Error about converting when not converting

In my backend db I have a field in the table of type datetime. At times this field could recieve a datetime or a null value. So I need to display inside of a datagrid asp.net field the date and time if it is not null. But I need to display it so that the date is on one line and the time right under it. No problem I can do that...however here is the code I have:

Code:

<asp:TemplateColumn SortExpression="3" HeaderText="Target"> <HeaderStyle HorizontalAlign="Center"></HeaderStyle> <ItemStyle Wrap="False" HorizontalAlign="Center" Width="8%"></ItemStyle> <ItemTemplate> <asp:Hyperlink runat="server" CssClass="dgHyperlinks" Text='<%# IIF(Container.DataItem("TargetDate") IS DbNull.Value, DataBinder.Eval(Container.DataItem, "TargetDate", "{0:dd-MMM-yy}"), DataBinder.Eval(Container.DataItem, "TargetDate", "{0:dd-MMM-yy}") + "<br>" + (DataBinder.Eval(Container.DataItem, "OpenDate")).ToShortTimeString()) %>' NavigateUrl='<%# "TicketActions.aspx?TicketID=" & Server.UrlEncode(Container.DataItem("TicketID"))%>' ID="hlTarget"/> </ItemTemplate> </asp:TemplateColumn>

But in some cases I get an error on the page stating:

Code:

An Error Occurred: System.InvalidCastException: Cast from string "21-Jul-06 9:33 AM" to type 'Date' is not valid. at Microsoft.VisualBasic.CompilerServices.DateType.FromString(String Value, CultureInfo culture) at Microsoft.VisualBasic.CompilerServices.DateType.FromString(String Value) at quikfix.jakah.com.facilityhome.dgTickets_ItemDataBound(Object sender, DataGridItemEventArgs e) in \\jakah-iis-2\QuikFix\facilityhome.aspx.vb:line 803 at System.Web.UI.WebControls.DataGrid.OnItemDataBound(DataGridItemEventArgs e) at System.Web.UI.WebControls.DataGrid.CreateItem(Int32 itemIndex, Int32 dataSourceIndex, ListItemType ...

I am not sure why it is trying to convert it to a date? Its supposed to be a template column..How do I go about fixing this ?

Thanks,
Jon