How to insert spaces in string using regular expressions

See more:

C#3.0

C#

Hi,

I have a string that looks like this:
"ThisIsSoCool"

I would like to know how to insert spaces whenever there is an uppercase in the string?

I tried this code but it replaces the uppercases with blanks:

static string returnStringWithSpaces(ref string s)
        {
            System.Text.RegularExpressions.RegexOptions options = new System.Text.RegularExpressions.RegexOptions();
            options |= System.Text.RegularExpressions.RegexOptions.None;
            s = System.Text.RegularExpressions.Regex.Replace(s, "[A-Z]", " ", options);
            return s;
        }

Please advise

Thank you