eRKa

public bool IsBelong(Point point, IGeometryObject geoGeometry)
{
	var polygon = ((Polygon) geoGeometry).Coordinates;

	var inPolygon = false;

	var x = point.Coordinates.Latitude;
	var y = point.Coordinates.Longitude;

	var points = polygon[0].Coordinates;

	for (var i = 0; i < points.Count - 1; i++)
	{
		if (((points[i + 1].Longitude > y) != (points[i].Longitude >= y)) 
				&& 
			(x < (points[i].Latitude - points[i + 1].Latitude) * (y - points[i + 1].Longitude) / (points[i].Longitude - points[i + 1].Longitude) + points[i + 1].Latitude))
		{
			inPolygon = !inPolygon;
		}
	}
	return inPolygon;
}

static void Main(string[] args)
{
	var str = "{1|2|4}{1|3|3}{2|2|3}{1|1|3}";
	var number = new [] { "3", "2", "1", "2" };

	var temp = str
		.Trim('{', '}')
		.Split(new []{ "}{" }, StringSplitOptions.None)
		.Select(x => x.Split('|').ToArray())
		.ToArray();

	var result = new StringBuilder();
	for (var i = 0; i < temp.Length; i++)
	{
		var isParse = int.TryParse(number[i], out int index);
		if (isParse)
		{
			result.Append(temp[i][index - 1]);
		}
	}

	Console.WriteLine(result);
	Console.ReadKey();
}

abstract class A
{
	protected string _value;
}

class B : A
{
	// Через общее отнаследованное поле
	public string ValueB { get { return _value; } set { _value = value; } }
}

class C : A
{
	private string _valueC;
	
	public C(string any)
	{ }
	
	// Через конструктор
	public C(string any)
	{
		_valueC = any;
	}
	
	public string ValueC { get { return _value; } set { _value = value; } }
	
	// Через метод
	public void SetMethod(string any)
	{
		_valueC = any
	}
}

var b = new B();
var c = new C();
b.ValueB = "any"; // c.ValueC = "any"
// так же как и
c.ValueC = "any"; // b.ValueB = "any"

b.ValueB = "any";
// Через конструктор
var c = new C(b.ValueB); 
// Через метод
c.SetMethod(b.ValueB);

class SmtpSetting
{
	public string Host {get; set;}
	public string Server {get; set;}
	public string Port {get; set;}
}

var smptSettings = new List<SmptSetting>
{
	new SmptSetting
	{
		Host = "mail.ru",
		Server = "smtp.mail.ru",
		Port = 587
	},
	new SmptSetting
	{
		Host = "yahoo.co",
		Server = "smtp.yahoo.co",
		Port = 465
	},
	...
}

var currentSmtp = smptSettings.FirstOrDefault(x => x.Host == host);
if(currentSmtp != null)
{
	var smtp = new SmtpClient(currentSmtp.Server, currentSmtp.Port);
}