邮件发送(第一次点击按钮不响应)

[paulyjin]

这是全部代码:
问题是:我运行点击按钮后,第一次发送提示成功发送,但是邮箱中无信息,你在点击第二次,第三次,邮箱中都有信息,这下晕了,高手们,希望 > > > >??????


DataSet ds = new DataSet();
public int resultCount = 0;
protected void Page_Load(object sender, EventArgs e)
{
OleDbConnection cn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["con"].ConnectionString);
OleDbCommand cmd = new OleDbCommand("select count(*) from email", cn);
cn.Open();
resultCount = Convert.ToInt32(cmd.ExecuteScalar());
cn.Close();

OleDbDataAdapter dr = new OleDbDataAdapter("select email from email", cn);
cn.Open();
dr.Fill(ds);
cn.Close();
}
//群发邮件
private void SendMyMail()
{
string FromMail = "[e-mail]"; //发件人
string Title = txtName.Text; // 邮件主题
string Body = txtMessage.Text; //邮件主体

string MailUserName = "liyou502"; //FromMail.Substring(0, FromMail.IndexOf( '@ '));
string MailPassword = "****"; //发件人邮箱密码

MailMessage mailmessage = new MailMessage();
MailAddress n = new MailAddress(FromMail);

mailmessage.From = n;
mailmessage.Subject = Title;
mailmessage.Body = Body;

System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
client.Host = "smtp.163.com";
client.Credentials = new System.Net.NetworkCredential(MailUserName, MailPassword);
try
{
string[] Receiver = new string[resultCount];//resultCount为数据库中的行数(无空值)
for (int i = 0; i < resultCount; i++)
{
Receiver[i] = ds.Tables[0].Rows[i]["email"].ToString();
}
for (int i = 0; i < resultCount; i++)
{
if (Receiver[i] == "")
{
Receiver[i] = "[e-mail]";
}
MailAddress to = new MailAddress(Receiver[i].ToString());
mailmessage.To.Add(to);
client.Send(mailmessage);
mailmessage.To.Clear();
Response.Write("成功发送!");
}
}
catch (Exception)
{
Response.Write(" <script language= 'javascript ' >alert( '邮件发送失败! ') </script >");
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
SendMyMail();
//Response.Write(" <script >alert ( 'Email envoyé avec succès ! ');location.href= 'index.aspx '; </script >");

}
}

[paulyjin]

好郁闷!!