Operation not permitted on IsolatedStorageFileStream - windows-phone-7

Question

using (EntityDataContext amdb = new EntityDataContext(StrConnectionString))
{
if (amdb.DatabaseExists())
{
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!isoStore.FileExists(databaseName))
{
copyDatabase = true;
}
else
{
using (IsolatedStorageFileStream databaseStream = isoStore.OpenFile(databaseName, FileMode.Open, FileAccess.Read)) // error here
{
using (Stream db = Application.GetResourceStream(new Uri(databaseName, UriKind.Relative)).Stream)
{
if (databaseStream.Length < db.Length)
copyDatabase = true;
}
}
}
}
}
else
{
//error with the database that has been packaged
}
if (copyDatabase)
new Worker().Copy(databaseName);
}

Answer 1

Check that you precise, in isolated storage access mode parameters, the possibility to write data in there instead of just be able to read.
Did you test with a device?

Answer 2

From what i can tell you're trying to read the database file, while you still have a database connection open. Since the a DataContext locks the database (and thus the file), you're not allowed to read it at the same time.
In order to close the database connection try to close the EntityDataContext object (by calling amdb.Close() or by closing the using statement
Try something like this:
bool shouldCopyDatabase = false;
bool databaseExists = false;
using (EntityDataContext amdb = new EntityDataContext(StrConnectionString))
{
databaseExists = amdb.DatabaseExists();
}
if (databaseExists == true)
{
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!isoStore.FileExists(databaseName))
{
copyDatabase = true;
}
else
{
using (IsolatedStorageFileStream databaseStream = isoStore.OpenFile(databaseName, FileMode.Open, FileAccess.Read)) // error here
{
using (Stream db = Application.GetResourceStream(new Uri(databaseName, UriKind.Relative)).Stream)
{
if (databaseStream.Length < db.Length)
copyDatabase = true;
}
}
}
}
}
if (copyDatabase)
new Worker().Copy(databaseName);
By moving the isolated storage access functionality outside of the using (EntityDataContext amdb = new EntityDataContext(StrConnectionString)) scope, you allow the database connection to be closed first.