Port Writer Trace Listener for .NET Applications

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

namespace PerformanceSolutions.WinForms
{
    public partial class LogFileDlg : Form
    {
        private string _FileName = string.Empty;
        private string _FileType = string.Empty;

        public string FileName
        {
            get { return _FileName; }
        }

        public string FileType
        {
            get { return _FileType; }
        }
        
        public LogFileDlg()
        {
            InitializeComponent();
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {
            DlgOpenFile.Filter = "Csv File(*.csv)|*.csv|Xml File(*.xml)|*.xml";
            DlgOpenFile.FilterIndex = 1;
            DlgOpenFile.CheckPathExists = true;
            DlgOpenFile.RestoreDirectory = true;
            DlgOpenFile.Title = "Choose a file name";
            if (DlgOpenFile.ShowDialog() == DialogResult.OK)
            {
                txtFile.Text = DlgOpenFile.FileName;
            }
            else
            {
                return;     //Cancelled
            }

        }

        private void btnOK_Click(object sender, EventArgs e)
        {
            if (txtFile.Text.Length > 0)
            {
                _FileName = txtFile.Text;
                _FileType = FileName.Substring(FileName.Length - 4);
                if (_FileType.ToLower() != ".csv" && _FileType.ToLower() != ".xml")
                {
                    MessageBox.Show("File extension can be only .csv or .xml.", "Wrong file type...", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    txtFile.Focus();
                    return;
                }
            }
            else
            {
                MessageBox.Show("Please enter a file name.", "File name missing...", MessageBoxButtons.OK, MessageBoxIcon.Error);
                txtFile.Focus();
                return;
            }
            this.DialogResult = DialogResult.OK;
            this.Close();
        }

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