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See more: event DropDownList
I m populating subcategory dropdown fom category dropdown.
but when i change category in category dropdown its "SelectedIndexChanged"event is not is my code:-

<td><asp:DropDownList ID="selectcategorydd" runat="server"
                class="styledselect_form_1" AutoPostBack="true"
            <asp:RequiredFieldValidator ID="rfvc" runat="server"
                ControlToValidate="selectcategorydd"  ForeColor="Red" ErrorMessage="Select category">*</asp:RequiredFieldValidator>
        <th valign="top" > SubCategory:</th>
        <td style="width:30%">
            <asp:DropDownList ID="selectscategorydd" runat="server" AutoPostBack="true" AppendDataBoundItems="True"

 protected void Fill_Category()
            DataTable categorytbl = d.fill_category();
            selectcategorydd.DataSource = categorytbl;
            selectcategorydd.DataTextField = "CategoryName";
            selectcategorydd.DataValueField = "CategoryID";
            selectcategorydd.Items.Insert(0, "--Select--");
        protected void selectcategorydd_SelectedIndexChanged(object sender, EventArgs e)
            int catid = int.Parse(selectcategorydd.SelectedValue);
            DataTable t1 = d.cascadesubcat(catid);
            selectscategorydd.DataSource = t1;
            selectscategorydd.DataTextField = "SubCategoryName";
            selectscategorydd.DataValueField = "SubCategoryID";
            selectscategorydd.Items.Insert(0, "--Select--");
Note:- viewstate is also true in page directive.
Posted 3-Feb-13 20:59pm
JemiM at 4-Feb-13 5:22am
you have placed two dropdown with same id. Please give a unique Id to the controls.
rrjoshi2321992 at 4-Feb-13 5:30am
no its different..there is a diference of "s"
1st ID is "selectcategorydd"
2nd ID is "select's'categorydd"
JemiM at 4-Feb-13 5:35am
did you validate any controls while dropdown change?
rrjoshi2321992 at 4-Feb-13 5:58am
nop i m not validating any control in dropdown index change.

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