What are the Using Statements For?

using System;                                //basic tools for controls, variables, event handlers, much more!

using System.Collections.Generic;      // Adds collections/arrays

using System.ComponentModel;        //manages/implements how controls work

using System.Data;                        //file I/O

using System.Drawing;                    //Graphical Design Interface GDI+:two-dimensional vector graphics/imaging.

using System.Text;                        //ASCII & unicode characters (American Standards Committee for Information Interchange)

using System.Windows.Forms;         //Ability to make windows apps with all the controls/features

namespace WindowsApplication1

    public partial class Form1 : Form

public Form1()                            //this method is made for us and calls the InitializeComponent method. See Form1.Designer.CS

{

InitializeComponent();

}

This method is in the Form1.Designer.CS file. This is where our controls are created! VS builds all this for us.

private void InitializeComponent()

{

this.textBox1 = new System.Windows.Forms.TextBox();

this.textBox2 = new System.Windows.Forms.TextBox();

this.btnOK = new System.Windows.Forms.Button();

this.btnClear = new System.Windows.Forms.Button();

this.btnExit = new System.Windows.Forms.Button();

this.label1 = new System.Windows.Forms.Label();

this.SuspendLayout();

//

// textBox1

//

this.textBox1.Location = new System.Drawing.Point(53, 56);

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(100, 20);

this.textBox1.TabIndex = 0;

//

// textBox2

//

this.textBox2.Location = new System.Drawing.Point(53, 97);

this.textBox2.Name = "textBox2";

this.textBox2.Size = new System.Drawing.Size(100, 20);

this.textBox2.TabIndex = 1;

//

// btnOK

//

this.btnOK.Location = new System.Drawing.Point(205, 56);

this.btnOK.Name = "btnOK";

this.btnOK.Size = new System.Drawing.Size(75, 23);

this.btnOK.TabIndex = 2;

this.btnOK.Text = "OK";

this.btnOK.UseVisualStyleBackColor = true;

this.btnOK.Click += new System.EventHandler(this.btnOK_Click);

//

// btnClear

//

this.btnClear.Location = new System.Drawing.Point(205, 93);

this.btnClear.Name = "btnClear";

this.btnClear.Size = new System.Drawing.Size(75, 23);

this.btnClear.TabIndex = 3;

this.btnClear.Text = "Clear";

this.btnClear.UseVisualStyleBackColor = true;

this.btnClear.Click += new System.EventHandler(this.btnClear_Click);

//