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A database with the same name exists, or specified file cannot be opened, or it is located on UNC share

Error In Sql Server 

Unable to open the physical file "C:\inetpub\wwwroot\BknSample\App_Data\BknIIS.mdf". Operating system error 5: "5(Access is denied.)".
An attempt to attach an auto-named database for file C:\inetpub\wwwroot\BknSample\App_Data\BknIIS.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.


Solution :

Here is Permanent Solution of this Problem:

Point 1: 
Make sure U have Database.mdf file under app_data directory if you are using |DataDirectory| in the Connection String.

Point 2:
string connstring = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True";

I hope this will solve your Problem.
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