in C# i need to  Create a program named PaintingDemo that instantiates an array of eight Room objects and demonstrates the Room methods. The Room constructor requires parameters for length, width, and height fields (all of type int); use a variety of values when constructing the objects. The Room class also contains the following fields: Area - The wall area of the Room (as an int) Gallons - The number of gallons of paint needed to paint the room (as an int) Both of these values are computed by calling private methods. Include read-only properties to get a Room’s values. A room is assumed to have four walls, and you do not need to allow for windows and doors, and you do not need to allow for painting the ceiling. A room requires one gallon of paint for every 350 square feet (plus an extra gallon for any square feet greater than 350). In other words, a 12 x 3 x 10 room with 9-foot ceilings has 396 square feet of wall space, and so requires two gallons of paint. the errors are  Room class defined and returns its area 0 out of 1 checks passed. Compilation failed: 6 error(s), 0 warnings NtTestd1b16202.cs(12,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference?  NtTestd1b16202.cs(13,26): error CS0841: A local variable `room1' cannot be used before it is declared NtTestd1b16202.cs(15,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference? NtTestd1b16202.cs(16,26): error CS0841: A local variable `room2' cannot be used before it is declared NtTestd1b16202.cs(18,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference? NtTestd1b16202.cs(19,26): error CS0841: A local variable `room3' cannot be used before it is declared Test Contents [TestFixture] public class RoomClassTest { [Test] public void RoomTest() { Room room1 = new Room(8,8,8); Assert.AreEqual(256, room1.Area); Room room2 = new Room(18,13,10); Assert.AreEqual(620, room2.Area); Room room3 = new Room(22,15,11); Assert.AreEqual(814, room3.Area); } } The Room class calculates and returns the number of gallons required to paint the room 0 out of 1 checks passed.  Unit TestIncomplete The Room class can be initialized and returns the required number of gallons to paint the room Build Status Build Failed   Build Output   Compilation failed: 6 error(s), 0 warnings NtTest667e54f5.cs(12,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference? NtTest667e54f5.cs(13,24): error CS0841: A local variable `room1' cannot be used before it is declared NtTest667e54f5.cs(15,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference? NtTest667e54f5.cs(16,24): error CS0841: A local variable `room2' cannot be used before it is declared NtTest667e54f5.cs(18,5): error CS0246: The type or namespace name `Room' could not be found. Are you missing an assembly reference? NtTest667e54f5.cs(19,24): error CS0841: A local variable `room3' cannot be used before it is declared   Test Contents [TestFixture] public class RoomClassTest { [Test] public void RoomTest() { Room room1 = new Room(8,8,8); Assert.AreEqual(1, room1.Gallons); Room room2 = new Room(18,13,10); Assert.AreEqual(2, room2.Gallons); Room room3 = new Room(22,15,11); Assert.AreEqual(3, room3.Gallons); } } my code so far is  using static System.Console; class PaintintDemo {    static void Main()    {       // Write your main here    } }