Generate Unique Number In C#

This program generates Unique Random Numbers and displays them on the console.

Editor Used

Antechinus, http://www.c-point.com.

Debugger

 

dbgurt.exe

Thanks Saurabh for help and guidance and thanks Mahesh for loading my tutorial. And of course thanks to you for reading it  -- you know who you are!

class testrandom {
    publicstaticvoid Main(string[] args) {
        int intno;
        if (args.Length == 0) {
            Console.WriteLine("Please enter a parameter eg. unique 5");
            return;
        } else {
            intno = Int32.Parse(args[0]);
            if (intno < 1) {
                // Check to see if user has entered value >= 1 because my LowerBound is hardcoded to 1
                Console.WriteLine("Enter value greater than or equal to 1");
                return;
            }
        }
        unique_random generateit = new unique_random();
        generateit.create_random(intno);
    }
}
class unique_random {
    publicvoid create_random(int passed_intno) {
        // Remember: C# Requires all variables Initialized.... so lets initialize variable used
        int LowerBound = 1;
        int UpperBound = passed_intno;
        bool firsttime = true;
        int starti = 0;
        int[] vararray;
        vararray = newint[UpperBound];
        // Random Class used here
        Random randomGenerator = new Random(DateTime.Now.Millisecond);
        do {
            int nogenerated = randomGenerator.Next(LowerBound, UpperBound + 1);
            // Note: randomGenerator.Next generates no. to UpperBound - 1 hence +1
            // .... i got stuck at this pt & had to use the debugger.
            if (firsttime) // if (firsttime == true)
            {
                vararray[starti] = nogenerated; // we simply store the nogenerated in vararray
                firsttime = false;
                starti++;
            } else // if (firsttime == false)
            {
                bool duplicate_flag = CheckDuplicate(nogenerated, starti, vararray); // call to check in array
                if (!duplicate_flag) // duplicate_flag == false
                {
                    vararray[starti] = nogenerated;
                    starti++;
                }
            }
        }
        while (starti < UpperBound);
        PrintArray(vararray); // Print the array
    }
    publicbool CheckDuplicate(int newrandomNum, int loopcount, int[] function_array) {
        bool temp_duplicate = false;
        for (int j = 0; j < loopcount; j++) {
            if (function_array[j] == newrandomNum) {
                temp_duplicate = true;
                break;
            }
        }
        return temp_duplicate;
    }
    // Print Array
    publicstaticvoid PrintArray(Array arr) {
        Console.Write("{");
        int count = 0;
        int li = arr.Length;
        foreach(object o in arr) {
            Console.Write("{0}", o);
            count++;
            //Condition to check whether ',' should be added in printing arrray
            if (count < li) Console.Write(", ");
        }
        Console.WriteLine("}");
    }
}