reference to a non-shared member requires an object reference

Dear Gurus,

I have the above mentioned error on the following code:-

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

But I have no problem compiling my asp.net in visual web developer. But after I add a textbox to my page and adjust the width & length of the textbox. I have problem compiling the asp page. If I don't adjust the width & length of the textbox. It has no problem compiling the asp page

Why this happen? how do i resolve it? thanks in advance

garf