C#

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

namespace TestControlLibrary
{
	[Serializable]
	public partial class TestControl : UserControl
	{
		private Vector vector;

		public TestControl()
		{
			InitializeComponent();

			this.vector = new Vector(10, 10, 10);
			this.RefreshVectorDisplay();
		}

		private void RefreshVectorDisplay()
		{
			this.txtX.Text = this.vector.X.ToString();
			this.txtY.Text = this.vector.Y.ToString();
			this.txtZ.Text = this.vector.Z.ToString();
		}

		public Vector Vector
		{
			get
			{
				return this.vector;
			}

			set
			{
				if (this.vector != value)
				{
					this.vector = value;
					this.RefreshVectorDisplay();
				}
			}
		}
	}
}

namespace TestControlLibrary
{
	partial class TestControl
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components = null;

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
		protected override void Dispose(bool disposing)
		{
			if (disposing && (components != null))
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		#region Component Designer generated code

		/// <summary>
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.txtX = new System.Windows.Forms.TextBox();
			this.txtY = new System.Windows.Forms.TextBox();
			this.txtZ = new System.Windows.Forms.TextBox();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.label4 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// txtX
			// 
			this.txtX.Location = new System.Drawing.Point(35, 30);
			this.txtX.Name = "txtX";
			this.txtX.Size = new System.Drawing.Size(100, 20);
			this.txtX.TabIndex = 0;
			// 
			// txtY
			// 
			this.txtY.Location = new System.Drawing.Point(35, 63);
			this.txtY.Name = "txtY";
			this.txtY.Size = new System.Drawing.Size(100, 20);
			this.txtY.TabIndex = 1;
			// 
			// txtZ
			// 
			this.txtZ.Location = new System.Drawing.Point(35, 96);
			this.txtZ.Name = "txtZ";
			this.txtZ.Size = new System.Drawing.Size(100, 20);
			this.txtZ.TabIndex = 2;
			// 
			// label1
			// 
			this.label1.Anchor = System.Windows.Forms.AnchorStyles.Top;
			this.label1.AutoSize = true;
			this.label1.Location = new System.Drawing.Point(55, 8);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(40, 14);
			this.label1.TabIndex = 3;
			this.label1.Text = "Vector";
			// 
			// label2
			// 
			this.label2.AutoSize = true;
			this.label2.Location = new System.Drawing.Point(14, 33);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(17, 14);
			this.label2.TabIndex = 4;
			this.label2.Text = "X:";
			// 
			// label3
			// 
			this.label3.AutoSize = true;
			this.label3.Location = new System.Drawing.Point(12, 66);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(18, 14);
			this.label3.TabIndex = 5;
			this.label3.Text = "Y:";
			// 
			// label4
			// 
			this.label4.AutoSize = true;
			this.label4.Location = new System.Drawing.Point(12, 99);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(17, 14);
			this.label4.TabIndex = 6;
			this.label4.Text = "Z:";
			// 
			// TestControl
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 14F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.BackColor = System.Drawing.Color.MistyRose;
			this.Controls.Add(this.label4);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.txtZ);
			this.Controls.Add(this.txtY);
			this.Controls.Add(this.txtX);
			this.Name = "TestControl";
			this.ResumeLayout(false);
			this.PerformLayout();

		}

		#endregion

		private System.Windows.Forms.TextBox txtX;
		private System.Windows.Forms.TextBox txtY;
		private System.Windows.Forms.TextBox txtZ;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Label label4;
	}
}

public class Vector : INotifyPropertyChanged
{
  private int _x;
  private int _y;
  private int _z;
  
  public int X
  {
    get
    {
      return _x;
    }
    set
    {
      if (_x != value)
      {
        _x = value;
        Changed("X");
      }
    }
  }

  public int Y
  {
    get
    {
      return _y;
    }
    set
    {
      if (_y != value)
      {
        _y = value;
        Changed("Y");
      }
    }
  }

  public int Z
  {
    get
    {
      return _z;
    }
    set
    {
      if (_z != value)
      {
        _z = value;
        Changed("Z");
      }
    }
  }

  private void Set()
  {
    // Do some set work here... and rely on the property changed event
    // firing so the containing object can respond to items that have changed
    // as a result of the notification.
  }

  #region INotifyPropertyChanged Members
  private PropertyChangedEventHandler _propertyChanged;
  /// <summary>
  /// The event handler for the PropertyChanged event.
  /// </summary>
  public event PropertyChangedEventHandler PropertyChanged
  {
    add
    {
      _propertyChanged += value;
    }
    remove
    {
      _propertyChanged -= value;
    }
  }
  /// <summary>
  /// Called whenever a property changes, this method is invoked.
  /// </summary>
  /// <param name="propertyName">The name of the property that changed.</param>
  protected virtual void Changed(string propertyName)
  {
    Set();

    PropertyChangedEventHandler handler = _propertyChanged;
    if (handler != null)
    {
      handler(this, new PropertyChangedEventArgs(propertyName));
    }
  }
  #endregion
}

rich_wenger wrote:

FileInfo fi = new FileInfo(e.FullPath);
if (fi.Length > 524288000)// 500MB = 524288000