanged"

Posted 31-Jul-13 20:42pm

Adarsh chauhan

Comments

bhagyap 1-Aug-13 2:45am

ok.. but what i have to do with the dropdown which is resetting?

Adarsh chauhan 1-Aug-13 2:48am

set AutoPostBack="False" for dropdownlist

Dropdown Value is getting reset after selectionchanged

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