c# Sending keyboard commands to another window / process

I am trying to write a program that will take a line of data and pass it into another window / process.

This is the code I have so far, but I have not been able to work out how I would send the keyboard command to the OUTLOOK process.

I would like to be able to use the Tab command / key and the Enter command / key.

This is what I have tried so far

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Windows.Forms;

namespace Config
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            System.Threading.Thread.Sleep(30);//300000
            TextReader tr = new StreamReader("config.txt");
            Clipboard.SetText(tr.ReadLine());
            tr.Close();

            var proc = Process.GetProcessesByName("OUTLOOK").FirstOrDefault();
            if (proc != null && proc.MainWindowHandle != IntPtr.Zero)
            {
                SetForegroundWindow(proc.MainWindowHandle);
                //SendKeys.Send("{ENTER}");
                //   Clipboard.GetText();
            }
        }

        [DllImport("user32")]
        private static extern bool SetForegroundWindow(IntPtr hwnd);
    }
}