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I have an ASP.NET 3.5 GridView containing a list of Documents.
When I had all fields within the Gridview including the Select drop-down to select for which States are covered each Document - it worked.

Trying to make it easier to use, I moved the row details to a DetailsView - and then a FormsView - neither types will show the selected previously assigned States for a record.

I have tried the ItemCreated and DataBound events - the EditItemTemplate States control can only be found in the ItemCreated event. I initially had ObjectDataSource DataSourceId binding, but also tried manual binding within the ItemCreated event (to ensure it was there it added states - then iterating through the states and selecting them.

They DO show as selected within the control on exit from ItemCreated event - but when shown on the page - nothing is selected.
(If I select new States and Update - it does save the new ones and show them the ItemTemplate dStateList label.)

How can I get the StateList ListBox to retain the selected states and show them in Edit?

protected void DocumentDetail_DataBound(Object sender, EventArgs e)

 if (gvDocumentList.SelectedValue == null)
 return;
 int id = (int)gvDocumentList.SelectedValue;
 if (DocumentDetail.CurrentMode == FormViewMode.Edit)
 
 //HtmlSelect selListStateList = (HtmlSelect)DocumentDetail.FindControl("seselStateList");
 ListBox selListStateList = (ListBox)DocumentDetail.FindControl("lbselStateList");
 if (selListStateList != null)
 
 // NEVER Hits - selListStateList is always null
 DataSet states = States(); // Get full list of all states
 selListStateList.DataSource = states;
 selListStateList.DataBind();
 // Set selected states from list
 List<string> listOfStates = AdministrationService.GetDMStatesForDoc(id);
 foreach (string state in listOfStates)
 
 selListStateList.Items.FindByValue(state).Selected = true;
 
 
 



protected void DocumentDetail_ItemCreated(Object sender, EventArgs e)

 if (gvDocumentList.SelectedValue == null)
 return;
 int id = (int)gvDocumentList.SelectedValue;
 // Get List of states for this document
 List<string> listOfStates = GetStatesForDoc(id);
 if (DocumentDetail.CurrentMode == FormViewMode.ReadOnly)
 
 Label stateList = DocumentDetail.FindControl("dStateList") as Label;
 if (stateList != null)
 
 if (listOfStates.Count > 0)
 
 stateList.CssClass = "";
 stateList.Text = string.Join(", ", listOfStates.ToArray());
 
 else
 
 stateList.CssClass = "bg-danger text-white";
 stateList.Text = "None Selected";
 
 
 
 else
 
 //HtmlSelect selListStateList = (HtmlSelect)DocumentDetail.FindControl("seselStateList");
 ListBox selListStateList = (ListBox)DocumentDetail.FindControl("lbselStateList");
 if (selListStateList != null)
 
 // THIS DOES Hit
 DataSet states = States();
 selListStateList.DataSource = states;
 selListStateList.DataBind();
 // Set selected states from list
 foreach (string state in listOfStates)
 
 // THIS Does find and set selected on correct items
 selListStateList.Items.FindByValue(state).Selected = true;
 
 
 


<asp:FormView ID="DocumentDetail" AutoGenerateRows="False" EmptyDataText="Select Document to view Details" 
 DataKeyNames="Id" DataSourceID="odsDocument" CssClass="table-sm table-borderless table-striped rounded-top w-100"
 OnItemCreated="DocumentDetail_ItemCreated" BorderStyle="None" BorderWidth="0px" 
 OnItemUpdated="DocumentDetail_ItemUpdated"
 OnItemUpdating="DocumentDetail_ItemUpdating"
 OnItemDeleted="DocumentDetail_ItemDeleted" 
 OnModeChanged="DocumentDetail_ModeChanged" 
 OnDataBinding="DocumentDetail_DataBound"
 runat="server">
 <ItemTemplate>
 <table>
 <tr>
 <td>
 <asp:LinkButton ID="EditButton" Text="Edit" CommandName="Edit" RunAt="server"/>
 &nbsp;
 <asp:LinkButton ID="DeleteButton" Text="Delete" CommandName="Delete" RunAt="server"/>
 </td>
 </tr>
 <tr>
 <th style="width:50%">Document Name</th>

 </tr>
 <tr>
 <td><asp:Label ID="lblDocumentName" Width="100%" runat="server" Text='<%# Eval("DocumentName") %>'></asp:Label></td>
 </tr>
 <tr>
 <th>State List</th>
 </tr>
 <tr>
 <td>
 <asp:Label ID="dStateList" Style="width: 90%;" runat="server"></asp:Label>
 </td>
 </tr>
 </table>
 </ItemTemplate>
 <EditItemTemplate>
 <table>
 <tr>
 <td>
 <asp:LinkButton ID="UpdateButton" Text="Update" CommandName="Update" RunAt="server"/>
 &nbsp;
 <asp:LinkButton ID="CancelButton" Text="Cancel" CommandName="Cancel" RunAt="server"/>
 </td>
 </tr>
 <tr>
 <th>Document Name</th>
 </tr>
 <tr>
 <td><asp:TextBox ID="etbDocumentName" CssClass="form-control" runat="server" Text='<%# Bind("DocumentName") %>'></asp:TextBox></td>
 </td>
 </tr>
 <tr>
 <th>State List</th>
 </tr>
 <tr>
 <td> 
 <asp:ListBox ID="lbselStateList" CssClass="form-control multiselect" SelectionMode="Multiple"
 DataTextField="Long_State" DataValueField="State"
 runat="server"></asp:ListBox>
 </td>
 </tr>
 </table>
 </EditItemTemplate>
</asp:FormView>

<script type="text/javascript">
 $(document).ready(function() 
 $('.multiselect').multiselect(
 includeSelectAllOption: true,
 maxHeight: 400,
 buttonWidth: '250px',
 nonSelectedText: 'Select state(s)',
 allSelectedText: 'All selected'
 );
 );
</script>