public static string GetUniqueFileName(string directory, string filename, out string filepath)
{
using (var crypto = new Cryptographer())
{
bool unique = false;
string origFilename = filename;
do
{
filename = string.Format("{0}-{1}", crypto.CreateUniqueKey(4), filename);
filepath = Path.Combine(directory, filename);
if (!File.Exists(filepath))
{
unique = true;
}
} while (!unique);
return(filename);
}
}