I have a problem when summing all of bx3.text to t2.text. first I split bx3.text with space

    private void total()
    {
        string[] ps = bx3.Text.Split(new string[] {" "}, StringSplitOptions.None );
        t2.Text = ps.Select(x => Convert.ToInt32(x)).Sum().ToString();
    }

I did try with t2.text = ps[1] and the number showed was correct. but when i try to sum it all, I got error

"Input string was not in a correct format" on (x => Convert.ToInt32(x))

bx3.text is full of user-input number separated by single space " "