post back issue in dropdowncontrol in asp.net

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Dear,

I am in trouble controlling two drop-down control,
Problem:

when,first drop-down control select,then 2nd drop-down control select(it has event),then first control reload,I have checked several way to find out the problem,I can not find any difficulties that will reload first drop-down

 if (!IsPostBack)
        {
           first & 2nd control load this way
        }

if anyone have previous experience to solve this issue,please help me.
N.B.: first control rad dropdown & 2nd control normal asp.net drop-down.Page has Update Panel & Rad ajax Panel.

Thanks in

Posted 14-Sep-13 23:26pm

Mahmudunnabi

Updated 15-Sep-13 0:35am

v2

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DontWasteMyTime · Answer 1 · 2013-09-15T17:20:00

Hi!.

i think you need updatepanel for this

first you need AJAX extensions VS2010 has this toolbox

first thing to do drag and drop script manager to you page or to your master page
so ajax script can be used
*note
script manager need just for one page
but if you have masterpage you can put it there so you would not put it again.

then drag and drop update panel to your page
then after that under update panel put ContentTemplate
then put your dropdownlist inside contenttemplate

the code will look like this

XML

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:DropDownList ID="DDL1st" runat="server">
            </asp:DropDownList>
             <asp:DropDownList ID="DDL2nd" runat="server"  AutoPostBack="True">
            </asp:DropDownList>
        </ContentTemplate>

Look at 2nd DDL the autopostback=true so that any event that fired by 2nd dll will be executed

remember all of this is inside the updatepanel so all post back will be handle without refreshing your page.

i hope this is the answer to your question

Dholakiya Ankit · Answer 2 · 2013-09-15T20:33:00

Well keep it simple you will find an answer
first dropdown

HTML

<drop....  önchange="dropdownchangeevent">
<listitem value="1">1</listitem>
<listitem value="2">2</listitem>
</drop....>

second one

XML

<drop....>
<listitem value='1'>1</listitem>
<listitem value='2'>2</listitem>
</drop>

now in c#

C#

protected void dropdownchangeevent(object sender, EventArgs e)
    {


//here from frist dropdown seleted values bind second dropdown

now add dropdown1.selecedvalue=whatever you want to select 

}

regards..:)

post back issue in dropdowncontrol in asp.net

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