Error with IndexOf C#

I'm obviously missing something here.. I'm writing a function that returns the number of substrings delimited by a particular string. Here is the rather simple function - ``` public static FuncError DCount(String v1, String v2, ref Int32 result) { result = 0; if (String.IsNullOrEmpty(v1)) { return null; } if (String.IsNullOrEmpty(v2)) { return null; } int ct = 1; int ix = 0; int nix = 0; do { nix = v1.IndexOf(v2, ix); if (nix >= 0) { ct++; System.Diagnostics.Debug.Print( string.Format("{0} found at {1} count={2} result = {3}", v2, nix, ct, v1.Substring(nix,1))); ix = nix + v2.Length; } } while (nix >= 0); result = ct; return null; } ``` The problem comes when I call with a special character that is being used as a separator in a particular situation. It's returning lots of false positives. From the Debug.Print the first and the last argument should always be the same. ``` þ found at 105 count=2 result = t þ found at 136 count=3 result = t þ found at 152 count=4 result = þ þ found at 249 count=5 result = t þ found at 265 count=6 result = t þ found at 287 count=7 result = t þ found at 317 count=8 result = t þ found at 333 count=9 result = þ þ found at 443 count=10 result = þ þ found at 553 count=11 result = þ þ found at 663 count=12 result = þ þ found at 773 count=13 result = þ þ found at 883 count=14 result = þ þ found at 993 count=15 result = þ ``` If I pass the þ as a char it works fine. If I split the string using þ as a delimiter it returns the correct number of elements. As for the incorrectly identified 't', there are other 't's in the results that are not being picked up, so it's not a character conversion issue. Confused ... Thanks