Forms Data Controls :: When Casting From A Number, The Value Must Be A Number Less Than Infinity

The following code gives error: "When casting from a number, the value must be a number less than infinity."

<asp:TemplateField HeaderText="DATE" SortExpression="date1">
<ItemTemplate>
<asp:Calendar ID="Calendar1" runat="server"
SelectedDate='<%# Bind("date1") %>' VisibleDate='<%# Eval("date1") %>'>
</asp:Calendar>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="Date1" runat="server" Text='<%# Bind("date1") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>

The error occurs at the line <asp:Calendar ID="Calendar1"...>

It errors because there are records with null value for date1 when the records are returned from the database.

Is there a way to specify in the .aspx file telling it to ignore null or display null/blank?