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Using a Session Object in ASP.NET

I was recently given a new task to download a site created by someone else. But I am absolutely not familiar with the Internet. The website is in ASP.NET, C #. The code itself is not hard to understand except for the Session object. I do not understand where, how and why it was used. Can someone explain the use of a Session object with a possible example?

PS What do these two lines mean?

    lblPensValue.Text = sh.pensDec((string)Session["connSTR"], 113, 23);
and
    if ((string)Session["connSTR"] == null)
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5 answers

Sessionused to store data for a user session on a website. (this data store is a user browser session and can be erased at any time by various application events).

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(string)Session["connSTR"] // Return value from session and casting to string

Session, ASP.NET

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ASP.NET session state allows you to save and retrieve values ​​for a user when a user moves ASP.NET pages in a web application.

ASP.NET Session Status Overview

ASP.NET Session State Examples

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