Forloop and Foreachloop in C#.net

It depends on what you are doing, and what you need. If you are iterating through a collection of items, and do not care about the index values then foreach is more convenient, easier to write and safer: you can't get the number of items wrong. If you need to process every second item in a collection for example, or process them ion the reverse order, then a for loop is the only practical way.

The biggest differences are that a foreach loop processes an instance of each element in a collection in turn, while a for loop can work with any data and is not restricted to collection elements alone. This means that a for loop can modify a collection - which is illegal and will cause an error in a foreach loop.



The for loop executes a statement or a

block of statements repeatedly until a specified expression evaluates to

false.  there is need to specify the loop bounds( minimum or maximum).

int j = 0;

for (int i = 1; i <= 5; i++)
{
j

= j + i ;
}

The foreach statement repeats a group of

embedded statements for each element in an array or an object

collection.you do not need to specify the loop bounds minimum or

maximum.

int j = 0;


int[] tempArr = new int[] { 0, 1, 2, 3, 5, 8,

13 };
foreach (int i in tempArr )
{
j = j + i ;
}