How do I retain the selected item from a dropdownlist after postback

Question

The project is for ASP.NET with a VB server side script.

I have a dropdownlist that fills itself up from a datasource. It posts back with other queries, but problem is that the selected item on the dropdownlist resents to what's on its index 0.

Is there any way that I can retain the value selected after postbacK?

Here's some code:

>     Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
>         If Not IsPostBack Then
>             Dim qs = Request.QueryString.GetKey(0)
>             Dim po As New ProductObj
>             Select Case qs
>                 Case "br"
>                     Dim x = Request.QueryString("br")
>                     Dim y = Request.QueryString("c")
>                     po.GetCategories(ddlasdf, x)
>                 Case "ca"
>                     Dim y = Request.QueryString("ca")
>                     Dim x = Request.QueryString("b")
>                     po.GetBrands(ddlasdf, y)
>             End Select
>         End If
>     End Sub
>     
>     Protected Sub ddlasdf_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlasdf.SelectedIndexChanged
>         Dim qs1 = Request.QueryString(0)
>         Dim qs2 = Request.QueryString.GetKey(0)
>         MsgBox(ddlasdf.SelectedItem.Text)
>         Select Case qs2
>             Case "br"
>                 Response.Redirect("List.aspx?br=" & qs1 & "&c=" & ddlasdf.Text)
>             Case "ca"
>                 Response.Redirect("List.aspx?ca=" & qs1 & "&b=" & ddlasdf.Text)
>         End Select
>     
>     End Sub

Thanks in Advance.

Answer:

So I solved it myself. Just got the query string index 1 and put it as the text attribute for ddlasdf on page load, inside !IsPostBack. Thanks everyone.

Answer 1

So I solved it myself. Just got the query string index 1 and put it as the text attribute for ddlasdf on page load, inside !IsPostBack. Thanks everyone.