Simple Code : how to use ExecuteNonQuery in c#

SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");

    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.CommandText ="INSERT INTO Employee (ID, FirstName) VALUES (" +
      "  9, 'Jason')";

    mySqlConnection.Open();

    int numberOfRows = mySqlCommand.ExecuteNonQuery();
    Console.WriteLine("Number of rows added = " + numberOfRows);
    DisplayRow(mySqlCommand, "9");

    mySqlCommand.CommandText = "UPDATE Employee SET FirstName = 'New' WHERE ID = '9'";

    numberOfRows = mySqlCommand.ExecuteNonQuery();
    Console.WriteLine("Number of rows updated = " + numberOfRows);
    DisplayRow(mySqlCommand, "9");

    mySqlCommand.CommandText ="DELETE FROM Employee WHERE ID = '9'";

    numberOfRows = mySqlCommand.ExecuteNonQuery();
    Console.WriteLine("Number of rows deleted = " + numberOfRows);

    mySqlConnection.Close();

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