Global variables in c#.net

Question

How can I set a global variable in a C# web application?

What I want to do is to set a variable on a page (master page maybe) and access this variable from any page.

Answer 1

Just declare the variable at the starting of a class.

e.g. for string variable:

public partial class Login : System.Web.UI.Page
{
    public string sError;

    protected void Page_Load(object sender, EventArgs e)
    {
         //Page Load Code
    }