Count odd and even number in single textbox in c#

Question

As you can see the image above, they have random [02 04 01 03 05] numbers. Now if I click the button count it will count how many even number or odd number in textbox.

I have a code but it not working properly.

 private void button2_Click(object sender, EventArgs e)
        {
            int num = ConvertToInt32(textBox1.Text);
            int len_num = textBox1.Text.Length;
            int[] arn = new int[len_num];
            int cEv = 0; 
            int pOd = 0; 
            int s = 0;

            for (int i = len_num - 1; i >= 0; i--)
            { 
                arn[i] = broj % 10; 
                if (arn[i] % 2 == 0)
                { 
                    cEv++; 
                }
                else
                { 
                    if (pOd == 0) pOd++; 
                    pOd *= arn[i]; 
                }
                num /= 10; 
                s += arn[i]; 
            }
           
            txteven.Text = "is: " + Convert.ToString(cEv);
            txtodd.Text = "is: " + Convert.ToString(pOd);
            txtsum.Text = "is: " + Convert.ToString(s);

        }

Answer 1

For example:

int[] numbers = textBox1.Text.Split( new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries ).Select( p => int.Parse( p ) ).ToArray( );
int cEv = numbers.Where( n => ( n % 2 ) == 0 ).Count( );
int cOd = numbers.Where( n => ( n % 2 ) != 0 ).Count( );
int s = numbers.Sum( );

txteven.Text = "is: " + cEv;
txtodd.Text = "is: " + cOd;
txtsum.Text = "is: " + s;

It is possible to detect bad numbers.

Answer 2

In such cases, convert the contents of the text box into an array of strings and then convert it to a number.

private void button2_Click(object sender, EventArgs e)
{
    string[] args = textBox1.Text.Split(
                        new char[] { ' ' }, 
                        StringSplitOptions.RemoveEmptyEntries);
    int cEv = 0;
    int pOd = 0;
    int s = 0;
    for (int i = 0; i < args.Length; i++)
    {
        string str = args[i];
        if (int.TryParse(str, out int tmp))
        {
            if (tmp % 2 == 0)
            {
                cEv++;
            }
            else
            {
                pOd++;
            }
            s += tmp;
        }
        else
        {
            System.Diagnostics.Debug.WriteLine($"Error! {str}");
        }
    }
    txteven.Text = "is: " + Convert.ToString(cEv);
    txtodd.Text = "is: " + Convert.ToString(pOd);
    txtsum.Text = "is: " + Convert.ToString(s);
}