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MailKit receive emails doesn't show message.Body

I'm receiving emails OK, except that message.TextBody is showing a blank when there is a message present.
message.HtmlBody shows the body text amongst a whole lot of html stuff, obviously, but I'm looking for message.TextBody.
message.TextBody.ToString() shows an error
Object reference not set to an instance of an object
I'm using the following code:
client.ServerCertificateValidationCallback = (s, c, h, e) => true;
client.SslProtocols = System.Security.Authentication.SslProtocols.Tls12;
client.Connect("pop.gmail.com", 995, true);
client.AuthenticationMechanisms.Remove("XOAUTH2");
client.Authenticate("aaaa#gmail.com", "ssss");
gstrEmailMessages = gstrEmailMessages + client.Count + "\n";
//Fetch emails:
for (int i = 0; i < client.Count; i++)
{
var message = client.GetMessage(i);
gstrEmailMessages = gstrEmailMessages + "Subject: " + message.Subject + "\n";
gstrEmailMessages = gstrEmailMessages + "TextBody: " + message.TextBody + "\n";
gstrEmailMessages = gstrEmailMessages + "HtmlBody: " + message.HtmlBody + "\n";
}
//Disconnect connection:
client.Disconnect(true);
Why does message.TextBody show a blank?

Not all messages will have both an HTML and a plain-text body. In fact, it's possible for some messages to have neither.
In general, though, most messages will have at least 1 of those.

Property or indexer "Attachments" cannot be assigned to -- it is read only

I´m trying to send mail with image attachment, but it still throwing error
(*Property or indexer "Attachments" cannot be assigned to -- it is read only *)
string pathToPic = #"c:\MyDir\Img\img"+ automaticalyGeneratedNumber.toString() + ".png";
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = Environment.MachineName,
Body = "PC NAME : " + Environment.MachineName + "\r\nIP ADRESS : " + Dns.GetHostEntry(Dns.GetHostName()).AddressList[1],
Attachments = new Attachment(#"c:\MyDir\Img" + "/img" + (Saving.CountImagesTaken(#"c:\MyDir\Img") - 1).ToString() + ".png"),
})
{
smtp.Send(message);
}

Why complicate the code like that. You need to use message.Attachments.Add since the Attachments property is read-only :
var message = new MailMessage(fromAddress, toAddress)
{
Subject = Environment.MachineName,
Body = "PC NAME : " + Environment.MachineName + "\r\nIP ADRESS : " + Dns.GetHostEntry(Dns.GetHostName()).AddressList[1],
};
message.Attachments.Add(new Attachment(#"c:\MyDir\Img" + "/img" + (Saving.CountImagesTaken(#"c:\MyDir\Img") - 1).ToString() + ".png"));
using (message)
{
smtp.Send(message);
}

C#.NET send email based on two conditions

I have the following code segment that sends an email to users based on 'RequestApproval' being set to true on their records in a SQL table - it works perfectly.
SmtpClient mySmtpClient = new SmtpClient();
List<SigList> LST_SigList = LK_CRFData.SigLists.Where(x => x.RequestApproval == true).ToList();
string URL = sponsorURL + OB_CRF.id;
foreach (SigList OB_SigList in LST_SigList)
{
string Name = OB_SigList.UserName.Trim();
Name = Name.Substring(0, Name.IndexOf("."));
Name = Name[0].ToString().ToUpper() + Name.Substring(1, Name.Length - 1);
MailMessage myMessage = new MailMessage("SponsorApproved#nhs.net", OB_SigList.EmailAddress);
myMessage.Subject = "Sponsor has approved the request on the " + TB_DateTimeofImplementationStart.Text.Substring(0, 10) + " for \"" + TB_CNNO.Text + " " + TB_Title.Text + "\"";
myMessage.Body = "Dear " + Name + ", \n\nThe sponsor has now approved CN NO : " + TB_CNNO.Text + "\nTitle : " + TB_Title.Text + "\nImplementation Date : " + TB_DateTimeofImplementationStart.Text.Substring(0, 10) + "\n\nClick the link to open the document:\n" + URL;
mySmtpClient.Send(myMessage);
}
However, for certain functions, I want to send the email where 'Request approval is set to True OR False. I've ammended it to the following to no avail:
List<SigList> LST_SigList = LK_CRFData.SigLists.Where(x => x.RequestApproval == true || x.RequestApproval == false).ToList();
It still sends emails out the old way -only to those who have Request Approval' set to true.
Any ideas?
Thanks

\n isn't working in sending emails

I've made a code which sends mail through form. This is my method:
protected void SendMail()
{
string firstName = fName.Text.ToString();
string lastName = lName.Text.ToString();
string event = eventName.Text.ToString();
string phoneNum = phone.Text.ToString();
string pass1 = pass.Text.ToString();
string address1=address.Text.ToString();
string email = gmail.Text.ToString();
string body = "From: " + firstName+" " +lastName+ "\n";
string subject = "title " + event;
body += "Email: " + email + "\n";
body += "Event: " + event + "\n";
body += "Phone Number: " + phoneNum + "\n";
body += "Password: " + pass1 + "\n";
body += "Event address: " + address1 + "\n";
// smtp settings
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
mail.To.Add("aaaaa#gmail.com");
mail.From = new MailAddress("aaaaa#gmail.com", "title", System.Text.Encoding.UTF8);
mail.Subject = "title";
mail.SubjectEncoding = System.Text.Encoding.UTF8;
mail.Body = body;
mail.BodyEncoding = System.Text.Encoding.UTF8;
mail.IsBodyHtml = true;
mail.Priority = System.Net.Mail.MailPriority.High;
SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential("aaaa#gmail.com", "password");
client.Port = 587;
client.Host = "smtp.gmail.com";
client.EnableSsl = true;
try
{
client.Send(mail);
Response.Redirect("sadasd.aspx");
}
catch (Exception ex)
{
}
}
My Problem is that the email is a big mess and the \n isn't working. How can I get a line down? Why isn't it working?

I this "\n" should be replaced with "<br />". and StringBuilder will be more suitable to build the MailMessage, the code will be like the following:
StringBuilder mailBodyBuilder = new StringBuilder();
mailBodyBuilder.Append("From: " + firstName +" " + lastName + "<br />");
mailBodyBuilder.Append("Email: " + email + "<br />");
mailBodyBuilder.Append("Event: " + event + "<br />");
mailBodyBuilder.Append("Phone Number: " + phoneNum + "<br />");
mailBodyBuilder.Append("Password: " + pass1 + "<br />");
mailBodyBuilder.Append("Event address: " + address1 + "<br />");
// rest of contents here
// send the mail

.Net.Mail body message lose the format while is sent c# .net

I'm using a string builder to create a body message while trying to do something.
the issue es I'm getting the value from the string builder and this one is formatted.
Example from my string builder:
Following files were attached by email:
1. C:\SALASFRI2_20150824094158_ScrubLog.txt - Record Count: 8
2. C:\SALASFRI2_20150824102328_ScrubLog.txt - Record Count: 8
3. C:\SALASFRI2_20150824102516_ScrubLog.txt - Record Count: 8
4. C:\SALASFRI2_20160121125353_ScrubLog.txt - Record Count: 8
5. C:\SALASFRI2_20160121125659_ScrubLog.txt - Record Count: 8
===================================================
Total Files: 5
Please contact your system administrator for any further assitance.
That's exactly how the stringbuilder looks, but when the email arrived, it lose their format as follow:
do you know if there is a property to don't lose the format when it arrive to my email?
This is my code:
if (Notification.IncludeFileName || Notification.IncludeRecordCount)
{
BodyMessage.Append("Following files were attached by email: \n");
for (int index = 0; index < NumberOfFiles; index++)
{
if (Notification.IncludeFileName && Notification.IncludeRecordCount)
BodyMessage.Append((index + 1) + ". " + LocalFiles[index] + " - Record Count: " + File.ReadLines(LocalFiles[index]).Count() + "\n");
else
BodyMessage.Append((index + 1) + ". " + LocalFiles[index] + File.ReadLines(LocalFiles[index]).Count() + "\n");
}
}
if (Notification.IncludeNumberOfFiles)
{
BodyMessage.Append("\n===================================================\n\n");
BodyMessage.Append("Total Files: " + NumberOfFiles + "\n");
}
BodyMessage.Append("\nPlease contact your system administrator for any further assitance.");
////////////////////END OF SUBJECT AND BODY MAIL MESSAGE VALIDATION
////////............SEND THE ATTACHMENTS THROUGH EMAIL................///////////
try
{
MailMessage Email = new MailMessage();
SmtpClient smtp = new SmtpClient(AppConfiguration.SMTPServer);
Email.From = new MailAddress(AppConfiguration.EmailAddress);
Email.To.Add(protocol.SMTPEmailList);
Email.Subject = EmailSubject;
Email.Body = BodyMessage.ToString();
if (directories.Zip)
Email.Attachments.Add(new Attachment(ZipName));
else
foreach (var attachment in LocalFiles)
{
Email.Attachments.Add(new Attachment(attachment));
}
smtp.Port = AppConfiguration.SmtpPort;
smtp.UseDefaultCredentials = true;
smtp.Send(Email);
Email.Dispose();

You probably need to use "\r\n" as your newline sequence instead of just "\n".