Save all files in Visual Studio project as UTF-8

This may be of some help.

link removed due to original reference being defaced by spam site.

Short version: edit one file, select File -> Advanced Save Options. Instead of changing UTF-8 to Ascii, change it to UTF-8. Edit: Make sure you select the option that says no byte-order-marker (BOM)

Set code page & hit ok. It seems to persist just past the current file.

Since you're already in Visual Studio, why not just simply write the code?

foreach (var f in new DirectoryInfo(@"...").GetFiles("*.cs", SearchOption.AllDirectories)) {
  string s = File.ReadAllText(f.FullName);
  File.WriteAllText (f.FullName, s, Encoding.UTF8);
}

Only three lines of code! I'm sure you can write this in less than a minute :-)