I cannot fix this compiling error...

public partial class pgEmail : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSend_Click(object sender, EventArgs e)
    {
        try
        {
            //create object clsBusinessLayer class and call sendMail method
            clsBusinessLayer sendObj = new clsBusinessLayer();
            sendObj.SendEmail(txtFrom.Text, txtTo.Text, txtSubject.Text, txtMessage.Text);

            //set the successful mail sent message to the status label
            lblStatus.Text = "The message was sent to: " + txtTo.Text;

        }
        catch (Exception ex)
        {
            // set the not successful mail sent message to the status label
            lblStatus.Text = "An error has occurred while trying to send this message, " + ex.Message;
        }
    }
}