form1.cs

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

namespace myListBox
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.ToolBar toolBar1;
        private System.Windows.Forms.ToolBarButton toolBarButton1;
        private System.Windows.Forms.ToolBarButton toolBarButton2;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

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

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <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()
		{
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.toolBar1 = new System.Windows.Forms.ToolBar();
            this.toolBarButton1 = new System.Windows.Forms.ToolBarButton();
            this.toolBarButton2 = new System.Windows.Forms.ToolBarButton();
            this.SuspendLayout();
            // 
            // listBox1
            // 
            this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.listBox1.ItemHeight = 12;
            this.listBox1.Location = new System.Drawing.Point(0, 112);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(470, 256);
            this.listBox1.TabIndex = 0;
            // 
            // toolBar1
            // 
            this.toolBar1.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {
                                                                                        this.toolBarButton1,
                                                                                        this.toolBarButton2});
            this.toolBar1.DropDownArrows = true;
            this.toolBar1.Name = "toolBar1";
            this.toolBar1.ShowToolTips = true;
            this.toolBar1.Size = new System.Drawing.Size(472, 38);
            this.toolBar1.TabIndex = 1;
            // 
            // toolBarButton1
            // 
            this.toolBarButton1.Text = "toolBarButton1";
            // 
            // toolBarButton2
            // 
            this.toolBarButton2.Text = "toolBarButton2";
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(472, 365);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.toolBar1,
                                                                          this.listBox1});
            this.Name = "Form1";
            this.Text = "Form1";
            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.Run(new Form1());
		}

        private void Form1_Load(object sender, System.EventArgs e)
        {
            string str = "First item";
            int i = 23;
            float flt = 34.98f; 
            listBox1.Items.Add(str);
            listBox1.Items.Add(i.ToString());
            listBox1.Items.Add(flt.ToString());
            listBox1.Items.Add("Last Item in the List Box");
        }
	}
}