I want filter my technologies in depend on selectedvalue in dropdownlist, but indexchanged event is not raising, not fired
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" DataSourceID="SqlDataSource1" AllowPaging="True"
AllowSorting="True" PageSize="20" ondatabound="GridView1_DataBound">
<Columns>
<asp:BoundField DataField="Od" HeaderText="Od" SortExpression="Od"
DataFormatString="{0:dd.MM.yyyy, HH:mm}" HtmlEncode="False" />
<asp:BoundField DataField="Do" HeaderText="Do" SortExpression="Do"
DataFormatString="{0:dd.MM.yyyy, HH:mm}" HtmlEncode="False" />
<asp:TemplateField HeaderText="Technologie" SortExpression="Technologie">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Technologie") %>'></asp:TextBox>
</EditItemTemplate>
<HeaderTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource11" DataTextField="Popis" DataValueField="ID"
ondatabound="DropDownList1_DataBound" EnableViewState="False">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource11" runat="server"
ConnectionString="<%$ ConnectionStrings:produkce %>"
SelectCommand="SELECT ID, Popis, Visible FROM Technologie WHERE (Visible = 1)">
</asp:SqlDataSource>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Technologie") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Operace" HeaderText="Operace"
SortExpression="Operace" />
<asp:BoundField DataField="Zařízení" HeaderText="Zařízení"
SortExpression="Zařízení" />
<asp:BoundField DataField="Text" HeaderText="Text" SortExpression="Text" />
<asp:BoundField DataField="Vytvořeno" HeaderText="Vytvořeno"
SortExpression="Vytvořeno" DataFormatString="{0:dd.MM.yyyy, HH:mm}"
HtmlEncode="False" />
<asp:BoundField DataField="Autor" HeaderText="Autor" SortExpression="Autor" />
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" Visible="False" />
</Columns>
<HeaderStyle ForeColor="White" />
<AlternatingRowStyle CssClass="sedivy" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:produkce %>"
SelectCommand="SELECT Záznamy.od AS Od, Záznamy.do AS Do, Technologie.Popis AS Technologie, Operace.Popis AS Operace, Všechna_zařízení.Jméno AS Zařízení, Záznamy.text AS Text, Záznamy.vytvořeno AS Vytvořeno, Záznamy.autor AS Autor, Záznamy.ID FROM Záznamy INNER JOIN Operace ON Záznamy.id_operace = Operace.ID INNER JOIN Technologie ON Operace.Technologie_ID = Technologie.ID INNER JOIN Všechna_zařízení ON Záznamy.id_zarizeni = Všechna_zařízení.ID ORDER BY Vytvořeno DESC">
</asp:SqlDataSource>
protected void DropDownList1_DataBound(object sender, EventArgs e)
{
DropDownList ddl = sender as DropDownList;
ddl.Items.Insert(0, new ListItem("-- All items ---", "-1"));
}
dropdownlist not fired in header template
