MVC Core controller State Managment

[mandloikunal]

I am working on Webhooks Concept. Since Webhooks act like an trigger. It will be firing an event like Update or Insert takes place. Its a MVC application and I have two Controller Home and Webhook Controller. I am passing argument through Query String on Home controller. I have tried Session,TempData, Cookies for passing variable from home to Webhooks HttpContext.Session.SetString("UserName", Request.Query["UserName"].ToString());

and getting session value on webhook controller

HttpContext.Session.GetString("UserName");

Also tried the same for TempData

Issue is On webbooks Controller its coming null.

I need to store parameter (User Name ,password) and reused the same for database related operation

Kindly guide