How to access public member variable in the parent page class from a Web User Control

The title pretty much says my problem.

I have a .aspx main page

- index.aspx.cs

public partial class IndexPageClass : System.Web.UI.Page
{
public string m_strCustomerName = "abc";
.
.
.
}

- In index.aspx, I need to display it in a list.

<%@ Register Src="signin.ascx" TagName="si ...