C#

public Enumerator GetEnumerator()
{
    return new Enumerator((List<T>) this);
}

IEnumerator<MyFoo> myFooEnumerator = myFooCollection.GetEnumerator();
while (myFooEnumerator.MoveNext())
    yield return myFooEnumerator.Current;
IEnumerator<MyBar> myBarEnumerator = myBarCollection.GetEnumerator();
while (myBarEnumerator.MoveNext())
    yield return myBarEnumerator.Current;

private abstract class C
{
    public static readonly List<A> alist = new List<A>();
    public static readonly List<B> blist = new List<B>();
    public static readonly List<C> clist = new List<C>();

    public string Name { get; private set; }

    public C(string Name)
    {
        this.Name = Name;

        clist.Add(this);

        if(this is A)
        {
            alist.Add(this as A);
        }
        else
        {
            blist.Add(this as B);
        }
    }

    public override string ToString() { return (this.Name); }
}

A myA1 = new A("a1");
A myA2 = new A("a2");
B myB1 = new B("b1");
B myB2 = new B("b2");

foreach (var a in C.alist)
{
    Console.WriteLine("This A's Name is : " + a.Name);
}

foreach (var b in C.blist)
{
    Console.WriteLine("This B's Name is : " + b.Name);
}

foreach (var c in C.clist)
{
    Console.WriteLine("This C is a Type: " + c.GetType() + " : Name = " + c.Name);
}

This A's Name is : a1
This A's Name is : a2
This B's Name is : b1
This B's Name is : b2
This C is a Type: TestImmutable.Form1+A : Name = a1
This C is a Type: TestImmutable.Form1+A : Name = a2
This C is a Type: TestImmutable.Form1+B : Name = b1
This C is a Type: TestImmutable.Form1+B : Name = b2

DataColumn myDataColumn;
myDataColumn = new DataColumn();
myDataColumn.DataType = System.Type.GetType("System.Int32");
myDataColumn.ColumnName = "id";
myDataColumn.ReadOnly = true;
myDataColumn.Unique = true;

myDataTable.Columns.Add(myDataColumn);

Brian Reiber wrote:

input = Console.ReadLine();
LastName = Convert.ToString(input);

public static string ToString(string value)
{
    return value;
}

Brian Reiber wrote:

stringinput

Brian Reiber wrote:

input = Console.ReadLine();
FirstName = Convert.ToString(input);

Brian Reiber wrote:

Convert

Brian Reiber wrote:

{1} ... , payRate[x].ToString("C")

Deborah Palmer McCain wrote:

I don't do well with books I cannot markup with pencil notations.

private static readonly double[] PayRate =
    new double[4] {
        3.00,
        4.15,
        6.42,
        7.95 };

static void Main()
{
    Console.WriteLine("Enter your forename:");
    string forename = Console.ReadLine();
    Console.WriteLine("Enter your surname:");
    string surname = Console.ReadLine();
    Checkout();
    Console.ReadKey();
}

private static void Checkout()
{
    Console.WriteLine("You are ready to check out.");
    for (int i = 0; i < PayRate.Length; i++)
        Console.WriteLine("Pay rate {0} is {1:C}", i, PayRate[i]);
}

const int MAX_BOOK = 5;
public static void personalDetails()
{
    string[,] books = {
        { "The Time Machine, Science Fiction, By H.G.Wells", "3" },
        { "Ender's Game, Science Fiction, By Orson Scott Card", "1" } };

    int book = 0;
    if (book >= MAX_BOOK)
        Console.WriteLine("You are at your limit!");
}

string [,] books = {

{"The Time Machine, Science Fiction, By H.G.Wells","3"}, // Note the comman, and not a semi-colon

{"The Da Vinci Code, Mystery, By Dan Brown","2"}};

int book;

const int MAX_BOOK = 5;

Console.WriteLine("You are at your limit!");

Pete O'Hanlon wrote:

you declare book but you don't set it to a value so it will never trigger the WriteLine condition because an int defaults to 0.