The name 'someControl' does not exist in the current context
<p>I have some weird problem with asp.net controls.</p>

<p>I am editing a (previously) working page, but when I add a new control, and try to run it, it says:"The name 'xxx' does not exist in the current context".</p>

<p>Also when I rename a working control, on both markup, and code-behind file, it will also give this error for this control.</p>

<p>I did read something about deleting the designer file, and "convert to web application", but I don't have any designer file, nor the option to "convert to web application.".</p>

<p>Does anyone have any suggestions?</p>

<p>Thanks in advance.</p>

<p>Edit: Some example:
<img src="http://i.stack.imgur.com/m7UWs.png" alt="The problem"></p>
