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Right-click the. aspx file editing area and select View in browser. The default is "public partial class _default:system.web.ui.page" You are not "_" removed.
I infer that you may have installed the VS20.5 first, then installed IIS, you run the project on IIS, you use the file system to open the Web project to try. or run "C:windowsmicrosoft.netframeworkv2.0.50727aspnet_regiis.exe-i" to register IIS to prevent the version or path from being incorrect, you can "start"-> "program"-> " Microsoft Visual Studio-> "Visual Studio Tools"-> "Visual Studio 2005 command Prompt" to open a command prompt line to run "aspnet_regiis.exe-i" directly Try again.
If not, you admin tool configuration IIS, asp.net version if it is 1.1, you change 2.0.