Question

I have a DropDownList in a header of a GridView and I bind its data in the RowDataBound and place it in the UpdatePanel . I want to retain the selected value after selection(postback) . how ?

here I fill in the dropdownlist

Protected Sub gvStaffList_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvStaffList.RowDataBound

If e.Row.RowType = DataControlRowType.Header Then

    ' Fill the header dropdownlist from the datatable and displaying only the unique values (NOT from database directly) 

    ' ============================= Supervisor name ======================================================
    Dim ddlSupervisors As DropDownList = DirectCast(e.Row.FindControl("ddlSupervisors"), DropDownList)
    For x As Integer = 0 To data.Rows.Count - 1
        If ddlSupervisors.Items.FindByValue(data.Rows(x).Item("SuperId")) Is Nothing Then
            ddlSupervisors.Items.Add(New ListItem(data.Rows(x).Item("SuperName"), data.Rows(x).Item("SuperId")))
        End If
    Next
    ddlSupervisors.Items.Insert(0, New ListItem("All", "All"))

    ' ============================= Supervisor name ======================================================
    Dim ddlPostTitle As DropDownList = DirectCast(e.Row.FindControl("ddlPostTitle"), DropDownList)
    For x As Integer = 0 To data.Rows.Count - 1

        If ddlPostTitle.Items.FindByValue(data.Rows(x).Item(1)) Is Nothing Then
            ddlPostTitle.Items.Add(New ListItem(data.Rows(x).Item(1), data.Rows(x).Item(1)))
        End If
    Next
    ddlPostTitle.Items.Insert(0, New ListItem("All", "All"))

Answer 1

hello use session like that:

Session["selecteditem"] = "your value";

on c#
😉