Digitizer interface in C# using VBTablet

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using VBTablet;

namespace DigitizerInterface
{
    public partial class Form1 : Form
    {
        public  Tablet Digitizer;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {

                // On Error GoTo errorload
                Digitizer = new Tablet(); //Actually create the tablet object
                sldGranularity.Value = 2; //Set packet granularity value
                //that uses a tablet attribute. Remember not everyone has _your_ tablet.
                Digitizer.UnavailableIsError = false;

                //Tablet.hWnd = frmMain.DefInstance.Handle
                prgX.Maximum = Digitizer.Context.OutputExtentX - Digitizer.Context.OutputOriginX;
                prgY.Maximum = Digitizer.Context.OutputExtentY - Digitizer.Context.OutputOriginY;
                prgZ.Maximum = Digitizer.Context.OutputExtentZ - Digitizer.Context.OutputOriginZ;

                prgPressure.Maximum = (int)Digitizer.Device.NormalPressure.get_Max(true);
                prgTangentPressure.Maximum = (int)Digitizer.Device.TangentPressure.get_Max(true);
            }

            catch (Exception  ex)
            {

                MessageBox.Show(ex.Message);
            }
            
            
      }

        private void cmdConnect_Click(object sender, EventArgs e)
        {
            IntPtr Hwnd;
            bool IsDigitizingContext=false;
            string ContextID = "FirstContext";
            Connect.Enabled = false;
            Enable.Enabled = true;
            Hwnd = this.Handle;
            Digitizer.hWnd = Hwnd;
            
            Disconnect.Enabled = true;
            Digitizer.AddContext(ContextID, ref IsDigitizingContext);
            Digitizer.SelectContext(ref ContextID);
            Digitizer.Connected = true;
            Digitizer.Context.QueueSize = 32;//Set queue size to a reasonable value
        }

        private void Enable_Click(object sender, EventArgs e)
        {
            Disable.Enabled = true;
        }

        private void Disconnect_Click(object sender, EventArgs e)
        {
            string RemoveCOntextID = "FirstContext";
            Digitizer.RemoveContext(ref RemoveCOntextID);
            Disable.Enabled = false;
            Enable.Enabled = false;
        }
    }
}