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int a = 5;
var b = (object)a;

var rnd = new Random();
var arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ];
for(var i; i < arr.Length; i++)
{
	var newPosition = rnd.Next(arr.Length);
	var temp = arr[newPosition];
	arr[newPosition] = arr[i];
	arr[i] = temp;
}

var get_like = db.Like.Where(t => t.Text == 'mytext' && t.Two == 'd').Count();
или
var get_like = db.Like.Count(t => t.Text == 'mytext' && t.Two == 'd');

public class Singleton<T> where T : class
{
	private static readonly Lazy<T> _instance = new Lazy<T>(() => (T)typeof(T).GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, new Type[0], null).Invoke(null), true);

	public static T Instance => _instance.Value;
}

public sealed class CustomSingleton : Singleton<CustomSingleton>
{
}

var single = CustomSingleton.Instance

public class Pixel
{
	public int X {get;set}
	public int Y {get;set}
	public string Text {get;set}	
}

public class LPixels
{
	public List<Pixel> ListPixels = new List<Pixel>();
  
	public Pixel this[int x, int y]
	{
		get
		{
			return ListPixels.FirstOrDefault(px => px.X == x && px.Y == y);
		}
		set
		{
			var point = ListPixels.FirstOrDefault(px => px.X == x && px.Y == y);
			if(point != null)
			{
				point.Text = value.Text;
			}
			else
			{
				var newPoint = new Point
				{
					X = x;
					Y = y;
					Text = value.Text;
				}
				
				ListPixels.Add(newPoint);
			}			
		}
	}
}

var lpixels = new LPixels();
var result = lpixels[1, 2];
lpixels[1, 2] = new Point { Text = "Test" };