Can someone explain it to me what closure is in real simple language ? [duplicate]

Answer 1

If the 5 year old knew C#, I would explain with this code sample:

int i = 0;
string result = null;
Action iExaminer = () =>
{
  result = i % 2 == 1 ? "Odd" : "Even";
};
i = 1;
iExaminer();
Console.WriteLine(result);

If the 5 year old was learning linq, I would explain with this code sample:

string name = null;
IEnumerable query = Customers.Where(c => c.Name == name);
name = "Bob";
 // query is resolved when enumerated (which is now)
 // Where will now call our anonymous method.
foreach(var customer in query)
{
  Console.WriteLine(customer.Name);
}