how i can find extension of file ?

Hi

I want open or save image

this my code

If Request.QueryString("op") = 20 Then Dim savelocation As String Dim fileExt As String Dim idselect As Integer dst_display.Clear() db_adpt = New MySqlDataAdapter("select cardid from `cors` where id=" & Request.QueryString("sr"), dbconnAd) db_adpt.Fill(dst_display, "dst_display") idselect = dst_display.Tables(0).Rows(0).Item(0) savelocation = Server.MapPath("~/corsimg").ToString() & "\" & idselect fileExt = System.IO.Path.GetExtension(savelocation) End If I can not find extension of file and how open this image when press on link
thank you