.NET Fiddle

CSharp · Console

/Program.cs

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine(Math.Round(1.4));  // 1
			Console.WriteLine(Math.Round(1.5));  // 2
			Console.WriteLine(Math.Round(2.5));  // 2  ❗ (not 3) in Modern .NET
			Console.WriteLine(Math.Round(3.5));  // 4
	}
}