List with ForEach

List Names = new List();
Names.Add("Saurabh");
Names.Add("Somu");
Names.Add("Sandy");

//For every item in the list, say you want to append the last name "Somu" and print it

//WITHOUT ForEach()
foreach (string name in Names)
{
Console.WriteLine(name + " Somu");
}

//WITH ForEach
Names.ForEach(delegate(string name) { Console.WriteLine( name + " Somu" ); });

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Yield Keyword

class Program
{
static void Main(string[] args)
{
List Names = new List();
Names.Add("saurabh");
Names.Add("somu");
Names.Add("vivek");

foreach (string item in GetNames(Names))
{
Console.WriteLine(item);
}
}

public static IEnumerable GetNames(List Names)
{
for (int i = 0; i < Names.Count; i++)
{
yield return Names[i];
}
}
}

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?? keyword

?? keyword is used to check null.

Example using if-else statement:-
if (tempString == null)
{
x = "Null string";
}
else
{
x = tempString ;
}
Console.WriteLine(x);

Example using ?? Keyword

string tempString = null;
string x = tempString ?? "Null string";
Console.WriteLine(x); //Prints "Null string"

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