100% Reflective Class Diagram Creation Tool

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace AutoDiagramer
{
    #region frmSave CLASS
    /// <summary>
    /// An settings form to allow the user to save the current diagram
    /// </summary>
    public partial class frmSave : Form
    {
        #region Instance Fields
        //instance fields
        private string _SaveDirectory;
        private string _SaveFile;
        private ImageFormat _ImgFormat;
        #endregion
        #region Constructor
        /// <summary>
        /// Creates a new frmSave object
        /// </summary>
        public frmSave()
        {
            InitializeComponent();
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw |
                     ControlStyles.DoubleBuffer | ControlStyles.UserPaint, true);
            //add all items to the combo and select the 1st index
            cmbImageFormat.Items.Add("Bmp");
            cmbImageFormat.Items.Add("Emf");
            cmbImageFormat.Items.Add("Exif");
            cmbImageFormat.Items.Add("Gif");
            cmbImageFormat.Items.Add("Jpeg");
            cmbImageFormat.Items.Add("Png");
            cmbImageFormat.SelectedIndex = 0;
            //set default ImageFormat
            RequiredImageFormat = ImageFormat.Bmp;

        }
        #endregion
        #region Public Properties
        /// <summary>
        /// The Save directory
        /// </summary>
        public string SaveDirectory
        {
            get { return _SaveDirectory; }
            set { _SaveDirectory=value; }
        }

        /// <summary>
        /// The Save file
        /// </summary>
        public string SaveFile
        {
            get { return _SaveFile; }
            set { _SaveFile=value; }
        }

        /// <summary>
        /// The image format
        /// </summary>
        public ImageFormat RequiredImageFormat
        {
            get { return _ImgFormat; }
            set { _ImgFormat = value; }
        }
        #endregion
        #region Private Methods
        /// <summary>
        /// Initialise the GUI with a default path for file saving
        /// </summary>
        /// <param name="sender">frmSettings</param>
        /// <param name="e">the event args</param>
        private void frmSettings_Load(object sender, EventArgs e)
        {
            //initialise the GUI with a default path for file saving
            string currPath = @"c:\";
            saveFileDialog1.InitialDirectory = @currPath;
            txtDirectory.Text = @currPath + @"File." + @cmbImageFormat.SelectedItem.ToString();
            SaveDirectory = @currPath;
            SaveFile = txtDirectory.Text;
        }

        /// <summary>
        /// Sets the SaveDirectory property to the value of
        /// the txtDirectory text box and closes this form
        /// </summary>
        /// <param name="sender">btnOk</param>
        /// <param name="e">the event args</param>  
        private void btnOk_Click(object sender, EventArgs e)
        {
            this.DialogResult=DialogResult.OK;
            SaveFile = txtDirectory.Text;
            this.Close();
        }

        /// <summary>
        /// Prompts the user to save a file to a location of their choice
        /// </summary>
        /// <param name="sender">btnDirectory</param>
        /// <param name="e">the event args</param>
        private void btnDirectory_Click(object sender, EventArgs e)
        {
            
            if (saveFileDialog1.ShowDialog(this) == DialogResult.OK)
            {
                if (!saveFileDialog1.FileName.Equals(string.Empty))
                {
                    //OK so, now update GUI and relevant properties
                    txtDirectory.Text = saveFileDialog1.FileName + "." + RequiredImageFormat.ToString();
                    int idx = txtDirectory.Text.LastIndexOf(@"\");

                    SaveDirectory = txtDirectory.Text.Substring(0,idx);
                    SaveFile = txtDirectory.Text;
                    saveFileDialog1.Dispose();
                    GC.Collect();
                }
            }
        }


        /// <summary>
        /// Determines which ImageFormat should now be used, based on
        /// the cmbImageFormat.SelectedItem
        /// </summary>
        /// <param name="sender">cmbImageFormat</param>
        /// <param name="e">the event args</param>
        private void cmbImageFormat_SelectedValueChanged(object sender, EventArgs e)
        {

            //which ImageFormat should now be used
            switch (cmbImageFormat.SelectedItem.ToString())
            {
                case "Bmp":
                    RequiredImageFormat = ImageFormat.Bmp;
                    break;
                case "Emf":
                    RequiredImageFormat = ImageFormat.Emf;
                    break;
                case "Exif":
                    RequiredImageFormat = ImageFormat.Exif;
                    break;
                case "Gif":
                    RequiredImageFormat = ImageFormat.Gif;
                    break;
                case "Jpeg":
                    RequiredImageFormat = ImageFormat.Jpeg;
                    break;
                case "Png":
                    RequiredImageFormat = ImageFormat.Png;
                    break;
                default:
                    RequiredImageFormat = ImageFormat.Bmp;
                    break;
            }

            int idx = txtDirectory.Text.LastIndexOf(".");
            if (idx != -1)
            {
                string fNewName = txtDirectory.Text.Substring(0,idx);
                txtDirectory.Text = fNewName + "." + RequiredImageFormat.ToString();
                SaveFile = txtDirectory.Text;
            }
        }
        #endregion

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.Cancel;
            this.Close();
        }
    }
    #endregion
}