private string GenerateLetters(int length, ref int seed)
{
int charStart = EnvironmentVariables.CharacterMap.LettersStartNumber;
int charEnd = charStart + EnvironmentVariables.CharacterMap.LettersLength;
var result = new StringBuilder();
for (int i = 0; i < length; i++)
{
Random rand = GetRandom(ref seed);
result.Append((char)rand.Next(charStart, charEnd));
}
return result.ToString();
}