System.Windows.Forms.Application.StartupPath Not working in WPF

i have one window application developed in VS 2005 which is running successfully on client side,My question is that now i want to convert this window application in WPF browser based application, so what should i keep in mind to convert this application to wpf applicaton,
One more thing that in Window Application i have used one mdb file which contain database login detail, so on application startup this file is accessed using System.Windows.Forms.Application.StartupPath+@"/filename.mdb", now im just want to test only whether can i login to my application using WPF or not this time it give me this error "Request for the permission of type 'System.Security.Permissions.RegistryPermission, mscorlib, Version=2.0.0.0, Culture=neutral" (hope some one understand my question)

So if any one who understand my question than please show me some way to develop my application on WPF

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Mamta M15y ago
The earlier application was Windows desktop based WPF application? In that case, converting to browser based WPF app wont be very difficult however file handling may cause some issues. I think the web based version of your app is not able to access the local .mdb file hence you are getting that error.