I Can update my Sqlite DataBase only on time , how to get over this?

as the topic name i can only update My SQLite DB only on time i use this Code to Generate the Database and it's Table

    public static void GenDB()
    {
        if (!System.IO.File.Exists("Key.sqlite"))
        {
            SQLiteConnection.CreateFile("Key.sqlite");
            SQLiteConnection m_dbConnection;
            m_dbConnection =
  new SQLiteConnection("Data Source=Key.sqlite;Version=3;");
            m_dbConnection.Open();
            string createTableQuery = @"CREATE TABLE IF NOT EXISTS [MyKey] (
                      [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                      [Key] VARCHAR(2048)  NULL
                      )";
            SQLiteCommand command = new SQLiteCommand(createTableQuery, m_dbConnection);
            command.ExecuteNonQuery();
            try
            {
                SQLiteConnection dbConnection;
                dbConnection =
                new SQLiteConnection("Data Source=Key.sqlite;Version=3;");
                string sql = "insert into MyKey (Key) values ('yourkey')";
                SQLiteCommand commmand = new SQLiteCommand(sql, dbConnection);
                dbConnection.Open();
                commmand.ExecuteNonQuery();
                MessageBox.Show("Done");
            }
            catch
            {
                MessageBox.Show("Error with adding to item to your Database ");
            }


        }

and this worked prefect .. the problem in this

        try
        {
            string con = "Data Source=Key.sqlite;Version=3;";
            SQLiteConnection updata = new SQLiteConnection(con);
            updata.Open();
            string sql = "UPDATE MyKey SET Key=('" + Textbox + "') WHERE ID=1";
            SQLiteCommand commmand = new SQLiteCommand(sql, updata);
            commmand.ExecuteNonQuery();
            MessageBox.Show("Done");
        }
        catch
        {
            MessageBox.Show("Error with updata to sql lite ");
        }

it's work for the first time .. and when i try to build it again i get error with update to DB.