用.net发送email

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<% @ Page Language="C#" %>
<% @ Import Namespace="System.Web.Mail" %>
<Script Language="C#" Runat="Server">
public void Mail_Send(Object src,EventArgs e)
{
    //创建MailMessage对象
    MailMessage MyMsg = new MailMessage();
    MyMsg.From        = tbFrom.Text;
    MyMsg.To        = tbTo.Text;
    MyMsg.Subject    = tbSubject.Text;
    MyMsg.Priority    = (MailPriority)ddlPriority.SelectedIndex;
    MyMsg.BodyFormat= (MailFormat)ddlBodyFormat.SelectedIndex;
    MyMsg.Body        = tbBody.Text;

    //如果有附件则上传
    HttpPostedFile hpfFile = AttachFile.PostedFile;
    if(hpfFile.FileName!="")
    {
        //有附件，则上传到Temp目录中
        //取得文件名(不含路径)
        char[] de = {'/'};
        string[] AFilename  = hpfFile.FileName.Split(de);
        string strFilename  = AFilename[AFilename.Length-1];
        string strPath        = Server.MapPath(".")+"/Temp/"+strFilename;
        hpfFile.SaveAs(strPath);
        //添加附件
        MyMsg.Attachments.Add(new MailAttachment(strPath));
    }

    try
    {
        //发送
        SmtpMail.Send(MyMsg);
        lblShowMsg.Text ="发送成功";
        tbTo.Text        = "";
        tbSubject.Text    = "";
        tbBody.Text        = "";
        ddlPriority.SelectedIndex = 1;
        ddlBodyFormat.SelectedIndex = 0;
    }
    catch(Exception ee)
    {
        lblShowMsg.Text = "发送失败:"+ee.ToString();
    }
}
</script>
<html>
<head>
<title></title>
</head>
<body>
<form Enctype="multipart/form-data" runat="server">
<b>演示发送邮件附件</b>
<table border=1>
<tr><td colspan="2"><b>功能强大的邮件发送</b></td></tr>
<tr><td colspan="2"><asp:Label id="lblShowMsg" ForeColor="red" runat="server" /></td></tr>
<tr><td>收件人：</td><td><asp:TextBox id="tbTo" runat="server" /></td></tr>
<tr><td>发件人：</td><td><asp:TextBox id="tbFrom" runat="server" /></td></tr>
<tr><td>邮件主题：</td><td><asp:TextBox id="tbSubject" runat="server" /></td></tr>
<tr>
    <td>优先级： <asp:DropDownList id="ddlPriority" runat="server">
                    <asp:ListItem Value="High">高</asp:ListItem>
                    <asp:ListItem Value="Normal" Selected>普通</asp:ListItem>
                    <asp:ListItem Value="Low">低</asp:ListItem>
                </asp:DropDownList>
    </td>
    <td>邮件格式：<asp:DropDownList id="ddlBodyFormat" runat="server">
                    <asp:ListItem Value="Text">文本格式</asp:ListItem>
                    <asp:ListItem Value="Html">HTML格式</asp:ListItem>
                </asp:DropDownList>
    </td>
</tr>
<tr><td colspan="2">邮件内容:</td></tr>
<tr><td colspan="2"><asp:TextBox TextMode="MultiLine" Rows="5" Columns="50" id="tbBody" runat="server" /></td></tr>
<tr><td>邮件附件：</td><td><input type="file" id="AttachFile" runat="server" /></td></tr>
<tr><td><asp:Button id="btnSend" Text="发送" OnClick="Mail_Send" runat="server" /></td></tr>
</table>
</form>
</body>
</html>