Sql 语句中使用参数

using System;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication2
{
    public class Program
    {
        public static void Main(string[] args)
        {
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = "server=.;database=Database;uid=sa;pwd=******";
            conn.Open();

            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = "INSERT INTO dbo.Records( CorpName, VisitTime ) VALUES ( @CorpName,@VisitTime)";

            cmd.Parameters.Add("@CorpName", SqlDbType.NVarChar).Value = "冲致分公司";
            cmd.Parameters.Add("@VisitTime",SqlDbType.DateTime).Value=DateTime.Now;

            cmd.ExecuteNonQuery();
        }
    }
}