C# coding problem

If all you are trying to do is get the numbers out as discrete items, you can use a regular expression. Here's the code that would do this:

public static Regex regex = new Regex(
      "\\d*",
    RegexOptions.Multiline
    | RegexOptions.Compiled
    );
MatchCollection ms = regex.Matches(InputText);

Well, your code ads it sits now) is not going to work because you're assuming that all numbers are two digits long. Beyond that, there's a better way to determine if ta certain character is a digit

private bool IsNumeric(char value)
{
    int outValue;
    bool isNumeric = Int32.TryParse(value, out outValue);
    return isNumeric;
}

At this point, you could do this:

string numberStr = "";
foreach (char character in code)
{
    if (IsNumeric(character))
    {
        numberStr += character;
    }
}

As for parsing the rest of the string appropriately (to extract numeric values), I'll leave that as an exercise for you.

you can try this:

MatchCollection split = Regex.Matches(code, "[0-9]+");
string[] integers = split.OfType<Match>().Select(a => "INTEGER: " + int.Parse(a.Value)).ToArray();

See code below:

if (code.StartsWith("0") || code.StartsWith("1") ||
    code.StartsWith("2") || code.StartsWith("3") ||
    code.StartsWith("4") || code.StartsWith("5") ||
    code.StartsWith("6") || code.StartsWith("7") ||
    code.StartsWith("8") || code.StartsWith("9") ) //to test if number
{
    sNum = String.Concat(sNum, code.Substring(0, 1)); //gets the first character
    if (!(code[1].Equals("0") || code[1].Equals("1") ||
         code[1].Equals("2") || code[1].Equals("3") ||
         code[1].Equals("4") || code[1].Equals("5") ||
         code[1].Equals("6") || code[1].Equals("7") ||
         code[1].Equals("8") || code[1].Equals("9")))
    {
        richTextbox1.AppendText("INTEGER: "+sNum);
    }
    code = code.Remove(0, 1); //removes the first character
}

If you had thought about it you should have found out. The way you wrote the second if in your snippet it always came out as false.

Regards,
Manfred

On more issue:

Just using explicit call to the (virtual!) method Equals (why? should be comparison operator) shows lack of understanding of object identity and comparison issues.

Starting from this point, the author of the code is just bound to having various mistakes; then number of them is just a matter of temperament. ;)