.net NotSupportedException while creating file with date

Question

I want to create a file with date.

DateTime time_now = DateTime::UtcNow;
String^  time_str = time_now.UtcNow.ToString();
String^  strPath = "C:\\Users\\Documents\\VS\\MyProject\\" + fileName + time_str + ".prc";

FileStream^  fs = File::Create(strPath); // in this line I get notSupportedException

I debug the code and the file name is : myfile05.01.2012 12:37:1222.prc

I think the probles is ":" How can I fix it?

Answer 1

Personally I would replace the "." and ":" with "_" ;

strPath.Replace(".","_").Replace(":","_");

Answer 2

Replace every invalid character with an underscore:

private string GetValidPath(string _Path)
        {
            String goodPath = _Path;
            foreach (char letter in System.IO.Path.GetInvalidPathChars())
            {
                goodPath = goodPath.Replace(letter, '_');
            }
            return goodPath;
        }

If you're programming in C++/CLI, you can hopefully port this C# code.