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Send email in asp.net

 public DataTable All_Topik()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ASPNETDBConnectionString1"].ConnectionString);
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandText = "SELECT top(10) Message,Subject from B_Topics order by TopicID desc";
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        con.Close();
        return dt;
    }

 public DataTable All_Email()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ASPNETDBConnectionString1"].ConnectionString);
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandText = "SELECT email from [email]";
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        con.Close();
        return dt;
    }

 public static void MessageScript(string function, Page thispage)
    {
        thispage.ClientScript.RegisterStartupScript(thispage.GetType(), "msg", function, true);
    }

  protected void Btnsend_Click(object sender, EventArgs e)
    {
        try
        {
            DataTable dt = All_Topik();
            DataTable dt2 = All_Email();
            int ct = All_Topik().Rows.Count;
            int ce = All_Email().Rows.Count;
            for (int i = 0; i < ct; i++)
            {
                string msg = dt.Rows[i]["Message"].ToString();
                string sub = dt.Rows[i]["Subject"].ToString();
                MailMessage mail = new MailMessage("nava.mojtaba@yahoo.com", dt2.Rows[0]["email"].ToString());
                mail.Body = msg;
                mail.Subject = sub;
                mail.IsBodyHtml = true;
                mail.Priority = MailPriority.High;
                mail.BodyEncoding = Encoding.UTF8;
                mail.SubjectEncoding = Encoding.UTF8;
                mail.HeadersEncoding = Encoding.UTF8;
                mail.Headers.Add("Company", "FAKHRAVARY.SOMEE");
                mail.Headers.Add("Location", "Iran/Bousher");
                mail.Headers.Add("Tell", "09173700916");
                for (int b = 1; b < ce; b++)
                {
                    mail.Bcc.Add(dt2.Rows[b]["email"].ToString());
                }
                SmtpClient c = new SmtpClient("mail.zarcheckan.com", 25);
                c.Send(mail);
            }
        }
        catch
        {
            MessageScript("ERROR", this);
        }
    }
HTML page(Default.aspx):
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
        <ProgressTemplate>
      please wait....
        </ProgressTemplate>
    </asp:UpdateProgress>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Send" />
        </ContentTemplate>
    </asp:UpdatePanel>
    </form>
</body>
</html>
The last step in the Web server configuration is set to work. As follows:
 <system.net>
      <mailSettings>
        <smtp from="fakhr@a-velayat.com">
          <network host="mail.a-velayat.com" password="fakhravary" userName="fakhr@a-velayat.com" />
        </smtp>
      </mailSettings>
    </system.net>

hi friends.
In this section of the code that I'm going to tell you that you can email.
The first step is to create a new web application. Following method to the page, write the subject, body, desire, send, sending you specify.
{{ tag }}, {{tag}},

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}
{{ parent.authors[0].realName || parent.author}}

{{ parent.authors[0].tagline || parent.tagline }}

{{ parent.views }} ViewsClicks
Tweet

{{parent.nComments}}