Leave management workflow using Windows Workflow Foundation

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.ComponentModel.Serialization;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Runtime;
using System.Workflow.Activities;
using System.Workflow.Activities.Rules;
using System.Net.Mail;
using System.Configuration;

namespace SampleWorkflow_LM
{
    /// <summary>
    /// author:praveen alwar
    /// </summary>
    public sealed partial class Requestworkflow : SequentialWorkflowActivity
    {
        /// <summary>
        /// hashtable to hold the email data
        /// </summary>
        private Hashtable _requestordata;

        public Hashtable requestorleavedata
        {
            get { return _requestordata; }
            set { _requestordata = value; }
        }
        //mailer class to be sent to the smtp server
        private MailData _maildata = new MailData();

        /// <summary>
        /// this method will be invoked from the approver notification code activity
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NotifyApprover(object sender, EventArgs e)
        {

            try
            {

                ////Send email to Approver
                fillMailClass(0);
                bool ismailsent = SendMail(_maildata);
            }
            catch (Exception ex)
            {
                //log the error

            }

        }

        /// <summary>
        /// this method will be invoked from the applier notification code activity
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NotifyApplier(object sender, EventArgs e)
        {

            try
            {

                ////Send email to Applier
                fillMailClass(1);
                bool ismailsent = SendMail(_maildata);
            }
            catch (Exception ex)
            {
                //log the error

            }

        }

        private void fillMailClass(int mailtype)
        {
            //if mailtype ->0 then approver notification, mail type->1 , then notify applier

            switch (mailtype)
            {
                case 0:
                    #region build the email details class for approver
                    _maildata.MailTo = requestorleavedata["rmemail"].ToString() ;
                    _maildata.MailSubject = ConfigurationManager.AppSettings["NewLeaveRequest"].ToString();
                    _maildata.MailFrom = ConfigurationManager.AppSettings["mailfrom"].ToString();
                    _maildata.MailBody = requestorleavedata["emailbody"].ToString();
                    //_maildata.IsHtmlBody = true;

                    #endregion
                    break;
                case 1:
                    #region build the email details class for resource
                    _maildata.MailTo = requestorleavedata["resourceemail"].ToString();
                    #endregion
                    break;

            }
        }

        private static bool SendMail(MailData emailDetails)
        {
            //Instantiate the MailMessage Class from the framework.Mail message class represents the email that has to be sent
            MailMessage message = new MailMessage();
            //counter is used to check the number of MAILTO instances

            try
            {
                //Read the message from settings
                message.From = new MailAddress(emailDetails.MailFrom);
                //Check if the mailto is not null
                if (emailDetails.MailTo != null)
                {
                    // Add all recipent of mail

                        message.To.Add(new MailAddress(emailDetails.MailTo));
                  }


                 message.Body = emailDetails.MailBody;
                //check if the email has to be sent in HTML format
                  message.BodyEncoding = System.Text.Encoding.Unicode;
                //assign the mail subject
                message.Subject = emailDetails.MailSubject;

                //double-check if mail to has been supplied. atleast one email address has to be provided.
                if (emailDetails.MailTo != null)
                {
                    //Instantiate the SMTP client to send the email
                    SmtpClient client = new SmtpClient();

                     client.Send(message);
                }
                else
                {
                    //if the mail to is not specified, log error and return false
                    //log the error
                    return false;
                }
            }
            catch (SmtpException ex)
            {
                //catch and log the error
                ex.Data.Add("Error sending mail", ex.InnerException.Message);
               //log the error
                return false;
            }
            catch (Exception ex)
            {
                //catch and log the error
                ex.Data.Add("Error sending mail", ex.InnerException.Message);
               //log the error
                return false;
            }
            finally
            {
                message.Dispose();
            }

            return true;
        }



        public Requestworkflow()
        {
            InitializeComponent();
        }
    }

}