Q: How to convert a list into int in c# I have a list of integers and I want to count the length of that list but the value of the list is List. In my code it displays like this: How can i convert it into an int? This is my code: foreach (var item in list_number) { numbers = numbers + 1; } A: Use the .Count() extension method, which will give you the Count of the list: var count = list_number.Count(); A: I believe you mean the Count() method. The foreach loop you have will assign each element to a variable named item, but then it will perform the addition, which is not what you want. foreach (var item in list_number) { numbers = numbers + 1; } would be better as: numbers = list_number.Count(); This will give you the number of elements in the list. EDIT: It looks like you want the size of the list (which is more than just its count), so you can do: int size = list_number.Count; This will get the size of the list into the size variable. A: var size = list_number.Count; Or you could use the List.Count Property A: You can just use a variable for the Count and add 1 to it: int sum = 0; foreach (var item in list_number) { sum++; } Or, better yet, use a LINQ Extension method: int sum = list_number.Count(); The Count method will loop through the List and only count the items in it. The Count property is a convenient way of getting the count without having to loop through the items and add one to a variable. It will do all the incrementing for you. When you're working with lists, there are several different ways of getting the count. Check them out here: How to get the size of a list? The Count property is just syntactic sugar for calling the IList Count property, but you're still adding one to the total.