C# 4 and .NET 4

48 ❘ ChaPTer 2 cOre c#
class Test
{
public static int Main()
{
Introduction::NamespaceExample NSEx =
new Introduction::NamespaceExample();
Console.WriteLine(NSEx.GetNamespace());
return 0;
}
}
namespace Wrox.ProCSharp.Basics
{
class NamespaceExample
{
public string GetNamespace()
{
return this.GetType().Namespace;
}
}
}
The main() meThod
As you saw at the start of this chapter, C# programs start execution at a method named Main(). This must
be a static method of a class (or struct), and must have a return type of either int or void.
Although it is common to specify the public modifier explicitly, because by definition the method must be
called from outside the program, it doesn’t actually matter what accessibility level you assign to the entrypoint
method — it will run even if you mark the method as private.
multiple main() methods
When a C# console or Windows application is compiled, by default the compiler looks for exactly one
Main() method in any class matching the signature that was just described and makes that class method
the entry point for the program. If there is more than one Main() method, the compiler will return an error
message. For example, consider the following code called DoubleMain.cs:
using System;
namespace Wrox
{
class Client
{
public static int Main()
{
MathExample.Main();
return 0;
}
}
class MathExample
{
static int Add(int x, int y)
{
return x + y;
}
public static int Main()
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