Asp.net sends email

Email. aspx:

Email. aspx. CS:

Using system;
Using system. collections;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. Web;
Using system. Web. sessionstate;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. htmlcontrols;
Using system. Web. mail;
Using system. IO;

Namespace Test
{
///

/// Email abstract description.
///

Public class email: system. Web. UI. Page
{
Protected system. Web. UI. webcontrols. Button button1;
Protected system. Web. UI. webcontrols. textbox tbsubject;
Protected system. Web. UI. webcontrols. textbox tbbody;
Protected system. Web. UI. htmlcontrols. htmlinputfile upfile;
Protected system. Web. UI. webcontrols. dropdownlist dropdownlist1;
Protected system. Web. UI. webcontrols. Button button2;
Protected system. Web. UI. webcontrols. Button button3;
Protected system. Web. UI. webcontrols. textbox TBTO;

Private void page_load (Object sender, system. eventargs E)
{
If (! This. ispostback)
{
}
}

# Generated by region web Form DesignerCode
Override protected void oninit (eventargs E)
{
//
// Codegen: This call is required by the ASP. NET web form designer.
//
Initializecomponent ();
Base. oninit (E );
}

///

/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
///

Private void initializecomponent ()
{
This. button1.click + = new system. eventhandler (this. button#click );
This. button2.click + = new system. eventhandler (this. button2_click );
This. button3.click + = new system. eventhandler (this. button3_click );
This. Load + = new system. eventhandler (this. page_load );

}
# Endregion

Private void button#click (Object sender, system. eventargs E)
{
Mailmessage mymail = new mailmessage ();
Mymail. Subject = This. tbsubject. Text. Trim ();
Mymail. From = "smallfools@sina.com ";
Mymail. To = This. TBTO. Text. Trim ();
Mymail. Body = This. tbbody. text;
Mymail. Fields. Add ("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", 1 );
Mymail. Fields. Add ("http://schemas.microsoft.com/cdo/configuration/sendusername", "smallfools ");
Mymail. Fields. Add ("http://schemas.microsoft.com/cdo/configuration/sendpassword ","****");

If (this. dropdownlist1.items. Count> 0)
{
For (INT I = 0; I <this. dropdownlist1.items. Count; I ++)
{
Mailattachment myattachment = new system. Web. Mail. mailattachment (server. mappath (this. dropdownlist1.items [I]. Value ));
Mymail. attachments. Add (myattachment );
}

}

Smtpmail. smtpserver = "smtp.sina.com.cn ";
Smtpmail. Send (mymail );

If (this. dropdownlist1.items. Count> 0)
{
For (INT I = 0; I <this. dropdownlist1.items. Count; I ++)
{
Fileinfo myfile = new fileinfo (server. mappath (this. dropdownlist1.items [I]. Value ));
Myfile. Delete ();
}
}

Page. registerclientscriptblock ("OK ","");
}

Private void button2_click (Object sender, system. eventargs E)
{
If (this. upfile. postedfile. contentlength! = 0)
{
String clientfilename = This. upfile. postedfile. filename;
String [] strtemp = clientfilename. Split ('.');
String upfileexp = strtemp [strtemp. Length-1]. tostring ();
String serverfilename = datetime. Now. tostring ("yyyymmddhhmmss") + "." + upfileexp;
This. upfile. postedfile. saveas (server. mappath (serverfilename ));
This. dropdownlist1.items. Add (New listitem (clientfilename, serverfilename ));

If (this. dropdownlist1.items. Count> 0)
{
This. button3.enabled = true;
}
Else
{
This. button3.enabled = false;
}
}
}

Private void button3_click (Object sender, system. eventargs E)
{
Fileinfo myfile = new fileinfo (server. mappath (this. dropdownlist1.selectedvalue ));
Myfile. Delete ();

This. dropdownlist1.items. Remove (this. dropdownlist1.items [This. dropdownlist1.selectedindex]);

If (this. dropdownlist1.items. Count> 0)
{
This. button3.enabled = true;
}
Else
{
This. button3.enabled = false;
}
}
}
}