help sorting this code which gives wrong results

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Lexi85

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200 Points

692 Posts

help sorting this code which gives wrong results

Feb 01, 2017 10:49 AM|Lexi85|LINK

Hello All

I have below code which send email to list of users in the table with their own <Username>the table has 2 records

Empid1 Usename Phone email

1 abc 8247 user1@email.com

2 def 9876 user2@email.com

The code below sends mail, but it send the same email to both email addresses in the table..it says

Dear def to both emails...and send email with To: user1@email.com and cc as user2@email.com

can someone please help me sort out this code so that each user gets a different email with different details

  Protected Sub Button1_Click(sender As Object, e As EventArgs)
      
        Dim username As String = "user@email.com"
        Dim password As String = "Password"
        Dim subject = "Confirm Contact"
        Dim smtpclient As SmtpClient = New SmtpClient()
        Dim mail As MailMessage = New MailMessage()
        Dim fromaddress As MailAddress = New MailAddress("user@email.com")
        smtpclient.Host = "smtp.gmail.com"
        smtpclient.Port = 587
        mail.From = fromaddress
        Dim dt As New DataTable("UserTable")
        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As New SqlConnection(constr)
            Using cmd As New SqlCommand("SELECT empid,UserFirstName,UserLastName,Usertelephone,Useremail from employee ", con)
                Using sda As New SqlDataAdapter()
                    cmd.Connection = con
                    sda.SelectCommand = cmd
                    sda.Fill(dt)
                End Using
            End Using
        End Using

        For Each row As DataRow In dt.Rows


            Dim messageBody = File.ReadAllText(Server.MapPath("~/email1.html"))
            messageBody = messageBody.Replace("<%UserFirstName%>", Convert.ToString(row("UserFirstName"))).Replace("<%UserPhonenumber%>", Convert.ToString(row("Usertelephone")))

          

            With mail
                mail.To.Add(Convert.ToString(row("Useremail")))
              
                mail.Subject = subject
                mail.Body = messageBody
            End With
           
            mail.IsBodyHtml = True
            smtpclient.EnableSsl = True
            smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network
            smtpclient.Credentials = New System.Net.NetworkCredential(username, password)
        Next
        smtpclient.Send(mail)


    End Sub
End Class

email1.html

<html>
<head>
    <title></title>
	<meta charset="utf-8" />
</head>
<body>
Dear <%UserFirstName%>
 These are the details we have found
    
    <%UserFirstName%><%UserPhonenumber%>


Please click here to confirm or correct our records <br /><a href="http://localhost/userconfirmation.aspx?empid=" & empid >Click Here</a>

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mgebhard

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30711 Points

11175 Posts

Re: help sorting this code which gives wrong results

Feb 01, 2017 11:05 AM|mgebhard|LINK

Have you tried stepping through the code using the Visual Studio debugger? The logical error are very obvious and should pop out while your debugging.

https://msdn.microsoft.com/en-us/library/y740d9d3.aspx

Each loop iterations adds an email address to the TO address.
The last email template is the one sent since smtpclient.Send(mail) is outside the loop.

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Lexi85

Member

200 Points

692 Posts

Re: help sorting this code which gives wrong results

Feb 01, 2017 11:17 AM|Lexi85|LINK

I did include it in the loop...it sends 2 emails to 1st email address(which is not right as it should get just 1 email) and and 2nd email to 2nd email address(which is correct)

I am sure this is to do with loop but i dont understand whats wrong

 For Each row As DataRow In dt.Rows
            Dim username As String = "user@email.com"
            Dim password As String = "Password"
            Dim subject = "Confirm Contact"
            Dim smtpclient As SmtpClient = New SmtpClient()
            Dim mail As MailMessage = New MailMessage()
            Dim fromaddress As MailAddress = New MailAddress("user@email.com")
            smtpclient.Host = "smtp.gmail.com"
            smtpclient.Port = 587
            mail.From = fromaddress

            Dim messageBody = File.ReadAllText(Server.MapPath("~/email1.html"))
            messageBody = messageBody.Replace("<%UserFirstName%>", Convert.ToString(row("UserFirstName"))).Replace("<%UserPhonenumber%>", Convert.ToString(row("Usertelephone")))



            With mail
                mail.To.Add(Convert.ToString(row("Useremail")))

                mail.Subject = subject
                mail.Body = messageBody
            End With

            mail.IsBodyHtml = True
            smtpclient.EnableSsl = True
            smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network
            smtpclient.Credentials = New System.Net.NetworkCredential(username, password)

            smtpclient.Send(mail)
        Next

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mgebhard

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30711 Points

11175 Posts

Re: help sorting this code which gives wrong results

Feb 01, 2017 11:29 AM|mgebhard|LINK

Lexi85
I did include it in the loop...it sends 2 emails to 1st email address(which is not right as it should get just 1 email) and and 2nd email to 2nd email address(which is correct)

The statement above and stepping through the code with the Visual Studio debugger should clearly indicate the logical bug. Not to mention I explained the bug in my previous post. Being there is only 10 minutes between my post and your next post, I'm under the impression you are not taking the time to debug and just want the answer given to you.

The problem is you are adding to the TO address collection on each and every loop.

With mail
	mail.To.Add(Convert.ToString(row("Useremail")))
  
	mail.Subject = subject
	mail.Body = messageBody
End With

Try clearing the TO address after sending the email.

mail.To.Clear()

Or take a moment to review your code and rethink the design.

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