How to declare session variable in C#?

newSession is a poor name for a Session variable. However, you just have to use the indexer as you’ve already done. If you want to improve readability you could use a property instead which can even be static. Then you can access it on the first page from the second page without an instance of it.

page 1 (or wherever you like):

public static string TestSessionValue 
{ 
    get 
    {
        object value = HttpContext.Current.Session["TestSessionValue"];
        return value == null ? "" : (string)value;
    }
    set 
    {
        HttpContext.Current.Session["TestSessionValue"] = value;
    }
}

Now you can get/set it from everywhere, for example on the first page in the TextChanged-handler:

protected void TextBox1_TextChanged(Object sender, EventArgs e)
{
    TestSessionValue = ((TextBox)sender).Text;
}

and read it on the second page:

protected void Page_Load(Object sender, EventArgs e)
{
    this.Label1.Text = Page1.TestSessionValue; // assuming first page is Page1
}

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