dropdown SelectedIndexChanged page reload but value null

Question

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Hi
i have 2 dropdown with onselectedindexchanged and autopostback true

when i click dropdown1 the page reloads ,and current select listitem is default in selectbox.., i fill dropdown2 from database depending on dropdown1 value..
then when i click dropdown2 ,page reloads but the dropdown2 selected index remains 0 or blank

what is error

XML

<asp:DropDownList ID="DropCity"  AutoPostBack="True"   onselectedindexchanged="DropCity_SelectedIndexChanged"   runat="server" >
                    </asp:DropDownList>

XML

<asp:DropDownList ID="DropCity1"  AutoPostBack="True"   onselectedindexchanged="DropCity1_SelectedIndexChanged"   runat="server" >
                    </asp:DropDownList>

C#

protected void DropCity1_SelectedIndexChanged(object sender, EventArgs e)
  {

DropCity.DataSource();
DropCity.databing();

}

C#

protected void DropCity_SelectedIndexChanged(object sender, EventArgs e)
    {

}

please advice

Posted 30-Jan-14 23:46pm

maulikshah1990

Updated 31-Jan-14 0:03am

v3

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Comments

DipsMak 31-Jan-14 5:55am

you are having issues with checkbox or dropdowns..????

maulikshah1990 31-Jan-14 6:01am

updated question...pls check

Bojjaiah 31-Jan-14 6:47am

1) Check isPostback is there not in you Page_Load()?
2) other wise post you full of code

3 solutions

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DipsMak · Answer 1 · 2014-01-31T00:39:00

Bind the values to drp2 in drp1's SelectedIndexChanged event..
If you not doing any operation on drp2 index changed event then set autopostback = "false"

make use of properties as below

C#

drp1.DataTextField = "Test1";
               drp1.DataValueField = "TestID";
               drp1.DataSource = dt;

               drp1.DataBind();

Member 10476757 · Answer 2 · 2014-01-30T23:54:00

Solution 1

set autopostback =fasle for dropcity1

Posted 30-Jan-14 23:54pm

Member 10476757

maulikshah1990 · Answer 3 · 2014-01-31T00:49:00

Solution 3

Hi i solved it.. i check in DropCountry , if Dropcity is null ,then only fill it..
so this runs now

Posted 31-Jan-14 0:49am