Repeat Cards Showing Up In Game And Win Evaluating Code For Poker Game?

I am working on a poker game and I have the game setup the way I want it in terms of graphics and I have the code programed to deal the cards out exactly how I want them. Granted, the code is very simplistic, but functional for a new programmer like myself. I'm sure there are other more efficient ways to code my game, but I like mine so far because I can at least understand the majority of it. With that being said, here are a few problems and questions that I have.

1. How come when all 12 cards are dealt out I have some cards repeating in the game? For example, I get queen of diamonds in more than one picture box when I only want the card to be dealt once and then removed until the next game.

2. I was hoping to have a button 3 to clear all the boxes, basically resetting the game to the next game. When I hit button 3 it only clears the contents of picturebox 10 and 12.Other notes: I have the deal down the way I want it. It deals the first 10 picture boxes and a second button deals the 11 and 12 picture boxes.

3. I know this is my next step so I want to post it with the code I currently have. I want to start taking my project one step further by evalutating each of the three rows of cards (3 rows of 3 cards each - I'm not worried about the dealers hand (picture box 10, 11, 12 yet). So I want to evaluate a row of pictureboxes against a "pay scale" and display the win in a text box or label next to the 3 card hand. For example, Q of diamonds, Q of Clubs, Q of spades would win 15, etc. ( have a weird feeling I may have to change the names of the cards (I have them named card1, card2, etc. right now) to something that identifies them in order to evaluate the hands.

Here is the code that I currently have. I'm using visual basic.

Public Class Form1
Dim Rndm As New Random
Dim myPB(11) As PictureBox
Dim HiddenCards As New List(Of String)

[code]....