'Throws exception when session of class getting null - c#

I have stored logged in user details when user login to the system. And I have reusing it on many pages of my application. But after idle time, when I'm using the application it throws an error like below. How can I solve this?

 public class GlobalVariables
{
    public  string login_user_name = string.Empty;
    public  string login_user_id = string.Empty;
    public  string login_user_role = string.Empty;
}  
 <sessionState mode="InProc" regenerateExpiredSessionId="true" stateNetworkTimeout="30" sqlCommandTimeout="30" cookieless="false" timeout="30"/>

When login, storing the login details to the Session["objGlobalVariableClass"] as below :

  GlobalVariables obj_GlobalVariables = new GlobalVariables();
  obj_GlobalVariables.login_user_id = userID;
  obj_GlobalVariables.login_user_name = user_name;
  obj_GlobalVariables.login_user_role = login_user_role;//getting from database
  Session["objGlobalVariableClass"] = obj_GlobalVariables;

On every other pages:

  GlobalVariables obj_GlobalVariables;
 protected void Page_Load(object sender, EventArgs e)
    {
        obj_GlobalVariables= (GlobalVariables)Session["objGlobalVariableClass"];
        try
        {
            if (obj_erms_GlobalVariables == null)
            {
                string log_data = "GlobalVariable details are getting null  \r\n";
                Response.Redirect("Default.aspx");
            }
        }
        catch (ThreadAbortException)
        {
            // possibly do something here
            Thread.ResetAbort();
        }
     }
if(!IsPostBack)
{ 
lbl_username.Text = "Welcome " + obj_GlobalVariables.login_user_name;
}

But after idle time, system shows error when using this logged in user details. It' becomes null there. How can I redirect to login page if it gets null anywhere in the system?

enter image description here

c++sharpasp.netsession-variables


Solution 1:[1]

On web.config, I added below lines of code.

  <authentication mode="Forms">
      <forms loginUrl="Default.aspx" requireSSL="true" timeout="30"/>
    </authentication>

This will auto logout the page when session time out. And hence that error will not come up.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 user2431727

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