Visual Studio and Visual Basic Programming in C#

I am having trouble with these two programs I keep getting this error for both programs and I don't know how to fix it

ERROR Cannot declare namespace in script code

1. Write a console application called DayDreaming that declares a minutes variable to represent time spent daydreaming on the job. Assign a value to that variable in your program then display the value in hours and minutes. (For example, 122 minutes would be displayed as "2 hours and 2 minutes.")

2. Write a console application called ScoreMonger that declares five variables to hold test scores. In your program, assign values to each variable then compute an average of the scores and display the average of the test scores to one (1) decimal place.

 (1)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace DayDreaming

{

    class DayDreaming

    {

        //declaring variables

        private int inputMinutes;

        //a method to process input

        private void processInput(int minutes)

        {

            if (minutes > 60)

            {

                int hours = (minutes-minutes%60) / 60;

                int reminder = (minutes-hours* 60);

                Console.WriteLine(hours + " hours " + reminder + " minutes");

            }

        }

        //the main method

        static void Main(string[] args)

        {

            Console.WriteLine("How many minutes were spent day dreaming? ");

            string input = Console.ReadLine();

            DayDreaming mc = new DayDreaming();

            mc.inputMinutes = Convert.ToInt32(input);

            mc.processInput(mc.inputMinutes);

            Console.ReadKey();

        }

    }

}

(2)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ScoreMonger

{

    class ScoreMonger

    {

        //declare score and average variables

        private int scoreOne;

        private int scoreTwo;

        private int scoreThree;

        private int scoreFour;

        private int scoreFive;

        private double average;

        //a method to compute average score

        private void computeAverageScore()

        {

            double avg = (double) (this.scoreOne + this.scoreTwo + this.scoreThree + this.scoreFour + this.scoreFive) / 5;

            this.average = Math.Round(avg, 1);

        }

        //method to request for scores

        private void requestForScores()

        {

            Console.WriteLine("Enter Score 1: ");

            this.scoreOne = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter Score 2: ");

            this.scoreTwo = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter Score 3: ");

            this.scoreThree = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter Score 4: ");

            this.scoreFour = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter Score 5: ");

            this.scoreFive = Convert.ToInt32(Console.ReadLine());

        }

        //the main method

        static void Main(string[] args)

        {

            ScoreMonger sm = new ScoreMonger();

            sm.requestForScores();

            sm.computeAverageScore();

            Console.WriteLine("The average score is " + sm.average);

            Console.ReadKey();

        }

    }

}