Dropdownlists In DetailsView

Dark-Star · June 21st, 2015, 05:43 PM

I have 2 dropdownlists in a detailsview. One dropdownlist filters the others listitems.

My issue is that I can not figure out how to insert a -1 or 0 value for the top menu text.

Here is the html:

Code:

<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DefaultMode="Insert">
        <Fields>
            <asp:TemplateField HeaderText="Operating System" SortExpression="OperatingSystem" HeaderStyle-Width="225">
                <InsertItemTemplate>
                    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" DataSourceID="SqlDataSource2" DataTextField="OperatingSystem" DataValueField="Id" AppendDataBoundItems="true" Width="210px">
                        <asp:ListItem Value="-1">-- Select Operating System --</asp:ListItem>
                    </asp:DropDownList>
                </InsertItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("OperatingSystem") %>'></asp:Label>
                </ItemTemplate>

            <asp:CommandField ShowInsertButton="False" />
        </Fields>
    </asp:DetailsView>

You can see here the reloading of the second dropdownlist:

Code:

protected void dvDropDownList2Model_DataBound(object sender, EventArgs e)
        {

            DropDownList DropDownList2Model = (DropDownList)sender;

            DetailsView DetailsView1 = (DetailsView)DropDownList2Model.NamingContainer;

            if (DetailsView1.DataItem != null)
            {

                string strModel = ((DataRowView)DetailsView1.DataItem)["Id2"] as string;

                ListItem lm = DropDownList2Model.Items.FindByValue(strModel);

                
                //DropDownList2Model.Items.Add(new ListItem("Select Model", "-1"));

                
                if (lm != null) lm.Selected = true;

            }

I have tried many approaches to insert/add the item (this is one of MANY):

Code:

DropDownList2Model.Items.Insert(0, "<-- Select -->");

How can I get this into the dropdownlist view?

Imar · June 25th, 2015, 05:34 PM

Something like this should work:

DropDownList2Model.Items.Add(new ListItem("Select Model", "-1"));

This adds it at the end though. Instead, Insert with a ListItem and pass 0 for the index parameter.

Hope this helps,

Imar

Dark-Star · June 27th, 2015, 12:45 AM

Thanks Imar!

Your always there for me when I reach a wall I can't figure out