using(SqlCommand command = new SqlCommand(query, connection))

    {

        command.Parameters.AddWithValue("@id", "abc");

        command.Parameters.AddWithValue("@username", "abc");

        command.Parameters.AddWithValue("@password", "abc");

        command.Parameters.AddWithValue("@email", "abc");

​

        connection.Open();

        int result = command.ExecuteNonQuery();

​

        // Check Error

        if(result < 0)

            Console.WriteLine("Error inserting data into Database!");

    }