Is there Any Code to include (A-Z) Letters?

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C#2.0

C#3.0

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C#4.0

C#3.5

is there any way to write a short code that includes the number (1-10) & Letters (A-Z) ..?? i mean without writing all of it in single lines?

** and btw... the code doesn't support Words? .. i mean when i say a word that doesn't typed there.. it can heart it ..
is there any way to do it ?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Speech;

namespace System.Speech.Recognition
{
    public partial class Form1 : Form
    {
        SpeechRecognizer rec = new SpeechRecognizer();

        public Form1()
        {
            InitializeComponent();
            rec.SpeechRecognized += rec_SpeechRecognized;
        }

        void rec_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            lblLetter.Text = e.Result.Text;
        }

        void Form1_Load(object sender, EventArgs e)
        {
            var c = new Choices();

            // Doens't work must use English words to add to Choices and
            // populate grammar.
            //
            //for (var i = 0; i <= 100; i++)
            //  c.Add(i.ToString());

            c.Add("one");
            c.Add("two");
            c.Add("three");
            c.Add("four");
            c.Add("hi");
            c.Add("hello");
            c.Add("I");
            c.Add("A");
            c.Add("B");
            c.Add("C");
            c.Add("D");
            c.Add("amer");
            // etc...

            var gb = new GrammarBuilder(c);
            var g = new Grammar(gb);
            rec.LoadGrammar(g);
            rec.Enabled = true;
        }

        private void lblLetter_Click(object sender, EventArgs e)
        {

        }

    }
}