Question

I have got column in db which saves the string as 1,2,3,4,5
I want to separate the string to 1 2 3 4 5 and save each number in the array , for instance the array should be like int [] numbers , int[0] = 1 , int[1] = 2 ……

Answer 1

Looks like you want:

int[] array = text.Split(',')
                  .Select(x => int.Parse(x, CultureInfo.InvariantCulture))
                  .ToArray();

Obviously this will go bang if any of the split results is not a parsable integer.

(You may also want to use a List<int> instead of an array, as a generally more flexible collection type.)

EDIT: Short but complete demo program:

using System;
using System.Globalization;
using System.Linq;

public class Test
{
    static void Main()
    {
        string eventIds = "1,2,3";
        int[] array =
            eventIds.Split(',')
                    .Select(x => int.Parse(x, CultureInfo.InvariantCulture))
                    .ToArray();
        foreach (int id in array)
        {
            Console.WriteLine(id);
        }
    }
}