取本页URL地址的方法是（总结）：
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测试的url地址是http://www.test.com/testweb/default.aspx, 结果如下：
Request.ApplicationPath
结果：/testweb
Request.CurrentExecutionFilePath:
结果：testweb/default.aspx
Request.FilePath:
结果：/testweb/default.aspx
Request.Path:
结果：/testweb/default.aspx
Request.PhysicalApplicationPath:
结果：E:\WWW\testweb\
Request.PhysicalPath:
结果：E:\WWW\testweb\default.aspx
Request.RawUrl:
结果：/testweb/default.aspx
Request.Url.AbsolutePath:
结果：/testweb/default.aspx
Request.Url.AbsoluteUri:
结果：http://www.test.com/testweb/default.aspx
Request.Url.Host:
结果：www.test.com
Request.Url.LocalPath:
结果：/testweb/default.aspx
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