CSHARP

null check syntax c#

//Check if an object is null before calling a function using the ? operator.
//The ? operator is syntactic suger for the if block below:

//Using the ? operator
myObject?.MyFunc();

//Using an if block.
if (myObject != null)
{
  myObject.MyFunc();
}

c# null check

public static int CountNumberOfSInName(string name)
{
  if (name == null)
  {
    throw new ArgumentNullException(nameof(name));
  }

  return name.Count(c => char.ToLower(c).Equals('s'));
}

c# null check

if (name is null)
  {
    throw new ArgumentNullException(nameof(name));
  }