Try this:
var numbers = textBox1.Text.Split(' ');
List<int> lst = numbers.Select(item => int.Parse(item)).ToList();
It will be even better if you use method group like this:
List<int> lst = numbers.Select(int.Parse).ToList();
Then you can get it’s values like this:
lst[0] --> 1
lst[1] --> 32
and ...
0
solved How to set space between TextBox values into array