Sqlite unsuported file format

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C#

SQL

SQLite

Hi
I have a winforms app in C# witch i completed, but now i want to reduce the dependecies such as sqlserver express.
What i´m trying to do is alter my code from sql server to SQLite.
So i google´d it and followed a tutorial, i made the alterations but i´m having some trouble, can anyone take a look at the code and see what the problem is?
I get the error

An unhandled exception of type 'Finisar.SQLite.SQLiteException' occurred in SQLite.NET.dll
Additional information: unsupported file format

In the line sal_con.Open();

This form is suposed to get the info from a database called db.db (witch i already converted from sql to sqlit format) table "temp" and print it to a crystal reports report.

If i can get this form to work the other forms will be easy to migrate.
Thanks in advance

What I have tried:

OLD CODE:

    public partial class report : Form
    {
        public static SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\BD.mdf;Integrated Security=True;Connect Timeout=30");
        
public report()
        {
            InitializeComponent();
        }
        public void report_Load(object sender, EventArgs e)
        {
            con.Open();
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "select * from temp";
            cmd.ExecuteNonQuery();
            bdDataSet ds = new bdDataSet();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(ds.temp);
            hytherm myReport = new hytherm();
            myReport.SetDataSource(ds);
            crystalReportViewer1.ReportSource = myReport;
            con.Close();

            con.Open();
            SqlCommand cmd2 = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "truncate table dbo.temp";
            cmd.ExecuteNonQuery();
            con.Close();
        }

NEW CODE:

        private void SetConnection()
        {
            sql_con = new SQLiteConnection
                ("Data Source=db.db;Version=3");
        }

        private void ExecuteQuery(string txtQuery)
        {
            SetConnection();
            sql_con.Open();
            sql_cmd = sql_con.CreateCommand();
            sql_cmd.CommandText = txtQuery;
            sql_cmd.ExecuteNonQuery();
            sql_con.Close();
        }
        public void report_Load(object sender, EventArgs e)
        {
            SetConnection();
            sql_con.Open();
            sql_cmd = sql_con.CreateCommand();
            sql_cmd.CommandType = CommandType.Text;
            sql_cmd.CommandText = "select * from temp";



            SQLiteDataAdapter da = new SQLiteDataAdapter(sql_cmd);
            DB.Fill(DS);
            hytherm myReport = new hytherm();
            myReport.SetDataSource(DS);
            crystalReportViewer1.ReportSource = myReport;
            sql_con.Close();

            sql_con.Open();
            sql_cmd = sql_con.CreateCommand();
            sql_cmd.CommandType = CommandType.Text;
            sql_cmd.CommandText = "DELETE FROM table temp";
            sql_cmd.ExecuteNonQuery();
            sql_con.Close();
        }
    }
}