Tag Archives: C#

11 Sep

C# yield keyword

If we use the yield keyword in a statement, we indicate that the method, operator, or get accessor in which it appears is an iterator.

Two forms of the yield statement are used.

   yield return <expression>;
   yield break;

We use a “yield return” statement to return each element one at a time.
We use a “yield break” statement to end the iteration.

Usage : 

            // Display powers of 2 up to the exponent of 10: 
            foreach (int i in Power(2, 10))
            {
                Console.Write("{0} ", i);
            }
            // Output: 2 4 8 16 32 64 128 256 512 1024

Sample : 

        public System.Collections.Generic.IEnumerable <int> Power(int number, int exponent)
        {
            int result = 1;
            for (int i = 0; i < exponent; i++)
            {
                result = result * number;
                yield return result;
            }
        }
10 Sep

C# Send an Email with Attachment from GMail

This example shows how to send an email with attachment from GMail.
To send an email using GMail, we need to add a reference to the dynamic link library System.Net.Mail.
To do this:

  • Go to solution explorer of your project
  • Select add a reference
  • Click on .Net Tab
  • Select System.Net.Mail.

The GMail SMTP Server requires an encrypted connection (SSL) on port 587.

Sample : 

        public void SendMailUsingGMail()
        {
            try
            {
                MailMessage mailMessage = new MailMessage();
                mailMessage.From = new MailAddress("sender@gmail.com");

                //receiver email adress
                mailMessage.To.Add("receiver@gmail.com");

                //subject of the email
                mailMessage.Subject = "This is a subject";

                //attach the file
                mailMessage.Attachments.Add(new Attachment(@"C:\\attachedfile.jpg"));
                mailMessage.Body = "Body of the email";
                mailMessage.IsBodyHtml = true;

                //SMTP client
                SmtpClient smtpClient = new SmtpClient("smtp.gmail.com");
                //port number for gmail
                smtpClient.Port = 587;
                //credentials to login in to Gmail account
                smtpClient.Credentials = new NetworkCredential("sender@gmail.com", "password");
                //enabled SSL
                smtpClient.EnableSsl = true;
                //Send an email
                smtpClient.Send(mailMessage);
            }
            catch (Exception ex)
            {

            }
        }
10 Sep

C# Send an Email with Attachment from HotMail

This example shows how to send an email with attachment from HotMail.
To send an email using HotMail, we need to add a reference to the dynamic link library System.Net.Mail.
To do this:

  • Go to solution explorer of your project
  • Select add a reference
  • Click on .Net Tab
  • Select System.Net.Mail.

The HotMail SMTP Server requires an encrypted connection (SSL) on port 25.
Sample : 

        public void SendMailUsingHotmail()
        {
            try
            {
                MailMessage mailMessage = new MailMessage();
                mailMessage.From = new MailAddress("sender@hotmail.com");
                
                //receiver email adress
                mailMessage.To.Add("receiver@gmail.com");
                
                //subject of the email
                mailMessage.Subject = "This is a subject";
                
                //attach the file
                mailMessage.Attachments.Add(new Attachment(@"C:\\attachedfile.jpg"));
                mailMessage.Body = "Body of the email";
                mailMessage.IsBodyHtml = true;
                
                //SMTP client
                SmtpClient smtpClient = new SmtpClient("smtp.live.com");
                //port number for Hot mail
                smtpClient.Port = 25;
                //credentials to login in to hotmail account
                smtpClient.Credentials = new NetworkCredential("sender@hotmail.com", "password");
                //enabled SSL
                smtpClient.EnableSsl = true;
                //Send an email
                smtpClient.Send(mailMessage);
            }
            catch (Exception ex)
            {

            }
        }
10 Sep

C# Send an Email with Attachment from Yahoo

This example shows how to send an email with attachment from Yahoo.
To send an email using Yahoo, we need to add a reference to the dynamic link library System.Net.Mail.
To do this:

  • Go to solution explorer of your project
  • Select add a reference
  • Click on .Net Tab
  • Select System.Net.Mail.

The Yahoo SMTP Server requires an encrypted connection (SSL) on port 587.

Sample : 

        public void SendMailUsingYahoo()
        {
            try
            {
                MailMessage mailMessage = new MailMessage();
                mailMessage.From = new MailAddress("sender@yahoo.com");

                //receiver email adress
                mailMessage.To.Add("receiver@gmail.com");

                //subject of the email
                mailMessage.Subject = "This is a subject";

                //attach the file
                mailMessage.Attachments.Add(new Attachment(@"C:\\attachedfile.jpg"));
                mailMessage.Body = "Body of the email";
                mailMessage.IsBodyHtml = true;

                //SMTP client
                SmtpClient smtpClient = new SmtpClient("smtp.mail.yahoo.com");
                //port number for Yahoo
                smtpClient.Port = 587;
                //credentials to login in to yahoo account
                smtpClient.Credentials = new NetworkCredential("sender@yahoo.com", "password");
                //enabled SSL
                smtpClient.EnableSsl = true;
                //Send an email
                smtpClient.Send(mailMessage);
            }
            catch (Exception ex)
            {

            }
        }
09 Sep

Optional Argument in C# 4.0

This example shows how to use of Optional Argument in C# 4.0.

Each optional parameter has a default value as its part of the definition. If no argument is sent for the optional parameter, default value is being used. Also, default value of the optional parameter must be constant and optional parameter must define at the end of the all required parameter. It can be applied on constructor, method, and indexer.

Usage : 

            OptionalArgument("Test", 123);
            OptionalArgument("Test", 123, optionalParam2:"New Default 2");

Sample Method : 

        private void OptionalArgument(string requiredParam1, 
                                      int requiredParam2, 
                                      string optionalParam1 = "Default 1", 
                                      string optionalParam2 = "Default 2")
        {
            //do anything
        }