发送邮件

1.制作客户端邮件发送系统（winform版）

前台：

后台

private void button1_Click(object sender, EventArgs e)
{
MailMessage msg = new MailMessage();
msg.Subject = this.textBox2.Text;
msg.Body = this.textBox3.Text;

msg.From = new MailAddress("1059625015@qq.com");
msg.To.Add(textBox1.Text);
msg.IsBodyHtml = true;

SmtpClient client = new SmtpClient();
client.Host = "smtp.qq.com"; //发件方服务器地止
client.Port = 25; //发件方端口

NetworkCredential credential = new NetworkCredential();
credential.UserName = "1059625015";
credential.Password = "57483985shang146";

client.Credentials = credential; //把证书交给代理

Attachment att = new Attachment(this.textBox4.Text);
msg.Attachments.Add(att);
client.Send(msg);
}

private void button2_Click(object sender, EventArgs e)
{
if (this.openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox4.Text = this.openFileDialog1.FileName;
}
}

2.实现用户注册时，向其油箱发送激活码邮件，并进行状态处理。

login前台：

<div>

<table style="width:100%;">
<tr>
<td>
用户名：</td>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
密码：</td>
<td>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Email:</td>
<td>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="注册" />
</td>
<td>
 </td>
</tr>
</table>

</div>

login后台：

protected void Button1_Click(object sender, EventArgs e)
{
string userName = TextBox1.Text.Trim();
string pwd = TextBox2.Text.Trim();
string email = TextBox3.Text.Trim();
string activeCode = Guid.NewGuid().ToString().Substring(0,6);

string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
SqlConnection conn = new SqlConnection(conStr);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into T_Eamil (FUserName,FPassword,FEmail,FActive,FActiveCode) values

(@name,@pwd,@email,@active,@activeCode) select @@IDENTITY";
cmd.Parameters.Add(new SqlParameter("name", userName));
cmd.Parameters.Add(new SqlParameter("pwd",pwd));
cmd.Parameters.Add(new SqlParameter("email", email));
cmd.Parameters.Add(new SqlParameter("active", false));
cmd.Parameters.Add(new SqlParameter("activeCode", activeCode));
int num=Convert.ToInt32(cmd.ExecuteScalar());
sendMail(email, activeCode, num);

Response.Redirect("loginMessage.aspx");
conn.Close();
conn.Dispose();

}

protected void sendMail(string email,string activeCode,int id)
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("1059625015@qq.com");
msg.To.Add(email);
msg.Subject = "请激活注册";

StringBuilder contentBuilder = new StringBuilder();
contentBuilder.Append("请单击以下连接完成激活！");
contentBuilder.Append("<a href='http://localhost:2533/index.aspx?id=" + id.ToString() + "&activeCode="

+ activeCode + "'>激活</a>");
msg.Body = contentBuilder.ToString();
msg.IsBodyHtml = true;

SmtpClient client = new SmtpClient();
client.Host = "smtp.qq.com";
client.Port = 25;

NetworkCredential credential = new NetworkCredential();
credential.UserName = "1059625015";
credential.Password = "57483985shang146";

client.Credentials = credential;
client.Send(msg);
}

loginMessage前台

<div>
恭喜您注册成功。。。。。。。。。。。。。
</div>

index后台

protected void Page_Load(object sender, EventArgs e)
{
int id = Convert.ToInt32(Request["id"]);
string activeCode = Request["activeCode"].ToString();
int num = 0;
string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
SqlConnection conn = new SqlConnection(conStr);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "select * from T_Eamil where Id=@id";
cmd.Parameters.Add(new SqlParameter("id",id));
SqlDataReader read=cmd.ExecuteReader();
if (read.Read())
{
if (read.GetString(read.GetOrdinal("FActiveCode")) == activeCode)
{
num = 1;
}
else
{
num = 0;
Response.Write("验证码不正确");
}
}
else
{
Response.Write("用户不存在！！");
}

conn.Close();
conn.Dispose();

if (num == 1)
{
SqlConnection conn1 = new SqlConnection(conStr);
conn1.Open();
SqlCommand cmd1 = conn1.CreateCommand();
cmd1.CommandText = "update T_Eamil set FActive='True' where Id=@id1";
cmd1.Parameters.Add(new SqlParameter("id1", id));
cmd1.ExecuteNonQuery();
conn1.Close();
conn1.Dispose();
}
}