VB.Net邮件发送[带附件]的实例

代码：

乐博网lob.cn提示：调试环境为 vs2005 +  windows2003 / windows2008 / xp / vista + .NET Framework 2.0

Imports System.Net.Mail
Imports System.Net
Public Class MailForm
    Dim message As MailMessage
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        SendSMTPEMail()
    End Sub
    Sub SendSMTPEMail()
        Dim client As System.Net.Mail.SmtpClient = New Net.Mail.SmtpClient
        client.UseDefaultCredentials = False
        client.Credentials = New System.Net.NetworkCredential(ComboBox3.Text, TextBox3.Text) ''用户名，密码
        client.DeliveryMethod = SmtpDeliveryMethod.Network
        client.Host = ComboBox1.Text
        If InStr(ComboBox3.Text, "@", CompareMethod.Text) <= 0 Or ComboBox3.Text.Length <= InStr(ComboBox3.Text, "@", CompareMethod.Text) Then
            MessageBox.Show("乐博网提示：源邮件地址错误！")
        ElseIf InStr(ComboBox2.Text, "@", CompareMethod.Text) <= 0 Or ComboBox2.Text.Length <= InStr(ComboBox2.Text, "@", CompareMethod.Text) Then
            MessageBox.Show("乐博网提示：目标邮件地址错误！")
        Else
            message = New System.Net.Mail.MailMessage(ComboBox3.Text, ComboBox2.Text, TextBox2.Text, RichTextBox1.Text)
            message.BodyEncoding = System.Text.Encoding.UTF8
            message.IsBodyHtml = True
            If TextBox1.Text.Trim <> "" Then  ''带附件  
                If Dir(TextBox1.Text.Trim) = "" Then
                Else
                    Dim attach As Net.Mail.Attachment = New Net.Mail.Attachment(TextBox1.Text)
                    message.Attachments.Add(attach)
                End If
            End If
            client.Send(message)
        End If
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If OpenFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
            TextBox1.Text = OpenFileDialog1.FileName
        End If
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Close()

    End Sub
End Class