int i = 0; bool ValueIsNumeric = int::TryParse(MyStringValue, i);
For larger values:
UInt64 i = 0; ValueIsNumeric = UInt64::TryParse(MyStringValue, i);
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.