Windows Forms: Send and Receive email in Microsoft Outlook using C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "OutlookMail" and then click OK

Step 2: Design your form as below

You need to install Microsoft Outlook, then add a reference to Microsoft.Office.Interop.Outlook.dll

Step 3: Add code to handle your form as below

using System;
using System.Data;
using System.Windows.Forms;
using Outlook = Microsoft.Office.Interop.Outlook;

namespace OutlookMail
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            try
            {
                //Using COM to send email
                Outlook._Application _app = new Outlook.Application();
                Outlook.MailItem mail = (Outlook.MailItem)_app.CreateItem(Outlook.OlItemType.olMailItem);
                mail.To = txtTo.Text;
                mail.Subject = txtSubject.Text;
                mail.Body = txtMessage.Text;
                mail.Importance = Outlook.OlImportance.olImportanceNormal;
                ((Outlook._MailItem)mail).Send();
                MessageBox.Show("Your message has been successfully sent.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        DataTable dt;
        private void btnReceive_Click(object sender, EventArgs e)
        {
            try
            {
                Outlook._Application _app = new Outlook.Application();
                Outlook._NameSpace _ns = _app.GetNamespace("MAPI");
                Outlook.MAPIFolder inbox = _ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);
                _ns.SendAndReceive(true);
                dt = new DataTable("Inbox");
                dt.Columns.Add("Subject", typeof(string));
                dt.Columns.Add("Sender", typeof(string));
                dt.Columns.Add("Body", typeof(string));
                dt.Columns.Add("Date", typeof(string));
                dataGrid.DataSource = dt;
                foreach (Outlook.MailItem item in inbox.Items)
                    dt.Rows.Add(new object[] { item.Subject, item.SenderName, item.HTMLBody, item.SentOn.ToLongDateString() + " " + item.SentOn.ToLongTimeString() });
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void dataGrid_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            //Display email as html
            if (e.RowIndex < dt.Rows.Count && e.RowIndex >= 0)
                webBrowser.DocumentText = dt.Rows[e.RowIndex]["Body"].ToString();
        }
    }
}

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