Is anybody capable of providing me with guidance, not opinions?

[HanneSThEGreaT]

First, an opinion is also guidance

Second, have a look at this article :

Working with Hashtables in .NET
http://www.codeguru.com/columns/vb/w...es-in-.net.htm

It explains how to use Hashtables

Then, have a look at this code :

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.Diagnostics;

using System.Collections; //The System.Collections namespace contains interfaces and classes that define various collections of objects, such as lists, queues, bit arrays, hashtables and dictionaries.


namespace CellNumber_Converter
{
    public partial class Form1 : Form
    {
        private Hashtable htPhoneNumbers = new Hashtable(); //hashtable to store keys + numbers
        private string strNumber;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            strNumber = textBox1.Text.ToUpper(); //convert entered text to uppercase

            foreach (char c in strNumber) //Loop through entered text
            {
                string digit = c.ToString(); //Convert to string

                if (htPhoneNumbers.ContainsKey(digit)) //if Entered text is any of the keys
                {
                    label1.Text += htPhoneNumbers[digit]; //add to label
                   

                }
            }
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            htPhoneNumbers["A"] = "2"; //Store the word "2" inside the hashtable at location "A"  etc.
            htPhoneNumbers["B"] = "2";
            htPhoneNumbers["C"] = "2";

            htPhoneNumbers["D"] = "3";
            htPhoneNumbers["E"] = "3";
            htPhoneNumbers["F"] = "3";

            htPhoneNumbers["G"] = "4";
            htPhoneNumbers["H"] = "4";
            htPhoneNumbers["I"] = "4";

            htPhoneNumbers["J"] = "5";
            htPhoneNumbers["K"] = "5";
            htPhoneNumbers["L"] = "5";

            htPhoneNumbers["M"] = "6";
            htPhoneNumbers["N"] = "6";
            htPhoneNumbers["O"] = "6";

            htPhoneNumbers["P"] = "7";
            htPhoneNumbers["Q"] = "7";
            htPhoneNumbers["R"] = "7";
            htPhoneNumbers["S"] = "7";

            htPhoneNumbers["T"] = "8";
            htPhoneNumbers["U"] = "8";
            htPhoneNumbers["V"] = "8";

            htPhoneNumbers["W"] = "9";
            htPhoneNumbers["X"] = "9";
            htPhoneNumbers["Y"] = "9";
            htPhoneNumbers["Z"] = "9";
        }
    }
}

Fourth, have a lookm at the attachment.

Fifth, Read the abovementioned article properly, else, this post helps you nothing - yes, it gives you the answer, but you will not learn anything from it if you don't do some research...