两个窗体之间传递对象

   public ArchiExt ArchiIdGetInfo(string ArchiId)
        {

stringsql="selecta.AddDatetime,a.ArchiId,a.ArchiNumber,a.ArchiName,b.ArchiNameList,c.DeName,a.ArchiBorrowInfo,a.BorrowName,a.ArchiPlace,a.Comment,a.Image from ArchivesInfo a";
sql += " inner join ArchiLB b on a.ArchiList=b.ArchiList";
sql += " inner join Department c on a.DeId=c.DeId where ArchiId= " + ArchiId;
            try
            {
                SqlDataReader objdr = SqlHelp.GetInfo(sql);
                ArchiExt objext = null;
                if (objdr.Read())
                {
                    objext = new ArchiExt()
                    {
                        ArchiId = Convert.ToInt32(objdr["ArchiId"]),
                        ArchiNumber = objdr["ArchiNumber"].ToString(),
                        ArchiName = objdr["ArchiName"].ToString(),
                        cDeName = objdr["DeName"].ToString(),
                        ArchiBorrowInfo = objdr["ArchiBorrowInfo"].ToString(),
                        BorrowName = objdr["BorrowName"].ToString(),
                        ArchiPlace = objdr["ArchiPlace"].ToString(),
                        Comment = objdr["Comment"].ToString(),
                        AddDatetime = Convert.ToDateTime(objdr["AddDatetime"]),
                        bArchiName = objdr["ArchiNameList"].ToString(),

                    };
                }

                return objext;
            }
            catch (Exception ex)
            {
                
                throw new Exception("数据查询错误"+ex.Message);
            }

比如：我在窗体A中有个查询的结果集 根据结果集中的序号来点击修改，就显示数据库中相对应的内容；

首先呢，我们要写个方法返回一个对象，public 对象 get（string 序号）

我们要显示的对象已经出来了，接下来要把对象中的数据现在是另一个窗体中，需要在另一个窗体中写一个带参数的构造方法！完了把对象传递过去，赋值给控件就好了

public partial class FrmModify : Form
    {
        public FrmModify()
        {
            InitializeComponent();
        }
        public FrmModify(ArchiExt objext)
        {
            InitializeComponent();
            this.textBox1.Text = objext.ArchiNumber;
            this.textBox2.Text = objext.ArchiName;
            this.textBox3.Text = objext.BorrowName;
            this.textBox4.Text = objext.ArchiPlace;
            this.textBox5.Text = objext.Comment;
            this.textBox6.Text = objext.cDeName;
            this.textBox7.Text = objext.bArchiName;
            this.dateTimePicker1.Text = objext.AddDatetime.ToString();
            this.textBox8.Text = objext.ArchiBorrowInfo;
           // this.pictureBox1.Image=objext.Image
        }