accessing class variables

[pug]

hello again,

sorry about another post but im new to OOP and i am having trouble understanding how i can access a variable from one class from a different class.

I have a class

public class Main : System.Web.UI.Page
{
       public string loadFile = " ";
       .    
       .
public void Page_Load(object sender, System.EventArgs e)
{
       loadFile = "test";
}

then in my messsage class i have

public class Message : System.Web.UI.Page
{
Private void Page_Load(object sender, System.EventArgs e)
{	
	Main mc = new Main();
       StreamReader sr = new StreamReader(mc.loadFile);	
        .
        .
}

i have access to the variable "loadFile" but it doesnt seem to grab the text out of the string. OOP is starting to frustrate me >.<

Thanks again guys