asp.net – System.Net.Mail新MailMessage随机发送重复的电子邮

Try
    Dim Attachment As String
    Attachment = path + myUniqueFileName

    Dim mailMessage As MailMessage = New MailMessage
    mailMessage.From = New MailAddress("Test@Test.com")
    mailMessage.Subject = "Report " + " " + myUniqueFileName
    mailMessage.IsBodyHtml = True
    mailMessage.To.Add(New MailAddress(Session("EmailAddress")))
    mailMessage.Attachments.Add(New Attachment(Attachment))
    mailMessage.Body = "Attached is your report"

    Dim smtp As SmtpClient = New SmtpClient

    smtp.Host = "mail.net"

    Dim NetworkCred As System.Net.NetworkCredential = New System.Net.NetworkCredential

    smtp.Credentials = New NetworkCredential("test","test")
    smtp.UseDefaultCredentials = False
    smtp.Send(mailMessage)

Catch ex As Exception

    Dim message As String = ex.ToString
    Dim sb As New System.Text.StringBuilder()
    sb.Append("<script type = 'text/javascript'>")
    sb.Append("window.onload=function(){")
    sb.Append("alert('")
    sb.Append(message)
    sb.Append("n")
    sb.Append(String.Format("{0:f2}",Convert.ToDouble(TotalAmount)))
    sb.Append("')};")
    sb.Append("</script>")
    ClientScript.RegisterClientScriptBlock(Me.GetType(),"alert",sb.ToString())

End Try

图像按钮代码：

<asp:ImageButton ID="cmdFinish" runat="server" Height="38px" ImageUrl="~/Images/Finish.png" Width="99px" UseSubmitBehavior="false" OnClientClick="this.disabled = true; this.value = 'Sending...';" Text="Send" />