class question

I am getting an HTTP Error 403 - Forbidden. When trying to envoke a method from a class file. Help please.

Here is the callback from mypage.aspx:
protected void btnLogin_Click (object sender, EventArgs e)
{
string strLoginResponse = Login.Process(uName.Text, pWord.Text);if (strLoginResponse == "Hello There!")
{
strlblUname.Text = (Go to the complete details ...