.Net连接到SAP

//首先的引用下面三个文件
//这几个文件的DLL在C:\Program Files\SAP\FrontEnd\SAPgui
 //具体需要看安装目录
using SAPFunctionsOCX;
using SAPLogonCtrl;
using SAPTableFactoryCtrl;

  private void btnLogin_Click(object sender, EventArgs e)
        {
            //实例化一个SAPControl类的实例。
            SAPLogonCtrl.SAPLogonControlClass Login = new SAPLogonCtrl.SAPLogonControlClass();
            //指定连接SAP的各项参数。
            Login.User = this.txtUser.Text.Trim();
            Login.Password = this.txtUserPwd.Text.Trim();
            Login.Client = this.txtClient.Text.Trim();
            Login.Language = this.txtLanguage.Text.Trim().ToUpper();
            Login.ApplicationServer = this.txtIP.Text.Trim();
            Login.SystemNumber = Convert.ToInt32(this.txtSystemNumber.Text.Trim());
            //New一个连接对象去连接SAP
            SAPLogonCtrl.Connection Conn = (SAPLogonCtrl.Connection)Login.NewConnection();
            //调用Login方法检测是否可以正确登录。
            if (Conn.Logon(null, true))
            {
                MessageBox.Show("连接SAP成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 
                Conn.Logoff();
            }
            else
            {
                MessageBox.Show("连接SAP失败", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
           
        }