Lately my Designer.cs class code-behind has not been regenerating correctly.

 Every so often it will just stop regenerating at all.  I can remove my sqlDataSource objects, and it will regenerate for all other controls on the page, but once I have my sqlDataSource back in, it won't regenerate anything.

 This means none of the controls I add are actually accessible in the code-behind file.

 I assume this is an easily solvable issue - but can't find any documentation on it.

ANY help or tips would be appreciated, even if its a shot in the dark.

any help or information regarding the designer class not regenerating in general?  I don't even know where to start with this...

 All I know is if I remove the sqldatasource's from the markup file, it regenerates fine, but once they're back in, it stops regenerating.