1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:

       
            do
            {
                dummy2 = sr_log2.ReadLine();
                lstBody.Items.Add(dummy2);
                dummy2 = body;
            } 
            while (sr_log2.EndOfStream == false);


MailMessage dieMail = new MailMessage("abc@xyz.de", dummy, subject,body());					

1:

body += dummy2;					

1:
2:

TextBox tx = new TextBox();
tx.Multiline = true;					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using email.Properties;
using System.Net.Mail;
using System.Net.Mime;

namespace email
{
    public partial class Form1 : Form
    {
        string name, dummy, dummy2, emailinhalt;


        public Form1()
        {


            InitializeComponent();

        }
        private void btnAnhang_Click(object sender, EventArgs e)
        {
            //nur PDF anzeigen; PDF Datei auswählen;
            name = Settings.Default.name;
            StreamReader sr_log = new StreamReader(name);


            dummy = sr_log.ReadLine();
            txtbcc.Text = (dummy + ";");


            openFile.Filter = "nurPDF|*.pdf";

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                lblanhang.Text = ("Folgende Datei wurde angehängt: " + openFile.FileName);
                lblanhang.Visible = true;
            }
        }

        private void btnSenden_Click_1(object sender, EventArgs e)
        {

            emailinhalt = Settings.Default.emailinhalt;
            
            StreamReader sr_log2 = new StreamReader(emailinhalt);
            string subject = txtbetreff.Text;
            string body = dummy2 ;

//            char[] crlf = { (char)13, (char)(10) };



            do
            {
                dummy2 = sr_log2.ReadLine();

                //if (dummy2 == "")
                //{
                //    dummy2 = Environment.NewLine;
                //}
                lstBody.Items.Add(dummy2);
                body = body + (dummy2 +(char)'\u2305');
            }
            while (sr_log2.EndOfStream == false);

                MailMessage dieMail = new MailMessage("xya@web.de", dummy, subject, body);
                body = dieMail.Body;       

                dieMail.Attachments.Add(new Attachment(openFile.FileName.ToString()));
                //dieMail.IsBodyHtml =true;
                //string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192' ,'\u2305'});
                //dieMail.Body += Environment.NewLine + someArrows;
                //dieMail.BodyEncoding = System.Text.Encoding.UTF8;

                SmtpClient Server = new SmtpClient("abc@def.loc");
                Server.Send(dieMail);

        }
    }
}