Random

I am trying to make a simple dice rolling program that will roll a set amount of dice and set amount of sides, but I can't find an adequate explanation of the use of Random to put the random part in. Can someone help me with this?

using System;


class Roll_The_Dice
{

    static void Main()
    {

       
        int numberInteger, sidesInteger, modifierInteger, rollsInteger;
        string answerString;

        do
        {

            Console.Clear();

            Console.WriteLine();

            Console.WriteLine("*** * Roll the Dice * ***");

            Console.WriteLine();

            Console.Write("Enter Number of Dice : ");

            int.TryParse(Console.ReadLine(), out numberInteger);

            Console.Write("Enter Number of Sides: ");

            int.TryParse(Console.ReadLine(), out sidesInteger);

            Console.WriteLine();

            do //This loop I want to take the above inputs and use them for 1.) sides int for max sides 2.) use the number of dice to continue until out of dice
                //and 3.) add all the rolls together then add the modifier. My friends managed this quite easily in C++.
            {
                Random rollInteger = new Random();

                Console.WriteLine("Your roll is " + rollInteger.Next(1, sidesInteger).ToString() + "!");

                numberInteger = numberInteger - 1;

            } while (numberInteger > 0);

            Console.WriteLine();

            do
            {

                Console.Write("Roll again (Y/N)? ");

                answerString = Console.ReadLine().ToUpper();

            } while (answerString != "Y" && answerString != "N");

        } while (answerString == "Y");

        Console.WriteLine();

        Console.Write("Thanks for rolling with me! Press Enter to exit!");

        Console.WriteLine();

    }


           
} //End Class