Unable to send Mails through SMTP using Asp.Net -


i need send mails 60 100 students @ time when click on send button. working if have 6 7 students when start sending 60 students code shows following error

insufficient system storage. server response was: many emails per connection.

here code

protected void btnsend_click(object sender, eventargs e) {

     if (drptopics.selectedvalue == "-1")             {                 response.write(@"<script language='javascript'>alert('please select 1 topic');</script>");             }        else       {      sqlconnection conn = new sqlconnection();     conn.connectionstring = "data source=xxxx; user id=sa; password=xxxx; initial catalog=xxxx; integrated security=sspi;";     conn.open();       sqlcommand cmd = new sqlcommand();     cmd.connection = conn;     cmd.commandtext = "select email_1 student_info branch_code='ap' , student_id in(select student_id admissions branch_code='ap' , batch_id='" + txtbatchid.text + "')";     cmd.commandtype = commandtype.text;      sqldataadapter da = new sqldataadapter(cmd);     da.selectcommand = cmd;     dataset ds = new dataset();     da.fill(ds);         if (ds.tables[0].rows[0][0] != null)     {         int count = ds.tables[0].rows.count;           (int = 0; < count; i++)         {              mailmessage mm = new mailmessage();             mm.to.add(new mailaddress(ds.tables[0].rows[i][0].tostring()));             mm.from = new mailaddress("xxxxx@abc.com");             mm.subject = "sms , interview questions of oracle 11g dba";             mm.isbodyhtml = true;                  //day 1 architecture 1              if (drptopics.selectedvalue == "1")             {                 attachment attachment1 = new attachment(server.mappath("~/oracle 11g dba/day 1/architecture-1-i.doc")); //create attachment                 mm.attachments.add(attachment1);                 attachment attachment2 = new attachment(server.mappath("~/oracle 11g dba/day 1/architecture1-s.doc")); //create attachment                 mm.attachments.add(attachment2);              }               //day 2 architecture 2             else if (drptopics.selectedvalue == "2")             {                 attachment attachment1 = new attachment(server.mappath("~/oracle 11g dba/day 2/architecture-2-i.doc")); //create attachment                 mm.attachments.add(attachment1);                 attachment attachment2 = new attachment(server.mappath("~/oracle 11g dba/day 2/architecture2-s.doc")); //create attachment                 mm.attachments.add(attachment2);             }               mm.body = "<html><head><body><h1>thank choosing wilshire</h1><br><b>team wilshire<b></body></head></html>";             smtpclient s = new smtpclient("smtp.net4india.com");             s.send(mm);           }      }

}

please tell me solution........................

smtpclient.sendasync() lead other problems (smtp servers set maximum mail number per minute avoid spam)!

since mails identical, solution 1 single mail recipients hidden recipients (bcc)!

mailmessage mm = new mailmessage();  (int = 0; < count; i++) {   mm.bcc.add(new mailaddress(ds.tables[0].rows[i][0].tostring())); } mm.to.add(new mailaddress("xxxxx@abc.com"); mm.from = new mailaddress("xxxxx@abc.com"); mm.subject = "sms , interview questions of oracle 11g dba";  ....  smtpclient s = new smtpclient("smtp.net4india.com"); s.send(mm);

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