Password generator length of 1 to 999 characters

The program allows you to generate a random sequence of 1 to 999 characters.
Program settings:
- Select the password length;
- The choice of characters that generated the sequence: digits, special characters, Latin or Russian capital letters, Latin or Russian capital letters in any combination;
- Option to generate without repeating characters (optional added as needed in 2009);
There is a button to copy the generated sequence into the buffer.

The program is written by me in C #, designed for himself, repeatedly tested in operation.