急啊。大家帮我看一下这个发邮件的问题？

大家帮我找一下错

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Mail;



namespace Emal
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void go()
{
MailMessage mm = new MailMessage();

//发件人
mm.From = new MailAddress("1083678603@qq.com", "张勇强");

//收件人(可以是多个)
mm.To.Add(new MailAddress("785798530@qq.com"));



//主题
mm.Subject = "邮件的主题";

//邮件正文
mm.Body = "body";
// mm.SubjectEncoding = System.Text.Encoding.GetEncoding(963);//如果是乱码就需要此转码

// mm.SubjectEncoding = System.Text.Encoding.ASCII;//

SmtpClient sc = new SmtpClient();

//设置SMTP主机的名称或IP地址
sc.Host = "smtp.qq.com";

string User = "1083678603@qq.com";
string PassWord = "1049314973asd?";
//设置用于验证发件人身份的凭据
sc.Credentials = new System.Net.NetworkCredential(User, PassWord);
//try
//{

sc.Send(mm); MessageBox.Show("success");
//}
//catch (Exception ex) { MessageBox.Show("fail"); }

}

private void Form1_Load(object sender, EventArgs e)
{
go();

//sssssssss
}
}
}