Parsing from string to int

Question

in my C# project I have an array type of String. the array gets numbers from type int.
int numCell;
string[] arr = new string[numCell];
then i use it in a function like this:
sum += int.Parse(arr[i]);
and it works!
but, when i dothe same thing in WPF it tells me:
Input string was not in a correct format.
what shouuld i do?

Answer 1

Why did you mark your own question as answer? Please unmark it.
>>if in C# it worked why wouldn't it work in wpf?
As I have already mentioned, it is because of the actual value of arr[i]. It has nothing to do with Windows Forms or WPF but it is possible that your WPF application has put a different value in the array than your Windows Forms Application did. And if this
specific value is not a valid number the parsing will always fail. So you should check the values that put into the array and probably use the int.TryParse method to do the parsing:
int sum;
if (!int.TryParse(arr[i], out sum))
//the value of arr[i] was NOT a valid number...
This will however not change the fact that for example the value "D1" cannot be converted to an int using the int.Parse or int.TryParse method.
Please remember to close your threads by marking helpful posts as answer and please start a new thread if you have a new question.