MYSQL+.NET中写SQL语句用参数的方式

using System;
using System.Collections.Generic;
using System.Text;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Data;

namespace testMSQL
...{
    class Program
    ...{
        static void Main(string[] args)
        ...{
            string connString = ConfigurationManager.ConnectionStrings["MySQL"].ConnectionString;

            using (MySqlConnection conn=new MySqlConnection(connString))
            ...{
                try
                ...{
                    MySqlCommand cmd = new MySqlCommand();

                    conn.Open();
                    cmd.Connection = conn;
                    cmd.CommandText="insert into tab (content) values(?content)";
                    cmd.CommandType = CommandType.Text; 
                    cmd.Parameters.AddWithValue("content", "test3");
                    
                    cmd.ExecuteNonQuery();

                }
                catch (Exception)
                ...{
                    
                    throw;
                }
            }
        }
    }
}