I got the following structure in my design:
UpdatePanel, within it an AjaxTabContainer, within it an AjaxTabPanel, within it an ASP FormView and finally within it a Drop Down List
My application is made with a 3-tier architecture and my drop down list's data source is actually a Data Table that is returned by the Business Logic Class.
My problem:
- My drop down list doesn't show any data after the page is loaded.
My trials:
I created two events in my drop down list "OnDataBound" and "OnPreRender" to check where i lose my data.
In debug mode, on data bind i found that the list collection for the drop down list exists
However, on pre-render the drop down list shows that "No Enumerations Exist" and no collection exists.
My Code:
I have the following design for a TabControl
<asp:UpdatePanel ID="UpdtPnlRefugeeInfo" runat="server">
<ContentTemplate>
<ajaxcontrol:TabContainer ID="tabInfoPanel" runat="server" Style="visibility: visible;">
<ajaxcontrol:TabPanel runat="server" ID="PnlBasicInfo">
<HeaderTemplate>
Basic Info
</HeaderTemplate>
<ContentTemplate>
<asp:FormView runat="server" ID="FormViewBasicInfo" DataSourceID="SQLInfoDashboard" OnDataBound="FormViewBasicInfo_DataBound" Width="100%">
<ItemTemplate>
<table runat="server" id="EditTable" style="width: 100%">
<tr>
<td class="mytdlabel">
<asp:Label CssClass="mylabel" runat="server" ID="lblGender" Text="Gender"></asp:Label>
</td>
<td class="mytddata">
<asp:DropDownList CssClass="mydropdown" ID="DDLGender" runat="server" OnDataBound="DDLGender_DataBound" OnPreRender="DDLGender_PreRender"></asp:DropDownList>
</td>
Code Behind:
protected void Page_Load(object sender, EventArgs e)
{
BLREOptions = new BusinessLogic.BLREOptions(); // this is my business logic class
DDLGender = ((DropDownList)FormViewBasicInfo.FindControl("DDLGender"));
tabInfoPanel.ActiveTab = tabInfoPanel.Tabs[0];
FormViewBasicInfo.DataBind();
LoadDDLs();
}
protected void LoadDDLs()
{
DDLGender.DataSource = BLREOptions.getGenderList();
DDLGender.DataValueField = "OptionValue";
DDLGender.DataTextField = "OptionName";
DDLGender.DataBind();
}
protected void DDLGender_DataBound(object sender, EventArgs e)
{
// The List is found here
}
protected void DDLGender_PreRender(object sender, EventArgs e)
{
// the list is not found here
}
