Detecting whitespace in textbox

Question

In a WinForms textbox with multiple whitespaces (e.g. 1 1 A), where, between the 1s, there is whitespace, how could I detect this via the string methods or regex?

Answer 1

int NumberOfWhiteSpaceOccurances(string textFromTextBox){
 char[] textHolder = textFromTextBox.toCharArray();
 int numberOfWhiteSpaceOccurances = 0;
 for(int index= 0; index < textHolder.length; index++){
   if(textHolder[index] == ' ')numberOfWhiteSpaceOccurances++;
 }
 return numberOfWhiteSpaceOccurances;
}