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DropDownList SelectedIndexChanged event does not fire in GridView HeaderTemplate

I work on the website of the working group and, in particular, the job search page at the moment. I return the tasks found in DataBound GridView(namely gvwJobs), and inside HeaderTemplateI have DropDownListwith a name ddlSortDirectionthat determines the direction in which the sort is performed:

<asp:DropDownList runat="server" ID="ddlSortDirection" AutoPostBack="true" OnSelectedIndexChanged="ddlSortDirection_SelectedIndexChanged">

    <asp:ListItem Value="DESC">DOWN</asp:ListItem>
    <asp:ListItem Value="ASC">UP</asp:ListItem>

</asp:DropDownList>

As you can see, I made sure that it is AutoPostBackturned on. I also created a special event handler in the event GridView DataBoundlike this:

Protected Sub gvwJobs_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvwJobs.RowDataBound

    If e.Row.RowType = DataControlRowType.Header Then

                ddlSortDirection.AutoPostBack = True
                AddHandler ddlSortDirection.SelectedIndexChanged, AddressOf ddlSortDirection_SelectedIndexChanged


     End If

End Sub

, ddlSortDirection_SelectedIndexChanged , ddlSortDirection. , a PostBack, . , , DropDownList GridView SelectedIndexChanged, !

, : DropDownList SelectedIndexChanged, HeaderTemplate GridView?

+3
2

EnableViewState GridView false

+1

runat="server" DropDownList

:

<asp:DropDownList ID="ddlSortDirection" runat="server" AutoPostBack="True" 
            onselectedindexchanged="ddlSortDirection_SelectedIndexChanged">
</asp:DropDownList>
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