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Old January 16th, 2004, 04:09 PM
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Default selected item in dropdown not saved on postback

My dropdowns which are populated from db are not saving when form is submitted...all other fields working correctly AND all dropdowns not populated with db working correctly. View source on client-side shows dropdowns with correct values.

code to populate dropdown on code-behind page:

'set room dropdown
        Dim myReader As SqlDataReader
        myReader = SqlCommand5.ExecuteReader
        room.DataSource = myReader

code on aspx page for dropdown:

<asp:dropdownlist id="room" runat="server" DataValueField="RoomID" DataTextField="Name" DataMember="Rooms" CssClass="small"></asp:dropdownlist>

code to try and insert dataselection from dropdown:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        SqlCommand1.Parameters.Item("@room").Value = room.SelectedItem.Value
End Sub

when executing code, i get no errors, when stepping through, value on room.selecteditem.value is always 1 no matter what selection I make. I inserted an onselectionchanged event to fire when a new item was picked from the dropdown, but it never fires, although the new selection is shown client-side.

this is driving me crazy! any ideas???? anyone?

Old January 16th, 2004, 04:15 PM
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Most likely what's happening is that you are databinding the dropdownlist every time the page loads. This is not necessary with .net. The ASPX will save all the dropdown list items in viewstate and "reconstruct" the list when you post the form. Part of this reconstruction is setting which item is selected based on the posted information. When you bind each time the page loads you are causing the item you selected to be ignored. You need to bind the control only once, based on the postback state of the page.

If Not IsPostback Then
    'Databind the dropdownlist here
End If

Work smarter, not harder.
Old December 20th, 2004, 09:27 AM
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I am seeing this same problem.

I have set my code inside the "if not ispostback...", but it still behaves the same way.

I have put this code in the Page_Load and dropDownList_Init with the same results in both places.

Any other hints?


Old March 6th, 2006, 08:44 AM
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I am experiencing the same problem. I am looking to retrieve the selecteditem of a dropdownlist, but none of the dropdownlist information is being returned on postback. Any ideas?

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