SelectedIndexChanged of dropdownlist in asp.net is not firing

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i m using asp.net,C#,VS 2005,sql server 2005..

i have a aspx page...
when Page_Load(object sender, EventArgs e) occurs iam loading dropdownlist with some text values such as study1,study2.... from database...

but when i click on these items SelectedIndexChanged(object sender, EventArgs e) of dropdownlist does not firing...

any help plz...

regards
karan

Posted 11-May-11 21:11pm

karan joshua

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Mahendra.p25 · Accepted Answer · 2011-05-11T21:12:00

Solution 1

set autopost back property of dropdown = True

like Below

<asp:DropDownList ID="Dropdown1" runat="server" AutoPostBack="true">

Posted 11-May-11 21:12pm

Mahendra.p25

Updated 11-May-11 21:17pm

v3

Comments

karan joshua 12-May-11 3:23am

thank u sir... It works

one more question:

when i SelectedIndexChanged occurs whatever items there in dropdownlist is added again to DDL..

i.e. if initially 4 items were there on 1 event 8 items will be added then one more event 12 etc

wht s the problem..?

regards
karan

Mahendra.p25 12-May-11 3:27am

Post your code

karan joshua 12-May-11 3:30am

<asp:DropDownList ID="StudyIDTextBoxDropDownList" runat="server" Font-Bold="True" AutoPostBack="true"
Font-Size="Large" ForeColor="Black" Height="23px"
Width="198px" OnSelectedIndexChanged="StudyIDTextBoxDropDownList_SelectedIndexChanged" >
<asp:ListItem Value="-1" Selected="True">Select

Mahendra.p25 12-May-11 3:31am

Code behind code

Mahendra.p25 12-May-11 3:32am

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
BindDropdown

}
}

karan joshua 12-May-11 3:36am

It is also working sir... thank u very much...

karan joshua 12-May-11 3:34am

k sir it works now..

i have added:

StudyIDTextBoxDropDownList.Items.Clear();

when the page_load occurs

thank u sir....

Mahendra.p25 12-May-11 3:42am

WC