Controls on aspx page can't be accessed from code-behind

i have the following probl开发者_开发知识库em: i work in web application and only today. any control i put on the page, when trying to access it from behind code. it doesn't appear at all. what are the probabilities and reasons for this problem. note: i work from a thin client. they make some maintenance on their server today. and after that i find this problem.

the previous controls on my page can be accessed normally with out any problems.

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See if the controls have an ID this might sound stupid but perhaps yesterday someone created the view with a snippet label *tab *tab and forgot to add an id

Below result of label *tab *tab ..

 <asp:Label Text="text" runat="server" />

Should be

 <asp:Label Text="text" ID="lblInfo" runat="server" />

Else check the attributes of the page / controls / codebehindfile

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make sure the CodeBehindFile attributes are set correctly

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see if run at server attribute is properly set on new controls