I had an interesting time fixing a bug in PainlessSVN when using UNC paths. I had a function in SVNManagerLib that converted the path to the file:/// format. This is what the original looked like: 

public static string PathToFileUrl( string pathToConvert )

{

     string parsedDir = "";

     StringBuilder arg = new StringBuilder();

     parsedDir = pathToConvert.Replace("\\", "/");

     arg.Append("file:///");

     arg.Append((char)34);

     arg.Append(parsedDir);

     arg.Append((char)34);

     return arg.ToString();

}

That didn't quite work. I did some Googling and found the answer. Let me post the code first then, I'll explain:

public static string PathToFileUrl( string pathToConvert )

{

    UriBuilder fileURL = new UriBuilder( pathToConvert );

    return fileURL.ToString();

}

The UriBuilder is a special class that helps build valid URIs. I keep learning this lesson over and over... Don't re-invent the wheel, just use what the .NET framework already has. There's quite a bit in there. I've been using .NET since 2002, and I keep finding these little nuggets.