not using System.Linq

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I get an error message every time I test ASP.NET pages:The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)I have installed the .NET framework, but I think the installation wasn't complete. Is that the reason? And how do I install the full framework (I don't have an "Application server" option on the windows component wizard, and I get an error message when I try to install the framework again).