private void ButtonCreateContact_Click(object sender, EventArgs e)
        {
            bool noProblems = true;

            //Reset the colors of controls that change.
            TextBoxFullName.BackColor       = colorBackground;
            ComboBoxContactFolder.BackColor = colorBackground;
            TextBoxEmail1.BackColor         = colorBackground;
            TextBoxEmail2.BackColor         = colorBackground;
            TextBoxEmail3.BackColor         = colorBackground;

            //Check for required fields.
            if (TextBoxFullName.Text.Length == 0)
            {
                TextBoxFullName.BackColor = colorBackgroundError;
                noProblems = false;
            }

            if (ComboBoxContactFolder.Text.Length == 0)
            {
                ComboBoxContactFolder.BackColor = colorBackgroundError;
                noProblems = false;
            }

            //Check if there is at least one email.
            if ((TextBoxEmail1.Text.Length == 0) && (TextBoxEmail1.Text.Length == 0) && (TextBoxEmail1.Text.Length == 0))
            {
                TextBoxEmail1.BackColor = colorBackgroundError;
                noProblems = false;
            }

            //Check the email addresses are already in use.
            if (TextBoxEmail1.Text.Length > 0)
            {
                if (Contacts.DoesLookupContain(TextBoxEmail1.Text))
                {
                    TextBoxEmail1.BackColor = colorBackgroundError;
                    noProblems = false;
                }
            }
            if (TextBoxEmail2.Text.Length > 0)
            {
                if (Contacts.DoesLookupContain(TextBoxEmail2.Text))
                {
                    TextBoxEmail2.BackColor = colorBackgroundError;
                    noProblems = false;
                }
            }
            if (TextBoxEmail3.Text.Length > 0)
            {
                if (Contacts.DoesLookupContain(TextBoxEmail3.Text))
                {
                    TextBoxEmail3.BackColor = colorBackgroundError;
                    noProblems = false;
                }
            }

            //If all requirement are met then create the contact and add the details.
            if (noProblems)
            {
                Outlook.ContactItem newContact = Globals.ThisAddIn.Application.CreateItem(Outlook.OlItemType.olContactItem) as Outlook.ContactItem;
                newContact.FullName = TextBoxFullName.Text;
                if (TextBoxEmail1.Text.Length > 0)
                {
                    newContact.Email1Address = TextBoxEmail1.Text;
                }
                if (TextBoxEmail2.Text.Length > 0)
                {
                    newContact.Email2Address = TextBoxEmail2.Text;
                }
                if (TextBoxEmail3.Text.Length > 0)
                {
                    newContact.Email3Address = TextBoxEmail3.Text;
                }

                if (PictureBoxIcon.Image is object)
                {
                    newContact.AddPicture("Icon.png");
                }
                newContact.Save();
                Application.DoEvents();
                Thread.Sleep(100);
                //Op.EmailForCreatedContact = newContact.Email1Address;
                if (ComboBoxContactFolder.Text != "Contacts")
                {
                    newContact.Move(InTouch.Contacts.Folders[ComboBoxContactFolder.Text]);;
                }
                //Op.NextFormRegion = ContactFormRegion.InTouchSettings;
                if (newContact is object)
                {
                    Marshal.ReleaseComObject(newContact);
                }
            }

            if (noProblems)
            {
                Close();
            }
        }