Show Logged In User Name in redirect.aspx Page - asp.net

Question

I'm a complete stranger to ASP.NET. But, I've had a project to do using it & faced a problem.
It is :
I have a login.aspx File - Where Users provide login User name & Password
If Login details (match Data Base) OK then User automatically redirects to logged_in.aspx.
There's a label (lbl_show) in redirected logged_in.aspx.
I need to show Logged in Username in it.
I read bunch of articles & came with nothing because of my lack of understanding so please help me.

Answer 1

se session variables in order to pass any value from one page to another.
Assign the Username value to the session variable and use it in your logged_in page as follows:
// In login page
Session["UserName"] = txtUserName.text;
//In logged_in page
label1.text = Session["UserName"];
Also refer the following link for State Management:
http://www.codeproject.com/Articles/492397/State-Management-in-ASP-NET-Introduction

Answer 2

You need to set an Authentication Cookie. It's easy and will allow you to leverage ASP.NET functionality easily (many built-in controls and also user-access control). I detail how in this SO post:
Using cookies to auto-login a user in asp.net (custom login)

Answer 3

The problem with the code
// In login page
Session["UserName"] = txtUserName.text;
//In logged_in page
label1.text = Session["UserName"];
Is casting is missing it should be
label1.text = Session["UserName"].ToString();
Edit 1
As Session contains object and if you have something other than object then you will have to explicitly cast it in your require type.
Suppose you have array in you Session then you will have to cast it back to array.
String[] Names={"abc","def","ghi"};
Session["NamesCol"]=Names;
Then if you want to use it you will have to cast it as follow
String[] NewNames=(string[])Session["NamesCol"];