What does char 160 mean in my source code?

Question

I am formatting numbers to string using the following format string \"# #.##\", at some point I need to turn back these number strings like (1 234 567) into something like 1234

Answer 1

This is a fast (and fairly readable) way of removing any characters classified as white space using Char.IsWhiteSpace:

StringBuilder sb = new StringBuilder (value.Length);
foreach (char c in value)
{
    if (!char.IsWhiteSpace (c))
        sb.Append (c);
}
string value= sb.ToString();

As dbemerlin points out, if you know you will only need numbers from your data, you would be better use Char.IsNumber or the even more restrictive Char.IsDigit:

StringBuilder sb = new StringBuilder (value.Length);
foreach (char c in value)
{
    if (char.IsNumber(c))
        sb.Append (c);
}
string value= sb.ToString();

If you need numbers and decimal seperators, something like this should suffice:

StringBuilder sb = new StringBuilder (value.Length);
foreach (char c in value)
{
    if (char.IsNumber(c)|c == System.Globalization.NumberFormatInfo.CurrentInfo.NumberDecimalSeparator )
        sb.Append (c);
}
string value= sb.ToString();