i am giving code

  string fileurl = cmd.ExecuteScalar().ToString();
        int index = fileurl.LastIndexOf("/");
        string filename = fileurl;
      
        filename = filename.Remove(0, index + 1);
        
       Response.AppendHeader("content-disposition", "attachment; filename=" + filename);
       Response.WriteFile(fileurl);
            Response.ContentType = "Application/pdf";

        Response.End();

In my website, I have different Users, whose information I store in Session variable. I now realised it is not a smart thing to do. I want to know what is the best way to store the login id of users as global variable in ASP.Net

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