Send mail med .NET

Hej,

Jeg har et webhotel hos web10.dk, og jeg forsøger at sende en mail. Det skal foregå sådan, at man trykker på en knap hvorpå der står 'Send mail', og så skal C#-delen, som i øvrigt er back-end, altså i en .cs-fil for sig, sørge for.

Dette er koden til at sende mailen:

 public void OnSendMailClick(object sender, EventArgs e)
 {
     System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.m99.dk", 25);
     smtp.Send(
         "afsenders mail",
         "modtagers mail",
         "Hej min ven",
         "<b>Hej</b> <i><font color=red>Thomas</font></i><p>Dette er en test...</p>"
     );
 }

Når jeg trykker på Send mail-knappen (som er en <asputton> og ja, den har en OnClick="OnSendMailClick"), så får jeg den klassiske asp.net-fejlside at se. Meddelelsen denne gang er:


Unable to read data from the transport connection: net_io_connectionclosed.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

<%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
<system.web>
<compilation debug="true"/>
</system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.