Re: Sending an e-mail - C# Discussion Boards

5-Mar-06 6:05

Hello,

I am trying to create an e-mail application. I have created a simple mail application in win forms. The user will put in the fields and click the send button.

I am not really sure how an e-mail application works. But if send an e-mail to my e-mail account i.e. steve1_rm@hotmail.com. I send the e-mail. However, I never receive the e-mail that I send using this mail application. The application works ok, and there are no run-time errors. Is there something I need to do, to be able to send this to my hotmail, yahoo, or gmail e-mail accounts.

The code I have used is below. This has been written in C# Visual Studio 2005.

Thanks in advance

<br />
using System.Web.Mail;<br />
<br />
private void btnSend_Click(object sender, EventArgs e)<br />
        {<br />
            try<br />
            {<br />
                //Construct a new mail message and fill it with information from the form<br />
                MailMessage aMessage = new MailMessage();<br />
                aMessage.From = txtFrom.Text;<br />
                aMessage.To = txtTo.Text;<br />
                aMessage.Cc = txtCC.Text;<br />
                aMessage.Bcc = txtBCC.Text;<br />
                aMessage.Subject = txtSubject.Text;<br />
                aMessage.Body = txtMessage.Text;<br />
<br />
                //If an attachment file is indicated, create it and add it to the message<br />
                if (txtAttachment.Text.Length > 0)<br />
                {<br />
                    aMessage.Attachments.Add(new MailAttachment(txtAttachment.Text, MailEncoding.Base64));<br />
                }<br />
<br />
                //Now send the message<br />
                SmtpMail.Send(aMessage);<br />
<br />
                //Indicate that the message has been sent<br />
                MessageBox.Show("Message sent to " + txtTo.Text, "E-mail Program", MessageBoxButtons.OK, MessageBoxIcon.Information);<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message.ToString());<br />
            }<br />

Guffa5-Mar-06 8:42

Guffa

5-Mar-06 8:42

You need an SMTP server. If you don't have one installed on the computer you are running, specify the address of the SMTP server to use in the SmtpServer property in the SmtpMail class.

---
b { font-weight: normal; }

Sean895-Mar-06 12:47

Sean89

5-Mar-06 12:47

I recently got bored and made an e-mail aplication. Using my ISP's mail server worked for me. Also I noticed that you are using System.Web.Mail namespace. In C# 2.0 this is obsolete. System.Net.Mail is the one that the compiler reccommends, however it is not required.

Ex.

using System.Net.Mail;
using System.Net;

...

try
{
     // MailMessage is used to represent the e-mail being sent
     using (MailMessage message = new MailMessage("me@hotmail.com", "you@gmail.com", "Test", "This is a test"))
     {
          message.IsBodyHtml = true;

          // SmtpClient is used to send the e-mail
          SmtpClient mailClient = new SmtpClient("smtp.execulink.com");

          // UseDefaultCredentials tells the mail client to use the 
          // Windows credentials of the account (i.e. user account) 
          // being used to run the application
          mailClient.UseDefaultCredentials = true;

          // Send delivers the message to the mail server
          mailClient.Send(message);
      }

                MessageBox.Show("Message Sent");
}

steve_rm5-Mar-06 20:49

5-Mar-06 20:49

Hello

I have just found some useful information. I have configured the IIS smtp virtual server.

In the general settings l have add my IP address.

In the access tab, click rely button and granted access to my IP address.

I have added this code:
Code:

<br />
Smtp.MailServer = "localhost"; <br />
or<br />
Smtp.MailServer = "127.0.0.1";<br />

But l am still getting the same error message "Transport failed to connect to server".

I have added this code:

<br />
Smtp.MailServer.Insert(0,"localhost");<br />

This time I don't get the error message, but did not receive any e-mail to my yahoo account.

I am using winforms not asp, not sure if this makes any difference.

Any ideas on how to solve this.

Many thanks,

Steve

albCode5-Mar-06 21:12

albCode

5-Mar-06 21:12

Smtp.MailServer = "mail.hotmail.com";
Smtp.MailServer = "mail.gmail.com";

Sebastian Schneider5-Mar-06 23:41

Sebastian Schneider

5-Mar-06 23:41

Be advised that most "Freemail"-Providers do not accept messages which have conflicting Sender-Address and Sender-IP/Hostname information.

That is, they would drop a message from test@hotmail.com if the server sending the message does not belong to hotmail (e.g. sender-address is "test@hotmail.com", sending server is "mail.gmail.com").

Be sure to use the SMTP-Server your Mail-Provider has given your for that address.

--
Contra vim mortem non est medicamen in hortem.

steve_rm6-Mar-06 0:48

6-Mar-06 0:48

Hello,

I made the changes to the SmtpMail.SmtpServer = "mail.hotmail.com";. My listing for sending the code is illistrated below. But still does not work. I am sending the e-mail to my hotmail account steve1_rm@hotmail.com, but never gets there.

<br />
MailMessage aMessage = new MailMessage();<br />
                aMessage.From = txtFrom.Text;<br />
                aMessage.To = txtTo.Text;<br />
                aMessage.Cc = txtCC.Text;<br />
                aMessage.Bcc = txtBCC.Text;<br />
                aMessage.Subject = txtSubject.Text;<br />
                aMessage.Body = txtMessage.Text;<br />
<br />
                //If an attachment file is indicated, create it and add it to the message<br />
                if (txtAttachment.Text.Length > 0)<br />
                {<br />
                    aMessage.Attachments.Add(new MailAttachment(txtAttachment.Text, MailEncoding.Base64));<br />
                }<br />
            <br />
                SmtpMail.SmtpServer = "mail.hotmail.com";<br />
<br />
                //Now send the message<br />
                SmtpMail.Send(aMessage);<br />
<br />
                //Indicate that the message has been sent<br />
                MessageBox.Show("Message sent to " + txtTo.Text, "E-mail Program", MessageBoxButtons.OK, MessageBoxIcon.Information);<br />

Is there something I am doing wrong, or something I am not doing.

Thanks in advance,

Steve

albCode6-Mar-06 3:06

albCode

6-Mar-06 3:06

check this

http://www.c-sharpcorner.com/1/send_mai1l.asp

http://deedee.brainstream.net/SimpleSmtpMailCExampleASPNET.aspx

steve_rm6-Mar-06 16:08

6-Mar-06 16:08

Hello

I have found some information on another post that told me that you cannot directly send e-mails from the outside to hotmail, yahoo, etc. In order for you to do this you have to send a username and password to be authenticated for hotmail, yahoo, etc. I thought it was possible to send e-mails to these accounts.

I did what you suggested and my code is similar to yours. I deleted the mails from inetpub/mailroot/queue and restarted IIS. But still did not work.

Any other suggestions about this I would be most grateful.

Thanks,

Steve

USB Port

Sean895-Mar-06 4:58

Sean89

5-Mar-06 4:58

I am interested in playing around with some IO in C#. Could someone point me out to some articles about IO with a USB port in C# 2.0?

Thanks,
Sean

Re: USB Port

Ed.Poore5-Mar-06 6:56

Ed.Poore

5-Mar-06 6:56

The only thing I've come across is IC#Code's #usblib

But I don't think it's been updated in a long time.

Another alternative is to use the SerialPort class and specify a usb port to open (this works in the old MSComm control). I'll try and remember how the ports are named Smile | :)

, this will allow you to use the USB port like a Serial Port

Ed

Re: USB Port

Sean895-Mar-06 9:13

Sean89

5-Mar-06 9:13

Thanks

Re: USB Port

eggie55-Mar-06 20:24

eggie5

5-Mar-06 20:24

QuickUSB is what I used. But, it's driver interface was only exposed/documented/exampled in C++. SO, I made a handy C# wrapper class. But of course, this only works with quickusb usb 2.0 chips...

/\ |_ E X E GG

Form - Handle

AJ1235-Mar-06 4:44

AJ123

5-Mar-06 4:44

Anyone know of anything that causes a window form to lose its handle and regenerate it? Got a form whose handle changes after form load and wondering if there is any common cause?

Thanks
Aj

Stanciu Vlad5-Mar-06 6:23

Stanciu Vlad

5-Mar-06 6:23

If I am not mistaking a form's handle does not changes. It represents a global unique id of a window, allocated at the creatin of the window. But if you use a static field and compare it withe various instance hadles you will have variations. (ie. create a form, dispose it, and recreate it).
But this is theoretically, meaning that Microsoft may do whatever wishes with all the resources.

-- modified at 14:21 Sunday 5th March, 2006

It proves that actualy a handle may change in the lifetime of a form. Quoting MSDN[^]:

IWin32Window.Handle Property
Remarks
Depending on the implementer, the value of the Handle property could change during the life of the window.

-- modified at 15:01 Sunday 5th March, 2006

It proves that I was kind of right... Here are some other usefull infos about the way a handle can change : MSDN Link[^]

protected internal static readonly ... and I wish the list could continue ...

AJ1235-Mar-06 9:09

AJ123

5-Mar-06 9:09

Thanks for the reply. That was my understanding of a forms' handle too - a new handle per form instance and it's fixed. But for some strange reason this form gets two during form load (during and after).

If i subcribe to the Handle created and destroyed event its illustrated. I do have some old ActiveX interop controls on the form perhaps they are responsible, also the form becomes an MDI child. However i was just wondering whether there was some kind of common reason why this would occur. I am pretty certain the MDI aspect isn't the issue.

I'll have a read of the MSN resource - will let you know if i get to the bottom of it.

Thanks again
Aj

Stanciu Vlad5-Mar-06 9:27

Stanciu Vlad

5-Mar-06 9:27

Could you please email me your project (or the part of your project integrated into a smaller one) that changed the hwnd of the form here : vlastanciu@yahoo.com?
You have startled me Smile | :)

protected internal static readonly ... and I wish the list could continue ...

Gavin Taylor5-Mar-06 18:49

Gavin Taylor

5-Mar-06 18:49

Windows allocates a static handle whenever you create a window, that is valid for the lifetime of the window.

At what point are you setting the form as an MDI client? When you set the MdiParent property .NET has to recreate the form from scratch as it changes it's underlying class type - hence the new handle - the OS treats MDI clients differently to normal Windows and has to process extra messages etc.

In short, if your using a form as an MDI client do it before anything else as it will only cause you grief if your depending on the handle being constant.

Gavin Taylor
w: http://www.gavspace.com