WinForm Show Animated Image

import clr
import os
import tempfile
import threading
clr.AddReference('System')
clr.AddReference('System.Windows.Forms')
clr.AddReference('System.Drawing')

from System import IO
from System.IO import Path, File
from System.Windows.Forms import Application, DockStyle, Form, PictureBox, PictureBoxSizeMode, Timer
from System.Drawing import Image, Bitmap, Rectangle, Size
from time import sleep

pathToFile = 'JC.png'
col = 4
lin = 2

def GetRectangle(img):
    h = img.Height/lin
    w = img.Width/col
    return [w,h]

def CropImage(img, rect):
    bmpCrop = img.Clone(rect,img.PixelFormat)
    return bmpCrop



class MainForm(Form):

    def Draw(self,):
        retan = Rectangle(self.ccol*self.ret[0],self.clin*self.ret[1],self.ret[0],self.ret[1])
        self.ccol+=1
        if self.ccol == col:
            self.ccol = 0
            self.clin+=1
        if self.clin == lin:
            self.clin = 0;
        self.pictureBox.Image = CropImage(self.image,retan)

    def __init__(self):
        Form.__init__(self)
        self.ccol = 0
        self.clin = 0
        self.pictureBox = PictureBox()
        self.image = Image.FromFile(pathToFile)
        self.ret = GetRectangle(self.image)
        retan = Rectangle(0,0,self.ret[0],self.ret[1])
        self.ClientSize = Size(self.ret[0],self.ret[1])

        self.pictureBox.SizeMode = PictureBoxSizeMode.StretchImage
        self.pictureBox.Dock = DockStyle.Fill

        self.timer = Timer()
        self.timer.Interval = 100
        self.timer.Enabled = True
        self.timer.Tick += self.OnTick
        self.timer.Start()

        self.Controls.Add(self.pictureBox)

        self.Show()

    def OnTick(self, sender, event):
        self.Draw()
        self.Refresh()


Application.EnableVisualStyles()
form = MainForm()
Application.Run(form)