C# Generating a random number in while loop [duplicate]

This question already has an answer here:

• How do I generate a random int number in C#? 21 answers

I've tried everything from youtube videos to this forum. Used to always find a solution here but now I'm stuck. Need to generate a random number between 39 & 52. Here's the somewhat source

case Form1.number.WITHRANDOM:
            {
                int i = 0;
                while (i < ammount)
                {
                    i++;
                    int j = 0;
                    string text2 = "";
                    while (j < 2)
                    {
                        string value = Conversions.ToString(this.random.Next(0, text.Length));
                        text2 += Conversions.ToString(text[Conversions.ToInteger(value)]);
                        j++;
                    }
                    this.numberList.Add("173"+ (The random number) + text2);
                }
                break;
            }