Exception:Failde to update the database "database name" because database is read only.

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WPF

database

setup

exceptions

I have developed a simple WPF application in visual studio 2010.

Then i created it's setup. Steps to build setup are as follow:
1)Created a new project for deployment(Named Setup1).
2)Then i copied all files from the Bin folder of my WPF application and Pasted all files in Application Folder of deployment project.
3)Build Setup1.
4)Then i install the Setup1.msi (That was in Bin folder of Setup1 deployment project).
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After installation of Setup1.

1)I can retreive the database from database.
2)But it generate exception Exception:Failde to update the database "database name" because database is read only. When i try to insert data into the database.
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My connection string is:

string connectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename="+Directory.GetCurrentDirectory().ToString()+
@"\tryDatabase.mdf;Integrated Security=True;User Instance=True";

How can i solve this problem?