How to pass username and password from web application to application?

            try

            {

                PostData MyPostdata = new PostData();

                MyPostdata.Url = "https://www.xyzCompany.com/verification.aspx";

                MyPostdata.Add("UserID", UserID);

                MyPostdata.Add("DistributorCode", DCODE);

                MyPostdata.Add("SessionID", YourSessionID);

                MyPostdata.Post();

            }

            catch { }