C# CheckState of a Checkbox

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

namespace EE_Q28963043
{
	public partial class Form1 : Form
	{
		bool isLoading = true;
		bool checkingRow = false;
		bool checkingAll = false;
		readonly List<Person> people = new List<Person>()
		{
			new Person() { ID = 1, FirstName = "John", MiddleName = "Paul", LastName = "Jones", Birthdate = new DateTime(1972, 1, 23) },
			new Person() { ID = 2, FirstName = "Craig", MiddleName = "The", LastName = "List", Birthdate = new DateTime(1994, 3, 18) },
			new Person() { ID = 3, FirstName = "Peter", MiddleName = "James", LastName = "Tyler", Birthdate = new DateTime(1988, 12, 6) },
			new Person() { ID = 4, FirstName = "Mike", MiddleName = "Douglas", LastName = "Beals", Birthdate = new DateTime(1962, 2, 12) },
			new Person() { ID = 5, FirstName = "Seymour", MiddleName = "Anthony", LastName = "Niles", Birthdate = new DateTime(1917, 7, 4) }
		};

		public Form1()
		{
			InitializeComponent();
		}

		private void OnCellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
		{
			if (sender is DataGridView)
			{
				var grid = sender as DataGridView;
				var row = grid.Rows[e.RowIndex];
				var column = grid.Columns[e.ColumnIndex];

				if (column.Equals(grid.Columns["Selector"]))
					row.DefaultCellStyle.BackColor = ((row.Cells[column.Index].Value != null && !row.Cells[column.Index].Value.Equals(DBNull.Value)) ? (bool)row.Cells[column.Index].Value : false) ? Color.Yellow : Color.White;
			}
		}

		private void OnCellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
		{
			if (sender is DataGridView)
			{
				var grid = sender as DataGridView;
				var column = grid.Columns[e.ColumnIndex];

				if (column.Equals(grid.Columns["Selector"]))
					grid.EndEdit();
			}
		}

		private void OnCellValueChanged(object sender, DataGridViewCellEventArgs e)
		{
			checkingRow = true;
			if (sender is DataGridView)
			{
				var grid = sender as DataGridView;
				var row = grid.Rows[e.RowIndex];
				var column = grid.Columns[e.ColumnIndex];

				if (column.Equals(grid.Columns["Selector"]))
					row.Selected = (bool)row.Cells[column.Index].Value;

				if (!checkingAll)
					(grid.Controls.Find("cbSelector", true)[0] as CheckBox).Checked = (grid.Rows.Cast<DataGridViewRow>().Where(r => r.Cells[column.Index].Value != null && !r.Cells[column.Index].Value.Equals(DBNull.Value) && (bool)r.Cells[column.Index].Value).Count() == grid.Rows.Count);

				grid.ClearSelection();
				grid.EndEdit();
			}
			checkingRow = false;
		}

		private void OnCheckedChanged(object sender, EventArgs e)
		{
			checkingAll = true;
			if (sender is CheckBox && !checkingRow)
			{
				var cb = sender as CheckBox;
				foreach (DataGridViewRow row in dgvData.Rows)
				{
					row.Cells["Selector"].Value = cb.Checked;
					row.Selected = cb.Checked;
				}
			}
			checkingAll = false;
		}

		private void OnClick(object sender, EventArgs e)
		{
			if (sender is Button)
			{
				var btn = sender as Button;
				if (btn.Equals(btnClear))
				{
					if (dgvData.DataSource != null && dgvData.DataSource is DataTable)
					{
						var data = (dgvData.DataSource as DataTable).Rows.OfType<DataRow>().Select(row => new Person()
						{
							ID = row.Field<int>("ID"),
							FirstName = row.Field<string>("FirstName"),
							MiddleName = row.Field<string>("MiddleName"),
							LastName = row.Field<string>("LastName"),
							Birthdate = row.Field<DateTime>("Birthdate")
						}).ToList();
						dgvData.DataSource = null;
						data.Clear();
						dgvData.DataSource = data.ConvertToDataTable(true);
						(dgvData.Controls.Find("cbSelector", true)[0] as CheckBox).Checked = false;
					}
				}
				else if (btn.Equals(btnFill))
				{
					if (dgvData.DataSource != null && dgvData.DataSource is DataTable)
					{
						var data = (dgvData.DataSource as DataTable).Rows.OfType<DataRow>().Select(row => new Person()
						{
							ID = row.Field<int>("ID"),
							FirstName = row.Field<string>("FirstName"),
							MiddleName = row.Field<string>("MiddleName"),
							LastName = row.Field<string>("LastName"),
							Birthdate = row.Field<DateTime>("Birthdate")
						}).ToList();
						dgvData.DataSource = null;
						data.AddRange(from i in Enumerable.Range((data.Count > 0) ? data.Last().ID + 1 : 0, 20) select new Person() { ID = i, FirstName = string.Format("FirstName{0}", i), MiddleName = string.Format("MiddleName{0}", i), LastName = string.Format("LastName{0}", i), Birthdate = DateTime.Now.AddYears(-(9 * i)) });
						dgvData.DataSource = data.ConvertToDataTable(true);
					}
				}
				else if (btn.Equals(btnRemove))
				{
					if (dgvData.DataSource != null && dgvData.DataSource is DataTable)
					{
						var data = (dgvData.DataSource as DataTable).Rows.OfType<DataRow>().Select(row => new Person()
						{
							ID = row.Field<int>("ID"),
							FirstName = row.Field<string>("FirstName"),
							MiddleName = row.Field<string>("MiddleName"),
							LastName = row.Field<string>("LastName"),
							Birthdate = row.Field<DateTime>("Birthdate")
						}).ToList();
						Person person = default(Person);
						foreach (DataGridViewRow row in dgvData.Rows.Cast<DataGridViewRow>().Reverse())
						{
							if (row.Cells["Selector"].Value != null && !row.Cells["Selector"].Value.Equals(DBNull.Value)? (bool)row.Cells["Selector"].Value : false)
							{
								person = data.FirstOrDefault(p => p.ID.Equals(row.Cells["ID"].Value));
								if (person != null)
									data.Remove(person);
							}
						}
						dgvData.DataSource = null;
						dgvData.DataSource = data.ConvertToDataTable(true);

						if (dgvData.Rows.Cast<DataGridViewRow>().Count() == 0)
							(dgvData.Controls.Find("cbSelector", true)[0] as CheckBox).Checked = false;
					}
				}
			}
		}

		private void OnColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
		{
			if (sender is DataGridView)
			{
				var grid = sender as DataGridView;
				var newColumn = grid.Columns[e.ColumnIndex];
				var oldColumn = grid.SortedColumn;
				var direction = default(ListSortDirection);

				if (oldColumn != null)
				{
					if (oldColumn.Equals(newColumn) && grid.SortOrder == SortOrder.Descending)
						direction = ListSortDirection.Ascending;
					else
					{
						direction = ListSortDirection.Descending;
						oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None;
					}
				}
				else
					direction = ListSortDirection.Descending;

				grid.Sort(newColumn, direction);
				newColumn.HeaderCell.SortGlyphDirection = (direction == ListSortDirection.Descending) ? SortOrder.Descending : SortOrder.Ascending;
			}
		}

		private void OnDataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
		{
			if (sender is DataGridView)
			{
				var grid = sender as DataGridView;
				if (grid.Rows.Count > 0)
					grid.BeginEdit(true);
				foreach (DataGridViewColumn column in grid.Columns)
				{
					if (column.Name.Equals("Selector"))
					{
						try
						{
							column.Width = 25;
							Rectangle rectangle = grid.GetCellDisplayRectangle(column.Index, -1, true);
							rectangle.X = rectangle.Location.X + (rectangle.Width / 4);
							CheckBox selector = new CheckBox() { Name = "cbSelector", Size = new Size(18, 18), Location = rectangle.Location };
							selector.CheckedChanged += OnCheckedChanged;
							grid.Controls.Add(selector);
						}
						catch (Exception)
						{
							throw;
						}
					}
					column.SortMode = DataGridViewColumnSortMode.Programmatic;
				}

				foreach (DataGridViewRow row in grid.SelectedRows)
					row.Selected = false;
				grid.EndEdit();
			}
		}

		private void OnLoad(object sender, EventArgs e)
		{
			dgvData.DataSource = people.ConvertToDataTable(true);
			isLoading = false;
		}
	}

	class Person
	{
		public int ID { get; set; }
		public string FirstName { get; set; }
		public string MiddleName { get; set; }
		public string LastName { get; set; }
		public DateTime Birthdate { get; set; }
		public string Age { get { return string.Format("{0} Years Old", DateTime.Now.Year - Birthdate.Year); } }

		public override string ToString()
		{
			 return string.Format("{0} {1}. {2} [Age: {3}]", FirstName, MiddleName, LastName, Age);
		}
	}

	static class Extensions
	{
		public static DataTable ConvertToDataTable<T>(this IEnumerable<T> source, bool addSelectorColumn)
		{
			var properties = TypeDescriptor.GetProperties(typeof(T));
			var table = new DataTable();
			var property = default(PropertyDescriptor);

			for (int i = 0; i < properties.Count - 1; i++)
			{
				property = properties[i];
				if (property.PropertyType.IsGenericType && property.PropertyType.GetGenericTypeDefinition().Equals(typeof(Nullable)))
					table.Columns.Add(property.Name, property.PropertyType.GetGenericArguments()[0]);
				else
					table.Columns.Add(property.Name, property.PropertyType);
			}

			object[] values = new object[properties.Count - 1];
			foreach (var item in source)
			{
				for (int i = 0; i < properties.Count - 1; i++)
					values[i] = properties[i].GetValue(item);
				table.Rows.Add(values);
			}

			if (addSelectorColumn)
				table.Columns.Add("Selector", typeof(bool)).SetOrdinal(0);

			return table;
		}
	}
}

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namespace EE_Q28963043
{
	partial class Form1
	{
		/// <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 Windows Form 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.dgvData = new System.Windows.Forms.DataGridView();
			this.btnClear = new System.Windows.Forms.Button();
			this.btnFill = new System.Windows.Forms.Button();
			this.btnRemove = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.dgvData)).BeginInit();
			this.SuspendLayout();
			// 
			// dgvData
			// 
			this.dgvData.AllowUserToAddRows = false;
			this.dgvData.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
			this.dgvData.Location = new System.Drawing.Point(13, 13);
			this.dgvData.Name = "dgvData";
			this.dgvData.RowHeadersVisible = false;
			this.dgvData.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
			this.dgvData.Size = new System.Drawing.Size(444, 208);
			this.dgvData.TabIndex = 0;
			this.dgvData.CellFormatting += new System.Windows.Forms.DataGridViewCellFormattingEventHandler(this.OnCellFormatting);
			this.dgvData.CellMouseUp += new System.Windows.Forms.DataGridViewCellMouseEventHandler(this.OnCellMouseUp);
			this.dgvData.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.OnCellValueChanged);
			this.dgvData.ColumnHeaderMouseClick += new System.Windows.Forms.DataGridViewCellMouseEventHandler(this.OnColumnHeaderMouseClick);
			this.dgvData.DataBindingComplete += new System.Windows.Forms.DataGridViewBindingCompleteEventHandler(this.OnDataBindingComplete);
			// 
			// btnClear
			// 
			this.btnClear.Location = new System.Drawing.Point(382, 227);
			this.btnClear.Name = "btnClear";
			this.btnClear.Size = new System.Drawing.Size(75, 23);
			this.btnClear.TabIndex = 2;
			this.btnClear.Text = "Clear";
			this.btnClear.UseVisualStyleBackColor = true;
			this.btnClear.Click += new System.EventHandler(this.OnClick);
			// 
			// btnFill
			// 
			this.btnFill.Location = new System.Drawing.Point(301, 226);
			this.btnFill.Name = "btnFill";
			this.btnFill.Size = new System.Drawing.Size(75, 23);
			this.btnFill.TabIndex = 1;
			this.btnFill.Text = "Fill";
			this.btnFill.UseVisualStyleBackColor = true;
			this.btnFill.Click += new System.EventHandler(this.OnClick);
			// 
			// btnRemove
			// 
			this.btnRemove.Location = new System.Drawing.Point(13, 226);
			this.btnRemove.Name = "btnRemove";
			this.btnRemove.Size = new System.Drawing.Size(141, 23);
			this.btnRemove.TabIndex = 3;
			this.btnRemove.Text = "Remove Selected";
			this.btnRemove.UseVisualStyleBackColor = true;
			this.btnRemove.Click += new System.EventHandler(this.OnClick);
			// 
			// Form1
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(469, 261);
			this.Controls.Add(this.btnRemove);
			this.Controls.Add(this.btnClear);
			this.Controls.Add(this.btnFill);
			this.Controls.Add(this.dgvData);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.OnLoad);
			((System.ComponentModel.ISupportInitialize)(this.dgvData)).EndInit();
			this.ResumeLayout(false);

		}

		#endregion

		private System.Windows.Forms.DataGridView dgvData;
		private System.Windows.Forms.Button btnClear;
		private System.Windows.Forms.Button btnFill;
		private System.Windows.Forms.Button btnRemove;
	}
}

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