Pass value from Page to User Control

 Hi all,
I have a textbox on my aspx page and I need a user control to be able to see or access that value, how would I do that please.
I created a public property on my aspx page
public string txtBoolValue
    {
        get { return this.txtBool.Text;}
    }


How do I call that  from my ascx page?
Thanks
Melt

...