/// <summary>
/// Validates the email.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Web.UI.WebControls.ServerValidateEventArgs"/> instance containing the event data.</param>
/// <param name="page">The calling <see cref="System.Web.UI.Page" /> web page.</param>
public void ValidateEmail(object sender, ServerValidateEventArgs e, Page page)
{
    var emailAddress = page.FindControl("emailAddress") as TextBox;
    var firstName = page.FindControl("firstName") as TextBox;