Pass object from aspx to ascx?

Hi All,
 
How can I set properties in ASCX from an object created in ASPX. Without starting a new initializated object?
 ASPX code:

public partial class MyClass: System.Web.UI.Page
{
    protected string _companyID;
    public string CompanyID
    {
        get
        {
            return _companyID;
        }
        set
        {
            _companyID = value;
        }
    }
.....etc...

ASCX code:

public partial class Controls_MyControl: System.Web.UI.UserControl,
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