Dynamic Crystal Reports Viewing

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


namespace prpts
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private CrystalDecisions.Windows.Forms.CrystalReportViewer cRVMain;
		private System.Windows.Forms.ComboBox cBxRptList;
		
		/// <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.cRVMain = new CrystalDecisions.Windows.Forms.CrystalReportViewer();
			this.cBxRptList = new System.Windows.Forms.ComboBox();
			this.SuspendLayout();
			// 
			// cRVMain
			// 
			this.cRVMain.ActiveViewIndex = -1;
			this.cRVMain.Cursor = System.Windows.Forms.Cursors.Hand;
			this.cRVMain.DisplayGroupTree = false;
			this.cRVMain.Dock = System.Windows.Forms.DockStyle.Bottom;
			this.cRVMain.Location = new System.Drawing.Point(0, 28);
			this.cRVMain.Name = "cRVMain";
			this.cRVMain.ReportSource = null;
			this.cRVMain.Size = new System.Drawing.Size(292, 232);
			this.cRVMain.TabIndex = 0;
			// 
			// cBxRptList
			// 
			this.cBxRptList.Dock = System.Windows.Forms.DockStyle.Top;
			this.cBxRptList.Location = new System.Drawing.Point(0, 0);
			this.cBxRptList.Name = "cBxRptList";
			this.cBxRptList.Size = new System.Drawing.Size(292, 24);
			this.cBxRptList.TabIndex = 1;
			this.cBxRptList.Text = "-- pick report from list --";
			this.cBxRptList.SelectedIndexChanged += new System.EventHandler(this.cBxRptList_SelectedIndexChanged);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
			this.ClientSize = new System.Drawing.Size(292, 260);
			this.Controls.Add(this.cBxRptList);
			this.Controls.Add(this.cRVMain);
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "Special Reports";
			this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
			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)
		{
			//Populate the Combo Box with the report names
			cBxRptList_Fill();
		}

		private void cBxRptList_Fill()
		{
			//Create a temp table to hold the reports description and path
			DataTable cBxContents = new DataTable ();
			cBxContents.Columns.Add ("Description", System.Type.GetType("System.String"));
			cBxContents.Columns.Add ("Path",System.Type.GetType("System.String"));
			//Create the first row of the temp table to tell users what to do
			string[] FirstRow = {" -- select a report to view --", "-1"};
			cBxContents.Rows.Add (FirstRow);
			//Pickup all the crystal reports in the rpts subdirectory of the program
			string[] fileList =  Directory.GetFiles (Directory.GetCurrentDirectory() + @"\rpts", "*.rpt");
			foreach (string item in fileList)
			{
				//add all the friendly report names into the temp table
                int startPt = item.ToString().LastIndexOf(@"\rpts");
				string[] rowData = {item.Substring(startPt + @"\rpts".Length + 1, item.ToString ().Length - (startPt + @"\rpts".Length + 1)),item};
				cBxContents.Rows.Add (rowData);
			}
			//assign the temp table to the combo box
			cBxRptList.DataSource = cBxContents;
			cBxRptList.DisplayMember = "Description";
			cBxRptList.ValueMember = "Path";
		}

		private void cBxRptList_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			//identify if the first combo box item is not selected
			switch (cBxRptList.SelectedIndex > 0)
			{
					//if another line in the combo box is selected then view the report 
                    case true:
						cRVMain.ReportSource = cBxRptList.SelectedValue ;
						cRVMain.Zoom (25);
						break;
					//if the first line in the combo box is selected then clear the report
					case false:
						cRVMain.ReportSource = null;
						break;
             }
        }
	}
}