I’m using the Entity Framework (.NET 4.0) with SQLite as the underlying database and

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Asked: May 26, 20262026-05-26T23:13:09+00:00 2026-05-26T23:13:09+00:00

I’m using the Entity Framework (.NET 4.0) with SQLite as the underlying database and

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I’m using the Entity Framework (.NET 4.0) with SQLite as the underlying database and I get an exception when I try to commit some changes to the database:

The underlying provider failed on Commit.

The stack trace is:

System.Data.EntityException: The underlying provider failed on Commit. ---> System.Data.SQLite.SQLiteException: The database file is locked
database is locked
   at System.Data.SQLite.SQLite3.Step(SQLiteStatement stmt)
   at System.Data.SQLite.SQLiteDataReader.NextResult()
   at System.Data.SQLite.SQLiteDataReader..ctor(SQLiteCommand cmd, CommandBehavi
or behave)
   at System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.SQLite.SQLiteCommand.ExecuteNonQuery()
   at System.Data.SQLite.SQLiteTransaction.Commit()
   at System.Data.EntityClient.EntityTransaction.Commit()
   --- End of inner exception stack trace ---
   at System.Data.EntityClient.EntityTransaction.Commit()
   at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
   at MySystem.MySystemService.UpdateFollowersAndUsers() in C:\Path\To\MySystem\MySystemService.cs:line 295

My code is pretty simple:

// Gets more followers for the competitor and updates the database
List<Follower> moreFollowers = GetMoreFollowers(competitor);

// Add the new followers to the database
using (MySystemEntities db = new MySystemEntities())
{
    try
    {
        foreach (Follower f in moreFollowers)
        {
            db.AddToFollowers(f);
        }
        db.SaveChanges();
    }
    catch (Exception e)
    {
        Console.WriteLine(e.ToString());
    }
}

This snippet of code is inside MyService, it comes in with a batch of 5,000 followers and it’s getting the above exception. However, when I pull the same snippet of code out into the Main function and just manually add a few followers, then it no longer throws the exception and the followers are successfully added to my database. Apparently the database file is locked, what may be causing this issue?