Easily Get and Compare OS Version Information

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Diagnostics;

using Common;

namespace OSVersionDemo
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ComboBox _OS1;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.TextBox _Text1;
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.CheckBox _Equals;
		private System.Windows.Forms.CheckBox _NotEquals;
		private System.Windows.Forms.CheckBox _MoreThanOrEqual;
		private System.Windows.Forms.CheckBox _LessThanOrEqual;
		private System.Windows.Forms.CheckBox _LessThan;
		private System.Windows.Forms.CheckBox _MoreThan;
		private System.Windows.Forms.TextBox _Text2;
		private System.Windows.Forms.ComboBox _OS2;

		OperatingSystemVersion _Host = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			try
			{
				_Host = new OperatingSystemVersion();
			}
			catch ( Exception x )
			{
				MessageBox.Show( x.ToString(), "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error );
				Close();
			}
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (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()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
			this._OS1 = new System.Windows.Forms.ComboBox();
			this._Text1 = new System.Windows.Forms.TextBox();
			this.groupBox1 = new System.Windows.Forms.GroupBox();
			this.groupBox2 = new System.Windows.Forms.GroupBox();
			this._Equals = new System.Windows.Forms.CheckBox();
			this._NotEquals = new System.Windows.Forms.CheckBox();
			this._MoreThanOrEqual = new System.Windows.Forms.CheckBox();
			this._LessThanOrEqual = new System.Windows.Forms.CheckBox();
			this._LessThan = new System.Windows.Forms.CheckBox();
			this._MoreThan = new System.Windows.Forms.CheckBox();
			this._Text2 = new System.Windows.Forms.TextBox();
			this._OS2 = new System.Windows.Forms.ComboBox();
			this.SuspendLayout();
			// 
			// _OS1
			// 
			this._OS1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this._OS1.Location = new System.Drawing.Point(8, 8);
			this._OS1.Name = "_OS1";
			this._OS1.Size = new System.Drawing.Size(121, 21);
			this._OS1.TabIndex = 0;
			this._OS1.SelectedIndexChanged += new System.EventHandler(this._OS1_SelectedIndexChanged);
			// 
			// _Text1
			// 
			this._Text1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this._Text1.Location = new System.Drawing.Point(8, 40);
			this._Text1.Name = "_Text1";
			this._Text1.ReadOnly = true;
			this._Text1.Size = new System.Drawing.Size(272, 20);
			this._Text1.TabIndex = 1;
			this._Text1.TabStop = false;
			this._Text1.Text = "";
			// 
			// groupBox1
			// 
			this.groupBox1.Location = new System.Drawing.Point(8, 72);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(272, 8);
			this.groupBox1.TabIndex = 2;
			this.groupBox1.TabStop = false;
			// 
			// groupBox2
			// 
			this.groupBox2.Location = new System.Drawing.Point(8, 136);
			this.groupBox2.Name = "groupBox2";
			this.groupBox2.Size = new System.Drawing.Size(272, 8);
			this.groupBox2.TabIndex = 9;
			this.groupBox2.TabStop = false;
			// 
			// _Equals
			// 
			this._Equals.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._Equals.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._Equals.Location = new System.Drawing.Point(16, 88);
			this._Equals.Name = "_Equals";
			this._Equals.Size = new System.Drawing.Size(48, 24);
			this._Equals.TabIndex = 3;
			this._Equals.TabStop = false;
			this._Equals.Text = "==";
			// 
			// _NotEquals
			// 
			this._NotEquals.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._NotEquals.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._NotEquals.Location = new System.Drawing.Point(16, 112);
			this._NotEquals.Name = "_NotEquals";
			this._NotEquals.Size = new System.Drawing.Size(48, 24);
			this._NotEquals.TabIndex = 4;
			this._NotEquals.TabStop = false;
			this._NotEquals.Text = "!=";
			// 
			// _MoreThanOrEqual
			// 
			this._MoreThanOrEqual.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._MoreThanOrEqual.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._MoreThanOrEqual.Location = new System.Drawing.Point(112, 112);
			this._MoreThanOrEqual.Name = "_MoreThanOrEqual";
			this._MoreThanOrEqual.Size = new System.Drawing.Size(48, 24);
			this._MoreThanOrEqual.TabIndex = 6;
			this._MoreThanOrEqual.TabStop = false;
			this._MoreThanOrEqual.Text = ">=";
			// 
			// _LessThanOrEqual
			// 
			this._LessThanOrEqual.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._LessThanOrEqual.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._LessThanOrEqual.Location = new System.Drawing.Point(112, 88);
			this._LessThanOrEqual.Name = "_LessThanOrEqual";
			this._LessThanOrEqual.Size = new System.Drawing.Size(48, 24);
			this._LessThanOrEqual.TabIndex = 5;
			this._LessThanOrEqual.TabStop = false;
			this._LessThanOrEqual.Text = "<=";
			// 
			// _LessThan
			// 
			this._LessThan.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._LessThan.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._LessThan.Location = new System.Drawing.Point(208, 88);
			this._LessThan.Name = "_LessThan";
			this._LessThan.Size = new System.Drawing.Size(48, 24);
			this._LessThan.TabIndex = 7;
			this._LessThan.TabStop = false;
			this._LessThan.Text = "<";
			// 
			// _MoreThan
			// 
			this._MoreThan.CheckAlign = System.Drawing.ContentAlignment.MiddleRight;
			this._MoreThan.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this._MoreThan.Location = new System.Drawing.Point(208, 112);
			this._MoreThan.Name = "_MoreThan";
			this._MoreThan.Size = new System.Drawing.Size(48, 24);
			this._MoreThan.TabIndex = 8;
			this._MoreThan.TabStop = false;
			this._MoreThan.Text = ">";
			// 
			// _Text2
			// 
			this._Text2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this._Text2.Location = new System.Drawing.Point(8, 192);
			this._Text2.Name = "_Text2";
			this._Text2.ReadOnly = true;
			this._Text2.Size = new System.Drawing.Size(272, 20);
			this._Text2.TabIndex = 11;
			this._Text2.TabStop = false;
			this._Text2.Text = "";
			// 
			// _OS2
			// 
			this._OS2.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this._OS2.Location = new System.Drawing.Point(8, 160);
			this._OS2.Name = "_OS2";
			this._OS2.Size = new System.Drawing.Size(121, 21);
			this._OS2.TabIndex = 10;
			this._OS2.SelectedIndexChanged += new System.EventHandler(this._OS2_SelectedIndexChanged);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 222);
			this.Controls.Add(this._Equals);
			this.Controls.Add(this.groupBox1);
			this.Controls.Add(this._Text1);
			this.Controls.Add(this._OS1);
			this.Controls.Add(this.groupBox2);
			this.Controls.Add(this._NotEquals);
			this.Controls.Add(this._MoreThanOrEqual);
			this.Controls.Add(this._LessThanOrEqual);
			this.Controls.Add(this._LessThan);
			this.Controls.Add(this._MoreThan);
			this.Controls.Add(this._Text2);
			this.Controls.Add(this._OS2);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
			this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "OSVersionDemo";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.EnableVisualStyles();
			Application.DoEvents();

			Application.Run( new Form1() );
		}

		private void Form1_Load( object sender, System.EventArgs e )
		{
			Populate( _OS1 );
			Populate( _OS2 );

			_OS1.SelectedIndex = 0;
			_OS2.SelectedIndex = 0;
		}

		private void Populate( ComboBox cb )
		{
			ArrayList a = new ArrayList();

			cb.Items.Add( "This host" );

			foreach ( OSVersion v in Enum.GetValues( typeof( OSVersion ) ) )
//				cb.Items.Add( new CBData( Enum.GetName( typeof( OSVersion), v ), v ) );
				cb.Items.Add( v );
		}

		private void _OS1_SelectedIndexChanged( object sender, System.EventArgs e )
		{
			_Text1.Text = String.Empty;

			object o = _OS1.SelectedItem;
			if ( o == null ) return;

			OSVersionInfo v = GetOSVersionInfo( o );
			_Text1.Text = v.ToString();

			Compare();
		}

		private void _OS2_SelectedIndexChanged( object sender, System.EventArgs e )
		{
			_Text2.Text = String.Empty;

			object o = _OS2.SelectedItem;
			if ( o == null ) return;

			OSVersionInfo v = GetOSVersionInfo( o );
			_Text2.Text = v.ToString();

			Compare();
		}

		private OSVersionInfo GetOSVersionInfo( object o )
		{
			if ( o is string ) return _Host;

			OSVersion v = ( OSVersion ) o;

			return OSVersionInfo.GetOSVersionInfo( v );
		}

		private void Compare()
		{
			object o1 = _OS1.SelectedItem;
			object o2 = _OS2.SelectedItem;

			if ( o1 == null || o2 == null ) return;

			OSVersionInfo v1 = GetOSVersionInfo( o1 );
			OSVersionInfo v2 = GetOSVersionInfo( o2 );

			_Equals.Checked          = ( v1 == v2 );
			_NotEquals.Checked       = ( v1 != v2 );
			_LessThanOrEqual.Checked = ( v1 <= v2 );
			_MoreThanOrEqual.Checked = ( v1 >= v2 );
			_LessThan.Checked        = ( v1 <  v2 );
			_MoreThan.Checked        = ( v1 >  v2 );
		}
	}
}