I have a DetailsView with a number of textboxes setup with RequiredFieldValidators.
The code for both is:
<InsertItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("date_time") %>'></asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator11"
runat="server"
ControlToValidate="TextBox1"
ErrorMessage="Please update date_time."
ValidationGroup="InsertDetailsView1">*</asp:RequiredFieldValidator>
</InsertItemTemplate>
The problem is that the validation control is now creating a space (ie
) between the textbox and the one below it. How do I get rid of the space? Is it a CSS thing?

Set this property:
Display="Dynamic".