The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

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ASP.NET

email

SMTP

Gmail

hii all

i am getting an error in sending mail module in my asp .net web application.

my mail module is working properly in local host.. when i publish my application

my btnsnd_click code is

string usertype = string.Empty;
DataTable dt = new DataTable();
try
{
    for (int i = 0; i < grEmp.Rows.Count;i++ )
    {
        CheckBox cb = (CheckBox)grEmp.Rows[i].FindControl("chkSelect");


        if (cb.Checked == true)
        {
            if (cb != null && cb.Checked)
            {
               
                string emailid = grEmp.Rows[i].Cells[1].Text;
           
                SendEmailUsingGmail(emailid);
            
                dt.Clear();
                dt.Dispose();
            }
            ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), Guid.NewGuid().ToString(), "alert('Emails sent successfully');", true);
        }
    }
    ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), Guid.NewGuid().ToString(), "alert('Please check CheckBox');", true);
}
catch (Exception ex)
{
    Response.Write("Error occured: " + ex.Message.ToString());
}
finally
{
    usertype = string.Empty;
 }
}

private void SendEmailUsingGmail(string toEmailAddress)
{
    try
    {
        SmtpClient smtp = new SmtpClient();
        smtp.Credentials = new NetworkCredential("anilkumar.hrs@gmail.com", "anil");
        smtp.Port = 587;
        smtp.Host = "smtp.gmail.com";
        smtp.EnableSsl = true;
        MailMessage message = new MailMessage();
        message.From = new MailAddress("anilkumar.hrs@gmail.com");
        message.To.Add(toEmailAddress);
        message.Subject = TxtSubject.Text;
        message.Body = TxtMessage.Text;
        smtp.Send(message);
    }
    catch (Exception ex)
    {
        Response.Write("Error occured: " + ex.Message.ToString());
    }
}

the error is

Error occured: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at