怎样用代码连接两个Windows窗体

protected void Submit_Click(object sender, EventArgs e)
    {
        string arg = ((Button)sender).CommandArgument;
        if (arg.Equals("1"))
        {
            //抛出DivideByZeroException 异常
            int x = System.Convert.ToInt32(TextBox1.Text);
            int y = System.Convert.ToInt32(TextBox2.Text);
            int z = x / y;
            TextBox3.Text = z.ToString(); 
        }
        else if (arg.Equals("2"))
......................

cs ①

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Acction;
using System.Data;

public partial class Query_Business : System.Web.UI.Page
......................

cs ①

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Acction;
using System.Data;

public partial class Query_Business : System.Web.UI.Page
......................

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace 猜数V2._
{
    public partial class Form1 : Form
    {
......................

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using BLL;
using Acction;
using System.Data;
using PublicClass;

public partial class _Default : System.Web.UI.Page 
......................

表
IF EXISTS (SELECT * FROM sys.objects WHERE object_id =object_id ('Cooperation') AND type IN ('U'))
DROP TABLE Cooperation
GO 

CREATE TABLE Cooperation
(
    ID int identity(1,1) NOT NULL,                      --**
    F_Name varchar (100)    NOT NULL,                   --First Name
    L_Name varchar (100)    NOT NULL,                   --Last Name
    Email varchar(100) NOT NULL,                        --Email联系方式
    Co_Content varchar(3000) NOT  NULL,                 --合作内容
......................

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public class Ac_Contact
    {
        public string strconn = System.Configuration.ConfigurationManager.AppSettings["DataBase"].ToString();
        public int  Contact_Insert(Contact tact)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("insert into Message(Country,Com_Name,Website,Com_Address,Title,Con_Name,Tel,Email,Message,Busi_Type) ");
            sb.Append("values(");
            sb.Append("'" + tact.Country + "',");
            sb.Append("'" + tact.CompanyName + "',");
            sb.Append("'" + tact.Website + "',");
            sb.Append("'" + tact.CompanyAddress + "',");
......................

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