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//******************************************************************************  
//*   Using variables                                    *
//* From video lesson 4 by Bob Tabor                               *
//* @ http://download.microsoft.com/download/6/2/4/6247616D-A0C7-4552-B622-3F0450DE2462/04CSharp.wmv *
//* Some of my own tests and comments were added.                         *
//* These are mostly examples and each block is commented out like this /*...*/.               *
//* To run them simply uncomment the block desired.                         *
//******************************************************************************************
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//* Create a form with two text boxes, a label and a button to use this code in .NET 2.0 Framework with Visual C#.
namespace lesson04
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }
  private void button1_Click(object sender, EventArgs e)
  {
   /*(remove)
   //Create a string variable.
   string myStringVariable;
   //Assign the string variable a value.
   myStringVariable = "myStringVariable = PI";
   //Display the string.
   MessageBox.Show(myStringVariable);
   (remove)*/
   /*
   //Create another string variable and assign a string.
   string myOtherStringVariable = "PI =";
   //Display the string.
   MessageBox.Show(myOtherStringVariable);
   */
   /*
   //Create an integer variable with a value.
   int myInteger = 3;
   //Display the value as a string by converting it.
   MessageBox.Show(myInteger.ToString());
   */
   /*
   //Create a double variable(integer and decimal) with a value.
   double myDouble = 3.14;
   //Display the value as a string by converting it.
   MessageBox.Show(myDouble.ToString());
   */
   /*
   //Create a string variable using an object value and converting
   //to a string.
   string myMathPI = Math.PI.ToString();
   //Display the object value.
   MessageBox.Show(myMathPI);
   */
   
   /*
   //Create a Boolean variable and assign it a value.
   bool myBoolean = true;
   //Display the Boolean value as a string. 
   MessageBox.Show(myBoolean.ToString());
   */
   
   /*
   //Create a string variable from another string variable.
   string myConverted = myMathPI;
   //Display the string.
   MessageBox.Show(myConverted);
   */
   
   /*
   //Create a string variable.
   string hello;
   //Assign it a string.
   hello = "Hello World";
   //Display the string.
   MessageBox.Show(hello);
   */
    
   /*
   //Display a string literal.
   MessageBox.Show("hello world");
   */
   /*
   //Putting two strings together.
   string firstTextBox = textBox1.Text;
   string secondTextBox = textBox2.Text;
   label1.Text = firstTextBox + " " + secondTextBox;
   */
   /*
   //What happens when using wrong variable types.
   int myVariable = "some string";
    
   string myvariable = 3;
   */
   /*
   //This works
   int myValue = 3;
   double myOtherValue;
   myOtherValue = myValue;
   */
   /*
   //But will this?
   int myValue;
   double myOtherValue = 3.14;
   myValue = myOtherValue;
   */
   /*
   //Will this work?
   int firstTextBox = 0;
   int secondTextBox = 0;
   int result = 0;
   firstTextBox = textBox1.Text;
   secondTextBox = textBox2.Text;
   result = firstTextBox + secondTextBox;
   label1.Text = result;
   */
   /*
   //Be carefull and enter only integer values or
   //see what happens.
   int firstTextBox = 0;
   int secondTextBox = 0;
   int result = 0;
   firstTextBox = int.Parse(textBox1.Text);
   secondTextBox = int.Parse(textBox2.Text);
   result = firstTextBox + secondTextBox;
   label1.Text = result.ToString();
   */
   /*
   //will this work?
   int x;
   x + 3;
   */
   /*
   //will this work?
   int x;
   x = x + 3;
   */
   //Be sure to check out
   //http://go.microsoft.com/fwlink/?linkid=45191&clcid=409
   //and if you cannot parse xml then go to this link
   //http://msdn.microsoft.com/vstudio/express/visualcsharp/learning/
   //The new Interenet Explorer 7.0 is out of beta and it will parse xml.
   //@ http://windowsupdate.microsoft.com/
  }
 }
}