How to make external dict file for my keyword speech recognition C# program.

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C#

What I want is to let C# Keyword Speech Recognition program load keywords from a text file.dict, instead of type keywords in program's array. The code below is a working program but if I want to add thousands new keywords in array that will make string[]{array} so large and I have to rebuild project every time whenever I do keywords list modification. If I can let program load a keywords text or string file when program is started so I can modify the external keyword dictionary file anytime I want without compiling code.


using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Speech.Recognition;
using System.Speech.Synthesis;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Globalization;
using System.IO;

//Speech to Text
amespace CSharp_Speech_ConsoleApp

{
class Program
{

[DllImport("winmm.dll")]

public static extern int waveInGetNumDevs();

SpeechRecognitionEngine recognizer = new
SpeechRecognitionEngine(new
System.Globalization.CultureInfo("en-US"));

static void Main(string[] args)
{
// Make a Keywords array
Choices commands = new Choices();
//How to make this array by importing strings from an external keywords file ?
commands.Add(new String[] { "Good morning.","Hello Mike.",
"Good morning Eddy.","Good afternoon.","Good Evening","Hello",
"How are you", "Listen to me Mike", "Stop listening Mike!"
});

GrammarBuilder gBuilder = new GrammarBuilder();

gBuilder.Append(commands);
Grammar grammar = new Grammar(gBuilder);

recogEngine.LoadGrammar(grammar);


//get total number of sound input devices

int waveInDevicesCount = waveInGetNumDevs();

if(waveInDevicesCount == 0)
{
Console.WriteLine("No microphone detected.!");

}

else

{
Console.WriteLine("Microphone detected. ");

recogEngine.SetInputToDefaultAudioDevice();

recogEngine.SpeechRecognized += recogEngine_SpeechRecognized;

recogEngine.RecognizeAsync(RecognizeMode.Multiple);

}

Console.ReadLine();
}
// Console Display Speech Recognized result Text
static void recogEngine_SpeechRecognized(object sender,
SpeechRecognizedEventArgs e)
{

string managedString = e.Result.Text;

char[] st = managedString.ToCharArray();

Console.WriteLine(st);

}

}

}

What I have tried:

I have tested some way , such as make array first and use variable replace the string array commands.Add(new String[] { (arr1) }; :

string[] arr1 = new string[] { "Good morning.","Hello Mike.", "Good morning Eddy.","Good afternoon.","Good Evening","Hello", "How are you", "Listen to me Mike", "Stop listening Mike!" };

I use arr1 replace the { } content like this :
.. Choices commands = new Choices();
.. commands.Add(new String[] { (arr1) } ;

but I found this array can not be replaced by a equivalent variable arr1. If this array can be replaced by arr1 then I can create array arr1 by importing a text file that contents keywords when program start. How to replace this keyword string array by another array variable ?