C#

using System.IO;

namespace CreateDT
{
    static class Program
    {
        static void Main()
        {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
        }
        static void MyMethod (name1 string, name2 string)
        {
        // do some stuff with files using the names provided
        }
    }
}

using System;
// other using statements

namespace CreateDT
{
    public partial class Form1 : Form
    {
        //variable definitions..
        public Form1()
        {
             InitializeComponent();
        }
        private void DoItButton_Click(object sender, EventArgs e)
        {
        // set names of currentfile, TargetFile
        MyMethod(currentfile, TargetFile);
        }

<pre>public void SetProperty<T>(string propertyName, ref T propertyField, T value)
{
    if (!Object.Equals(value, propertyField))
    {
        if (OnPropertyChanging(propertyName, propertyField, value))
        {
            IsDirty = true;

            T oldValue = propertyField;
            propertyField = value;

            RaisePropertyChanged(propertyName);
            OnPropertyChanged(propertyName, oldValue, propertyField);
        }
    }
}

<pre>private string _CompanyName;
public string CompanyName
{
    get { return _CompanyName; }
    set
    {
        if (_CompanyName != value)
        {
            SetProperty<string>("CompanyName", ref _CompanyName, value);
        }
    }
}

private decimal? _GLRate;
public decimal? GLRate
{
    get { return _GLRate; }
    set
    {
        SetProperty<decimal>("GLRate", ref _GLRate, value);
    }
}

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog opf = new OpenFileDialog();
            opf.Filter = "Choose Image(*.jpg;*.png;*.gif)|*.jpg;*.png;*.gif";
            if (opf.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = Image.FromFile(opf.FileName);
            }
            Bitmap bmp = new Bitmap(opf.FileName);
            pictureBox1.Image = Image.FromFile(opf.FileName);     
        }