I'm trying to use a databound dropdown list in a grid view.  I can't
seem to get this to work.  If I Bind on a text box it works fine.
Otherwise I get the error below

'ddlDisplayArt' has a SelectedValue which is invalid because it does
not exist in the list of items.
Parameter name: value
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: 'ddlDisplayArt'
has a SelectedValue which is invalid because it does not exist in the
list of items.
Parameter name: value

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace
below.

Stack Trace:


[ArgumentOutOfRangeException: 'ddlDisplayArt' has a SelectedValue
which is invalid because it does not exist in the list of items.
Parameter name: value]
 
System.Web.UI.WebControls.ListControl.PerformDataBinding(IEnumerable
dataSource) +1822067
   System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e)
+104
   System.Web.UI.WebControls.ListControl.PerformSelect() +31
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
   System.Web.UI.Control.DataBindChildren() +216
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +216
   System.Web.UI.Control.DataBind() +12
   System.Web.UI.Control.DataBindChildren() +216
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +216
   System.Web.UI.Control.DataBind() +12
   System.Web.UI.WebControls.GridView.CreateRow(Int32 rowIndex, Int32
dataSourceIndex, DataControlRowType rowType, DataControlRowState
rowState, Boolean dataBind, Object dataItem, DataControlField[]
fields, TableRowCollection rows, PagedDataSource pagedDataSource) +221
   System.Web.UI.WebControls.GridView.CreateChildControls(IEnumerable
dataSource, Boolean dataBinding) +3004
 
System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable
data) +59
   System.Web.UI.WebControls.GridView.PerformDataBinding(IEnumerable
data) +11
 
System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable
data) +111
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments
arguments, DataSourceViewSelectCallback callback) +29
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
   System.Web.UI.WebControls.GridView.DataBind() +4
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound()
+82
 
System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls()
+69
   System.Web.UI.Control.EnsureChildControls() +87
   System.Web.UI.Control.PreRenderRecursiveInternal() +41
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +161
   System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+1360


Here's the code

<%@ Page Language="C#" MasterPageFile="~/Admin/AdminMasterPage.master"
AutoEventWireup="true" CodeFile="ManageArtists.aspx.cs"
Inherits="Admin_ManageArtists" Title="Turning Point Gallery - Artist
Administration" StylesheetTheme="Admin_Theme" %>
<asp:Content ID="cntMain" ContentPlaceHolderID="cphMain"
Runat="Server">
<asp:ObjectDataSource ID="odsArtists"
TypeName="TurningPointGalleryTableAdapters.ArtistTableAdapter"
runat="server"
	SelectMethod="GetArtists" UpdateMethod="Update" DeleteMethod="Delete"
InsertMethod="Insert"
	OldValuesParameterFormatString="original_{0}"   >
	<InsertParameters>
		<asp:Parameter Name="FirstName" Type="string" />
		<asp:Parameter Name="LastName" Type="string" />
		<asp:Parameter Name="DisplayName" Type="string" />
		<asp:Parameter Name="Profile" Type="string" />
		<asp:Parameter Name="DisplayArtId" Type="int32" />
	</InsertParameters>
	<UpdateParameters>
		<asp:Parameter Name="Original_ArtistId" Type="Int32" />
		<asp:Parameter Name="ArtistId" Type="int32" />
		<asp:Parameter Name="FirstName" Type="string" />
		<asp:Parameter Name="LastName" Type="string" />
		<asp:Parameter Name="DisplayName" Type="string" />
		<asp:Parameter Name="Profile" Type="string" />
		<asp:Parameter Name="DisplayArtId" Type="int32" />
	</UpdateParameters>
	<DeleteParameters>
		<asp:Parameter Name="Original_ArtistId" Type="int32" />
	</DeleteParameters>
</asp:ObjectDataSource>

<asp:ObjectDataSource ID="odsAllArtwork"
TypeName="TurningPointGalleryTableAdapters.ArtworkTableAdapter"
runat="server" SelectMethod="GetArtwork" />

<asp:ObjectDataSource ID="odsArtwork"
TypeName="TurningPointGalleryTableAdapters.ArtworkTableAdapter"
	runat="server" SelectMethod="GetArtworkByArtistId"
InsertMethod="Insert" UpdateMethod="Update" DeleteMethod="Delete"
	OldValuesParameterFormatString="original_{0}">
	<SelectParameters>
		<asp:ControlParameter Name="ArtistId" ControlID="grdArtists"
PropertyName="SelectedValue" />
	</SelectParameters>
	<InsertParameters>
		<asp:Parameter Name="ImageURL" Type="string" />
		<asp:Parameter Name="Title" Type="string" />
		<asp:Parameter Name="Height" Type="int32" />
		<asp:Parameter Name="Width" Type="int32" />
		<asp:Parameter Name="Depth" Type="int32" />
		<asp:Parameter Name="Blurb" Type="string" />
		<asp:Parameter Name="ArtistId" Type="int32" />
	</InsertParameters>
	<UpdateParameters>
		<asp:Parameter Name="ArtworkId" Type="Int32" />
		<asp:Parameter Name="Original_ArtworkId" Type="Int32" />
		<asp:Parameter Name="ImageURL" Type="string" />
		<asp:Parameter Name="Title" Type="string" />
		<asp:Parameter Name="Height" Type="int32" />
		<asp:Parameter Name="Width" Type="int32" />
		<asp:Parameter Name="Depth" Type="int32" />
		<asp:Parameter Name="Blurb" Type="string" />
		<asp:Parameter Name="ArtistId" Type="int32" />
	</UpdateParameters>
	<DeleteParameters>
		<asp:Parameter Name="Original_ArtworkId" Type="Int32" />
	</DeleteParameters>
</asp:ObjectDataSource>


<asp:Label CssClass="sectionHeader" ID="lblArtists"
runat="server">Artists</asp:Label>
<asp:GridView ID="grdArtists" DataSourceID="odsArtists" runat="server"
AutoGenerateColumns="False"
	OnRowCommand="grdArtists_RowCommand" DataKeyNames="ArtistId"
AllowSorting="True"
OnSelectedIndexChanged="grdArtists_SelectedIndexChanged" >
	<Columns>
			<asp:CommandField ShowInsertButton="True" ShowEditButton="True"
ShowDeleteButton="True" ShowSelectButton="True" />
			<asp:BoundField DataField="ArtistId" HeaderText="Artist Id"
SortExpression="ArtistId" />
			<asp:BoundField DataField="FirstName" HeaderText="First Name"
SortExpression="FirstName" />
			<asp:BoundField DataField="LastName" HeaderText="Last Name"
SortExpression="LastName" />
			<asp:BoundField DataField="DisplayName" HeaderText="Display Name"
SortExpression="DisplayName" />
			<asp:BoundField DataField="Profile" HeaderText="Profile"
SortExpression="Profile" />
			<asp:BoundField DataField="DisplayArtId" HeaderText="DisplayArtId"
SortExpression="DisplayArtId" Visible="False" />
<%-- THIS WORKS --%>
			<%--<asp:TemplateField>
				<ItemTemplate>
					<asp:TextBox ID="textbox1" Text='<%# Bind("DisplayArtId") %>'
runat="server" />
				</ItemTemplate>
				<EditItemTemplate>
					<asp:TextBox ID="textbox1" Text='<%# Bind("DisplayArtId") %>'
runat="server" />
				</EditItemTemplate>
			</asp:TemplateField>--%>

<%-- THIS DOES NOT --%>
			<asp:TemplateField HeaderText="Display Art"
SortExpression="DisplayArtId">
				<EditItemTemplate>
					<asp:DropDownList ID="ddlDisplayArt" AppendDataBoundItems="True"
SelectedValue='<%# Bind("DisplayArtID") %>'
DataSourceID="odsAllArtwork" DataValueField="ArtworkId"
Enabled="true"  DataTextField="Title" runat="server" >
						<asp:ListItem Text="None" Value="0" />
					</asp:DropDownList>
				</EditItemTemplate>
				<ItemTemplate>
					<asp:DropDownList ID="ddlDisplayArt" AppendDataBoundItems="True"
SelectedValue='<%# Bind("DisplayArtID") %>'
DataSourceID="odsAllArtwork" DataValueField="ArtworkId"
Enabled="false" DataTextField="Title" runat="server" >
						<asp:ListItem Text="None" Value="0" />
					</asp:DropDownList>
				</ItemTemplate>
			</asp:TemplateField>
	</Columns>
<EmptyDataTemplate>
	<asp:DetailsView ID="dtlArtists" DataSourceID="odsArtists"
runat="server" AutoGenerateInsertButton="false"
AutoGenerateRows="false"
		DefaultMode="Insert" OnItemInserted="dtlArtists_ItemInserted"
DataKeyNames="ArtistId" OnModeChanged="dtlArtists_ModeChanged">
		<Fields>
			<asp:BoundField DataField="FirstName" HeaderText="First Name"
SortExpression="FirstName" />
			<asp:BoundField DataField="LastName" HeaderText="Last Name"
SortExpression="LastName" />
			<asp:BoundField DataField="DisplayName" HeaderText="Display Name"
SortExpression="DisplayName" />
			<asp:BoundField DataField="Profile" HeaderText="Profile"
SortExpression="Profile" />
			<asp:BoundField DataField="DisplayArtId" HeaderText="Display Art
Id" SortExpression="DisplayArtId" />
			<asp:CommandField ShowCancelButton="true" ShowInsertButton="true" /

>

		</Fields>
	</asp:DetailsView>
</EmptyDataTemplate>
</asp:GridView>

<asp:Label CssClass="sectionHeader" ID="lblArtwork"
runat="server">Artwork</asp:Label>
<asp:GridView ID="grdArtwork" DataSourceID="odsArtwork" runat="server"
AutoGenerateColumns="false"
	OnRowCommand="grdArtwork_RowCommand" DataKeyNames="ArtworkId"
AllowSorting="True" Visible="false">
		<Columns>
		<asp:CommandField ShowInsertButton="true" ShowEditButton="true"
ShowDeleteButton="true" ShowSelectButton="True" />
			<asp:BoundField DataField="ArtworkId" HeaderText="Artwork Id"
SortExpression="ArtworkId" />
			<asp:BoundField DataField="ImageURL" HeaderText="Image URL"
SortExpression="ImageURL" />
			<asp:BoundField DataField="Title" HeaderText="Artwork Title"
SortExpression="Title" />
			<asp:BoundField DataField="Height" HeaderText="Height"
SortExpression="Height" />
			<asp:BoundField DataField="Width" HeaderText="Width"
SortExpression="Width" />
			<asp:BoundField DataField="Depth" HeaderText="Depth"
SortExpression="Depth" />
			<asp:BoundField DataField="Blurb" HeaderText="Blurb"
SortExpression="Blurb" />
			<asp:BoundField DataField="ArtistId" HeaderText="Artist Id"
SortExpression="ArtistId" />
		</Columns>
<EmptyDataTemplate>
	<asp:DetailsView ID="dtlArtwork" runat="server"
DataSourceID="odsArtwork"
		DefaultMode="Insert"  OnItemInserted="dtlArtwork_ItemInserted"
OnModeChanged="dtlArtwork_ModeChanged" DataKeyNames="ArtworkId"
AutoGenerateRows="false" >
		<Fields>
			<asp:BoundField DataField="ImageURL" HeaderText="Image URL"
SortExpression="ImageURL" />
			<asp:BoundField DataField="Title" HeaderText="Artwork Title"
SortExpression="Title" />
			<asp:BoundField DataField="Height" HeaderText="Height"
SortExpression="Height" />
			<asp:BoundField DataField="Width" HeaderText="Width"
SortExpression="Width" />
			<asp:BoundField DataField="Depth" HeaderText="Depth"
SortExpression="Depth" />
			<asp:BoundField DataField="Blurb" HeaderText="Blurb"
SortExpression="Blurb" />
			<asp:BoundField DataField="ArtistId" HeaderText="Artist Id"
SortExpression="ArtistId" />
			<asp:CommandField ShowCancelButton="true" ShowInsertButton="true" /

>

		</Fields>
	</asp:DetailsView>
</EmptyDataTemplate>
</asp:GridView>
</asp:Content>