On the html side, I've got: <asp:table id="tblMain" runat="server"> ... </asp:table> Now, in the code behind, I need to define the width: tblMain.Width = ??? "700" and 700 and "100%" and 100% don't work. "Value of type "String" can not be converted to System.Web.WebControls.Unit" A couple Google searches have turned up nothing but HTML tutorials. I searched for: asp.net table runat=server define width asp.net <table runat=server asp.net <table runat=server define width in code behind <asp:table Runat="server"> tutorial How do I define the width? Thanks!!!