C#中调用远程桌面时全屏的问题

            RDP1.Dock =DockStyle.None;
            RDP1.Left = 0;
            RDP1.Top = 0;
            RDP1.Width =Screen.PrimaryScreen.Bounds.Width;
            RDP1.Height =Screen.PrimaryScreen.WorkingArea.Height;
          
            string key = "8位key";
            string iv = "8位iv";
            string ip =Main.IPAddress;
            string user =Main.User;
            string pwd =Main.Pwd;
            this.Text = ip + ": 远程桌面连接";
            RDP1.Server =ip;
            if (user != "" && pwd != "") {
                pwd=hr.DESDecrypt(pwd,key,iv);
                RDP1.UserName =user;
                IMsTscNonScriptable secured =(IMsTscNonScriptable)RDP1.GetOcx();
                secured.ClearTextPassword =pwd;
            }
            RDP1.Connect();