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string str = System.Environment.CurrentDirectory;  
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string str = System.AppDomain.CurrentDomain.BaseDirectory;  
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string str = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;  
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string str = System.Windows.Forms.Application.StartupPath;  
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string str = System.Windows.Forms.Application.ExecutablePath;  
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string str = System.IO.Directory.GetCurrentDirectory();  
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ASP.NET application and page life cycle
Introduction
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Process request using MHPM events fired
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