asked on

Dropdown within repeater not updating

Hi,

I have a Dropdownlist inside a repeater that is not updating. I am getting error

An unhandled exception of type 'System.StackOverflowException' occurred in System.Data.dll

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My design is as follows

<asp:DropDownList ID="DropDownList3" runat="server" DataValueField="Line" SelectedValue='<%#DataBinder.Eval(Container.DataItem, "Line")%>' OnDataBinding="getLines"></asp:DropDownList>

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Code is

Protected Sub getLines(sender As Object, e As System.EventArgs)
        Dim DropDownList3 As DropDownList = DirectCast(sender, DropDownList)

        Dim cmd As SqlDataAdapter = New SqlDataAdapter("select Line from dbo.production_lines order by Line", cnn)
        Dim ds As DataSet = New DataSet()
        cmd.Fill(ds)

        DropDownList3.DataSource = ds
        DropDownList3.DataTextField = ("Line")
        DropDownList3.DataBind()

        ds.Clear()
        cmd.Dispose()
End Sub

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Daniel Van Der Werken

You say there is a repeater in the title but I don't see any repeater defined or code for it in the code behind.

Prakash Samariya

Please check if DataSet fills or not! Error shows "It could not finds the list", and you are trying to assig its' value.

Try below code

<asp:DropDownList ID="DropDownList3" runat="server" OnDataBinding="getLines">/asp:DropDownList>

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Back-End

Protected Sub getLines(sender As Object, e As System.EventArgs)
        Dim DrpList3 As DropDownList = DirectCast(sender, DropDownList)

        Dim cmd As SqlDataAdapter = New SqlDataAdapter("select Line from dbo.production_lines order by Line", cnn)
        Dim ds As DataSet = New DataSet()
        cmd.Fill(ds)

        DrpList3.DataSource = ds
        DrpList3.DataBind()

        ds.Clear()
        cmd.Dispose()
End Sub

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David C

ASKER

Daniel, the repeater is as follows;

<table style="width: 100%;">

                                        <asp:Repeater ID="Repeater1" runat="server">
                                            <HeaderTemplate>

                                                <tr>
                                                    <td>Line</td>
                                                    <td>Role</td>
                                                    <td>Name</td>
                                                    <td>Level</td>
                                                    <td>Present</td>
                                                </tr>

                                            </HeaderTemplate>

                                            <ItemTemplate>
                                                <tr>
                                                    <td>
                                                        <asp:DropDownList ID="DropDownList3" runat="server" DataValueField="Line" SelectedValue='<%#DataBinder.Eval(Container.DataItem, "Line")%>' OnDataBinding="getLines"></asp:DropDownList>
                                                    </td>
                                                    <td>
                                                        <asp:DropDownList ID="DropDownList4" runat="server" DataValueField="Role" SelectedValue='<%#DataBinder.Eval(Container.DataItem, "Role")%>' OnDataBinding="getRoles"></asp:DropDownList>
                                                    </td>
                                                    <td>
                                                        <asp:DropDownList ID="DropDownList5" runat="server" DataValueField="Name" SelectedValue='<%#DataBinder.Eval(Container.DataItem, "Name")%>' OnDataBinding="getNames"></asp:DropDownList>
                                                    </td>
                                                    <td>
                                                        <asp:DropDownList ID="DropDownList6" runat="server" DataValueField="Level" SelectedValue='<%#DataBinder.Eval(Container.DataItem, "Level")%>' OnDataBinding="getLevels"></asp:DropDownList>
                                                    </td>
                                                    <td>
                                                        <asp:CheckBox ID="CheckBox1" runat="server" />
                                                    </td>
                                                </tr>
                                            </ItemTemplate>
                                        </asp:Repeater>
                                    </table>

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ASKER CERTIFIED SOLUTION

David C

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David C

ASKER

Found a workaround without using code behind