[error] controlRenderingCompatibilityVersion' attribute is not declared [modified]
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I'm using Visual Studio 2010 (.NET 3.5), which still has .NET 4.0 installed because I had to uninstall Visual Studio 2010. When I'm loading this code within Visual Studio 2008, an error is being displayed that seems to be triggered by: web.config ... <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"> <controls> <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/></controls></pages> <httpHandlers> ... Errors: 1. Warning 1 C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\CalendarTest.aspx: ASP.NET runtime error: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. (C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\web.config line 28) C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\CalendarTest.aspx 1 1 C:\...\RichControls\ 2. Warning 2 The 'targetFramework' attribute is not declared. C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\Web.config 28 29 C:\...\RichControls\ 3. Warning 3 The 'controlRenderingCompatibilityVersion' attribute is not declared. C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\Web.config 52 10 C:\...\RichControls\ 4. Warning 4 The 'clientIDMode' attribute is not declared. C:\Documents and Settings\Jon\My Documents\Downloads\Beginning_ASP_NET_3_5_in_C_2008_From_Novice_to_Professional_Second_Edition-3790\Beginning ASP.NET 3.5\Chapter11\RichControls\Web.config 52 53 C:\...\RichControls\ 5. Error 5 Unrecognized attribute 'targetFramewo