Weird thing with populating manually a dropdownlist from codebehing.

This is weird, at least to me. I have code that populates 2 dropdownlist in a gridview. DropStart And DropEnd I want to add time values depending on a few things here's the routine I cal.

Code:

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Public Sub GenerateTime(RowIndex As Integer)

        Dim ComboStart As New DropDownList
        Dim ComboEnd As New DropDownList
        Dim ItemList As ListItem
        Dim TimeInterval As Integer
        Dim IntervalleCalcul As Integer
        Dim NombreIntervalles As Integer
        Dim HeureCalcule As String
        Dim Laps As Integer

        ComboStart = GridDetails.Rows(RowIndex).FindControl("DropStartTime")
        ComboEnd = GridDetails.Rows(RowIndex).FindControl("DropEndTime")

        If Not (IsNothing(ComboStart) Or IsNothing(ComboEnd)) Then

            ComboStart.Items.Clear()
            ComboEnd.Items.Clear()
            ' --------------------------------------------
            '  DETERMINATION DES PARAMETRES D'INTERVALLES
            ' --------------------------------------------
            Select Case TimeInterval
                Case 5
                    IntervalleCalcul = 12
                    Laps = 5
                Case 10
                    IntervalleCalcul = 6
                    Laps = 10
                Case 15
                    IntervalleCalcul = 4
                    Laps = 15
                Case 30
                    IntervalleCalcul = 2
                    Laps = 30
                Case 60
                    IntervalleCalcul = 1
                    Laps = 60
                Case Else
                    IntervalleCalcul = 4
                    Laps = 15
            End Select

            NombreIntervalles = 24 * IntervalleCalcul
            HeureCalcule = "00:00"
            ItemList = New ListItem
            ItemList.Text = HeureCalcule
            ItemList.Value = HeureCalcule

            ComboStart.Items.Add(ItemList)
            ComboEnd.Items.Add(ItemList)
            For Compteur = 1 To NombreIntervalles - 1
                HeureCalcule = CalculerTemps(HeureCalcule, Laps)
                ItemList = New ListItem
                ItemList.Text = HeureCalcule
                ItemList.Value = HeureCalcule
                ComboStart.Items.Add(ItemList)
                ComboEnd.Items.Add(ItemList)
            Next Compteur
            ComboStart.DataBind()
            ComboEnd.DataBind()

        End If

End Sub

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now this code is called, and runs fine, it goes in the for loop and I see if I trace it that combostart and comboend both have 96 Items in them as expected. hence it did find the controls in the gridview. but when I exit this sub and continue the code by just running the code in the asp.net page the two corresponding dropdown control don't get the values that did get added in the code behind.

In the RowEditing is when I call this routine.

Code:

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Private Sub GridDetails_RowEditing(sender As Object, e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridDetails.RowEditing

          GridDetails.EditIndex = e.NewEditIndex
        GridDetails.DataBind()
        GenerateTime(GridDetails.EditIndex)

End Sub

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I'm a little more than perplexed by this. lol

Try setting the datasource first and then calling databind method. In that case, the dropdownlist control will have values to render.

See example here: DropDownList MSDN
There's a section on how to create a DropDownList control though data binding. It's using a datatable as the datasource. You can use a collection object such as List<T> as an alternative.

KGC

To say I did something else, I have created another dropdown, this time a database dropdown, it's not getting it's records either. the SqlDataSource it's bounded to has it's data, but it's not showing it in the gridview's dropdown list. this isn't even code, it's an SQL data source, configured that is bounded to the dropdownlist. very peculiar indeed.

Quote:

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Originally Posted by KGComputers

Try setting the datasource first and then calling databind method. In that case, the dropdownlist control will have values to render.

See example here: DropDownList MSDN
There's a section on how to create a DropDownList control though data binding. It's using a datatable as the datasource. You can use a collection object such as List<T> as an alternative.

KGC

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Can you post the aspx markup?

KGC