Please help me to figure out what is wrong with this code:

I have ASP.NET page with one button visible.

When user clicks it - it instances MyClass (its implementation is in AppCode directory) and turns invisible (button2 becomes visible).

When I click button2 it raises "Object reference not set to an instance of an object" Exception.

What seems to be the problem?

{

public MyClass noviTest;

protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
    noviTest = new MyClass(TextBox1.Text);
    Button1.Visible = false;
    Button2.Visible = true;

}
protected void Button2_Click(object sender, EventArgs e)
{
    Label1.Text=noviTest.getID; //this is the critical line

}

}

Thank You in advance, Regards