我正在尝试制作一个简单的电子邮件发送程序,但是当它说object reference not set to an instance of an object
Try
Dim mail As MailMessage
Dim client As SmtpClient
Dim SmtpServer As New SmtpClient()
Dim fromAddress As String
Dim toAddress1 As String
Dim toAddress2 As String
Dim toAddress3 As String
Dim subject As String
Dim message As String
SmtpServer.Credentials = New Net.NetworkCredential("*********@gmail.com", "**********")
client.UseDefaultCredentials = False
fromAddress = FromEmail.Text
If ToEmail1.Visible = True Then
toAddress1 = ToEmail1.Text
ElseIf ToEmail1.Visible = True And ToEmail2.Visible = True Then
toAddress1 = ToEmail1.Text
toAddress2 = ToEmail2.Text
ElseIf ToEmail1.Visible = True And ToEmail2.Visible = True And ToEmail3.Visible = True Then
toAddress1 = ToEmail1.Text
toAddress2 = ToEmail2.Text
toAddress3 = ToEmail3.Text
End If
subject = "Subject"
Message = "Message"
mail = New MailMessage(fromAddress, toAddress1, subject, Message)
client = New SmtpClient("Smtp.live.com")
client.Port = 587
Dim SMTPUserInfo As New System.Net.NetworkCredential("user@hotmail.com", "password")
client.Credentials = SMTPUserInfo
client.Send(mail)
MsgBox("sent")
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try