How to add "Username" under logo after login.

I’m trying to add a “Username” under the image logo of my webpage after User login.

I want to add Session variable here to capture the username and after that want to call the “Session” value in the html code under the logo of my webpage.

My C# file code (Main.cs) file name

: [ModuleMethodAttribute(Require_Post = true)]

public string Auth(string Username, string Password, string CompanyRpt)

{

AuthenticationRequest Login = new AuthenticationRequest();

Login.Username = Username;

Login.Password = Password;

if (Result.Authenticated)

{

Result.Commit();

Instance.Session.Add("CompanyRpt", CompanyRpt);

HttpContext.Current.Response.Redirect("/index.html");

return "";

}

else

{

return "login failure - " + Result.Message;

}

}

My Navigation HTML file code: