Why is an exception thrown when trying to declare a SQLiteConnection?

Question

SQLite

It crashes on the line marked with a comment, the file is being created, the path is correct, many extensions have been tried (*.sqlite, *.db, *db3, etc.).
Here is the code:

if (File.Exists(savepath))
            {
                File.Delete(savepath);
            }
            SQLiteConnection.CreateFile(savepath);
            SQLiteConnection connection = new SQLiteConnection(); //исключение
            connection.ConnectionString = (String.Format("Data Source = {0}; Vesion = 3;",savepath));

Answer 1

Solution: Include System.Windows.Forms

Answer 2

What's the exception, what's the error message?
Now tried "empty project" with one line:
No exceptions were thrown.