email function shows error

[puneet_pr]

i have 1 application which is developed in ASP.net. my email function working fine 2 day ago. but now it shows an error.http://www.tractebelindia.com/User_List.aspx.pdf.

please give me solution.

---------and User_List.aspx code is --------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Net;
using System.Configuration;
using System.Net.Mail;

public partial class Admin_User_List : System.Web.UI.Page
{
    UserADO ComObj;
    DataSet ds;
    DataView dv;
    protected void Page_PreInit(object sender, EventArgs e)
    {
        if ((string)Session["MyTheme"] == null)
        {
            this.Page.Theme = "Kamlesh";
        }
        else
        {
            this.Page.Theme = Session["MyTheme"].ToString();
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["_SortExp_"] = null;
            ViewState["_Direction_"] = "ASC";
            sb_Fill_UserData();
        }
    }

    private void sb_Fill_UserData()
    {
        try
        {
            ComObj = new UserADO();
            ds = new DataSet();
            string strQry = @"SELECT M_User.UserID, M_User.UserName,M_User.Email, M_User.First_Name, M_User.Last_Name, M_User.User_PWD, M_User.Mobile, M_User.Emp_Code, M_User.DOB, M_User.DOJ,M_User.UserTypeID
                FROM M_User INNER JOIN M_UserType ON M_User.UserTypeID = M_UserType.UserTypeID order by M_User.UserID ";
            ds = ComObj.Get_DataSet(strQry);

            if (ViewState["_SortExp_"] != null)
            {
                dv = new DataView(ds.Tables[0]);
                dv.Sort = (string)ViewState["_SortExp_"] + " " + (string)ViewState["_Direction_"];
            }
            else { dv = ds.Tables[0].DefaultView; }

            gv_EmployList.DataSource = dv;
            gv_EmployList.DataBind();
        }
        catch (Exception ex) { lblErrMsg.Text = "<img src='../images/err.gif' style='vertical-align:top;'/>" + ex.Message + "</font"; }
        finally { ComObj = null; }
    }


    protected void gv_EmployList_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        
    }

    protected void gv_EmployList_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Del")
        {
            int Id = Convert.ToInt32(e.CommandArgument.ToString());
            try
            {
                string strQry = "delete from M_User where UserID=" + Id + " ";

                ComObj = new UserADO();
                int lcReturn = ComObj.ExecuteNonQuery_by_Query(strQry);
                sb_Fill_UserData();

            }
            catch (Exception ex) { lblErrMsg.Text = "<img src='../images/err.gif' style='vertical-align:top;'/> " + ex.Message; }
            finally { ComObj = null; }
        }
        if (e.CommandName == "password")
        {
            string[] str = e.CommandArgument.ToString().Split(',');
            string str1, str2;
            str1 = str[0];
            str2 = str[1];
            SendMail(str2,str1);
        }
    }

    protected void gv_EmployList_Sorting(object sender, GridViewSortEventArgs e)
    {
        if (ViewState["_Direction_"].ToString() == "ASC")
        {
            ViewState["_Direction_"] = "DESC";
        }
        else if (ViewState["_Direction_"].ToString() == "DESC")
        {
            ViewState["_Direction_"] = "ASC";
            e.SortDirection = SortDirection.Ascending;
        }

        ViewState["_SortExp_"] = e.SortExpression;
        string cv = ViewState["_Direction_"].ToString();
        sb_Fill_UserData();
    }
    protected void gv_EmployList_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gv_EmployList.PageIndex = e.NewPageIndex;
        sb_Fill_UserData();
    }
    protected void SendMail(string strEmail, string Password)
    {

        MailMessage Msg = new MailMessage();
        // Sender e-mail address.
        Msg.From = new MailAddress("dialhr2011@gmail.com", "HR HelpDesk");
        // Recipient e-mail address.
        Msg.To.Add(strEmail);
        Msg.Subject = "HR Helpdesk: Forget Password";
        Msg.Body = "Your Password is " + Password ;
        // your remote SMTP server IP.
        SmtpClient smtp = new SmtpClient();
        smtp.Host = "smtp.gmail.com";
        smtp.Port = 25;
        smtp.Credentials = new System.Net.NetworkCredential("dialhr2011@gmail.com", "willpower7");
        smtp.EnableSsl = true;
        smtp.Send(Msg);
        lblErrMsg.ForeColor = System.Drawing.Color.Green;
       
        lblErrMsg.Text = "Mail Sent Successfully";
      
        //MailMessage msg = new MailMessage();
        //MailAddressCollection receipents = new MailAddressCollection();
        //string mailreceipent = strEmail;
        //string mailFrom = ConfigurationManager.AppSettings["EmailID"];
        //receipents.Add(mailreceipent);
        //msg.From = new MailAddress(mailFrom);
        //msg.To.Add(receipents.ToString());
        //msg.Subject = "HR Helpdesk: Forget Password";
        //string str = "Your Password is " + Password;

        //try
        //{
        //    SmtpClient client = new SmtpClient("relay-hosting.secureserver.net", 25);
        //    client.UseDefaultCredentials = false;
        //    client.Credentials = new NetworkCredential(ConfigurationManager.AppSettings["EmailID"].ToString(), ConfigurationManager.AppSettings["EmailPassword"].ToString());
        //    client.DeliveryMethod = SmtpDeliveryMethod.Network;
        //    client.Send(msg);
        //}
        //catch { }
    }
}