Create new Windows 10 project to know how to create windows 10 projects refer my previous article:

Now create two button one id for send email and one is for send SMS.

To send E-mail

First we are going to see how to send email .Write the below code:
  1. private async void ComposeEmail(Contact Torecipient, string messageBody)
  2. {
  3. var to = Torecipient.Emails.FirstOrDefault < Windows.ApplicationModel.Contacts.ContactEmail > ();
  4. var emailRecipient = new Windows.ApplicationModel.Email.EmailRecipient(to.Address);
  5. EmailMessage objEmail = new EmailMessage();
  6. objEmail.Subject = "Suresh";
  7. objEmail.To.Add(emailRecipient);
  8. await EmailManager.ShowComposeNewEmailAsync(objEmail);
  9. }
You can attach files also while sending email to attach the files write the below code before compose the email task.
  1. var stream = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(attachment);
  3. var attachment = new Windows.ApplicationModel.Email.EmailAttachment(
  4. attachment.Name,
  5. stream);
  6. emailMessage.Attachments.Add(attachment);
To send SMS

To send an SMS write the below code:
  1. private async void ComposeSMS(Contact toContatc, string message)
  2. {
  3. var chatMessage = new Windows.ApplicationModel.Chat.ChatMessage();
  4. chatMessage.Body = message;
  5. var phone = toContatc.Phones.FirstOrDefault < Windows.ApplicationModel.Contacts.ContactPhone > ();
  6. chatMessage.Recipients.Add(phone.Number);
  7. await Windows.ApplicationModel.Chat.ChatMessageManager.ShowComposeSmsMessageAsync(chatMessage);
  8. }