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System.Net.Mail vs System.Web.Mail

I want to use the new System.Net.Mail instead of the old System.Web.Mail .

I'm getting an error "Hot not specified" when I try to do my last two lines:

System.Net.Mail .SmtpClient SMTP = new SmtpClient();
SMTP.Send(Messa ge); //Error happens here
But the thing is, in my old use of System.Web.Mail , I never had this
problem. Why do I HAVE to specify the host in the new version and I didn't
have to in the old?

Jun 16 '06 #1
2 2163

In oldversion when using System.web.Mail , the SmtpMail class automatically
uses the built-in mail service in Windows 2000. But in new version,
SmtpClient class does not use any default mail service. Hence when using
System.Net.Mail namespace, you need to specify the host.

SmtpClient mailObj = new SmtpClient();
mailObj.Host = "name of the host";


SmtpClient mailObj = new SmtpClient( "name of the host");
MailMessage mail = new MailMessage("x@ yahoo.co.in", "x@hotmail.com" ,
"Testing", "Hello Everybody");
mailObj.Send(ma il);


"Alex Maghen" <Al********@new sgroup.nospam> wrote in message
news:93******** *************** ***********@mic rosoft.com...
I want to use the new System.Net.Mail instead of the old System.Web.Mail .

I'm getting an error "Hot not specified" when I try to do my last two

System.Net.Mail .SmtpClient SMTP = new SmtpClient();
SMTP.Send(Messa ge); //Error happens here
But the thing is, in my old use of System.Web.Mail , I never had this
problem. Why do I HAVE to specify the host in the new version and I didn't
have to in the old?


Jun 16 '06 #2

Thank you Sharmila for your input.

Hi Alex,

Thank you for your post.

Unlike System.Web.Mail , which was introduced in the 1.0 Framework,
System.Net.Mail is not built upon the CDO/CDOSYS libraries. Instead it is
written from the ground up without any interop. Thus, it is not dependant
upon on other COM libraries. Although some functionality has been removed,
the new System.Net.Mail namespace is much more versatile than the older CDO
dependant System.Web.Mail .

Other than Sharmila's input about specifying the server in code, you can
also config the Host, Credentials and Port properties for SmtpClient by
using the settings in the application or machine configuration files. For

<configuratio n>
<mailSettings >
<smtp deliveryMethod= "network">
host="localhost "
defaultCredenti als="true"

Hope this helps. Please feel free to post here if anything is unclear.

Walter Wang
Microsoft Online Community Support

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Jun 16 '06 #3

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