Mail Application generating error

Hi, I am pasting the code.. **************************************************************************' using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.Web.Mail; namespace EmailApplication { ///

/// Summary description for _Default. ///

public class _Default : System.Web.UI.Page { protected System.Web.UI.WebControls.Button Button2; protected System.Web.UI.WebControls.ListBox FileList; protected System.Web.UI.WebControls.Button Button3; protected System.Web.UI.WebControls.TextBox txtTo; protected System.Web.UI.WebControls.TextBox txtFrom; protected System.Web.UI.WebControls.TextBox txtSubject; protected System.Web.UI.WebControls.TextBox txtBody; protected System.Web.UI.HtmlControls.HtmlInputFile File1; protected System.Web.UI.WebControls.Button Button1; private void Page_Load(object sender, System.EventArgs e) { if(!Page.IsPostBack) { } } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } ///

/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///

private void InitializeComponent() { this.Button2.Click += new System.EventHandler(this.Button2_Click); this.Button1.Click += new System.EventHandler(this.Button1_Click); this.Button3.Click += new System.EventHandler(this.Button3_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion // button used to send the email private void Button1_Click(object sender, System.EventArgs e) { MailMessage mail = new MailMessage(); mail.To = txtTo.Text; mail.From = txtFrom.Text; mail.Subject = txtSubject.Text; mail.Body = txtBody.Text; MailAttachment attachment = null; try { // check to see if there are any attachments or not if(FileList.Items.Count > 0) { foreach(ListItem l in FileList.Items) { // Attaches a new attachment contained in the List Response.Write(l.Text); attachment = new MailAttachment(l.Text); mail.Attachments.Add(attachment); } } //mail.Attachments.Add(attachment); Response.Write("Number of attachments are"+mail.Attachments.Count); SmtpMail.SmtpServer = "127.0.0.1"; SmtpMail.Send(mail); } catch(Exception ex) { Response.Write(ex.Message); // Cacthes the exception here } } // Button used to attach a file private void Button2_Click(object sender, System.EventArgs e) { // gets the file name with the whole path string attachedFile = File1.PostedFile.FileName; // Adds the item in the list of attached files if(attachedFile != "") { FileList.Items.Add(attachedFile); } } private void Button3_Click(object sender, System.EventArgs e) { } } } ************************************************************************************* Pls help me in fixing this... thanks for u to help me****************** Regards, Saravanan.M