how to control a windows application using another applicati

[HttpPost]
public ActionResult Login(MST_Users login)
{
string UserName = login.UserName;
string Password = login.Password;

var client = new HttpClient();
var response = client.PostAsJsonAsync("http://localhost:1724/api/LoginAPI", login).Result;



if (response.IsSuccessStatusCode)
{
var content = response.Content.ReadAsStringAsync().Result;
var MySessionVal = JObject.Parse(content).Descendants().ToArray();
SessionManager.UserID = Convert.ToInt32(((Newtonsoft.Json.Linq.JValue)(MySessionVal[5])).Value);
SessionManager.UserTypeID = Convert.ToInt32(((Newtonsoft.Json.Linq.JValue)(MySessionVal[7])).Value);
SessionManager.UserName =Convert.ToString((Newtonsoft.Json.Linq.JValue)(MySessionVal[8]).First);

return RedirectToAction("Index", "Home");
}
else
{
ViewBag.Message = "Wrong Username or Password";
return RedirectToAction("Login", "Logins");
}


}