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Stupid web.config mistake: Sections must only appear once per config file by Ken Cox [MVP]

Today’s stupid mistake comes to you via the web.config file in an ASP.NET 4 Web application project. At runtime, when navigating to default.aspx, ASP.NET choked with this error message: Parser Error Message: Sections must only appear once per config file...

‘Schema specified is not valid’ error on Upgrading to ASP.NET 4 by Ken Cox [MVP]

To take advantage of improvements in ASP.NET 4 and Entity Framework 4, I decided to upgrade my ASP.NET 3.5 site to 4.0. Most everything went smoothly except for the following error: Schema specified is not valid. Errors: error 0194: All artifacts loaded...

Expression of type 'System.Data.Linq.Table(Of xxx)' is not queryable by Ken Cox [MVP]

I don't recall getting this error so often in Visual Web Developer 2008 Beta 2 or the release candidate: Expression of type 'System.Data.Linq.Table(Of xxx)' is not queryable. Make sure you are not missing an assembly reference and/or namespace import...
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