Need to access file content from class file of C# web Application

I am trying read an email template from the background job which has been written in class file. I tried to use HttpContext.Current.Server.MapPath("~/path") but it did not work as HttpContext is not valid.

Also I tried to use System.Web.Hosting.HostingEnvironment.MapPath("~/path") and I am getting path but it's throwing error as could not find file. Our application is hosted in shared hosting.

Any idea how can I read file content from class file in C# Web Application.