private void Form1_Load(object sender, System.EventArgs e)
		{
			ShowFiles();	
		}
		
		private void ShowFiles()
		{
			this.listBox1.Items.Clear();
			foreach (string filename in Directory.GetFiles("img"))
			{
				this.listBox1.Items.Add(filename);
			}
		}

		private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			im = Image.FromFile(this.listBox1.SelectedItem.ToString());
			this.pictureBox1.Image = im;
		}

		private void delete_btn_Click(object sender, System.EventArgs e)
		{
			try
			{
				if(File.Exists(this.listBox1.SelectedItem.ToString()))
				{
					this.pictureBox1.Image.Dispose();
					this.pictureBox1.Image = null;
					File.Delete(this.listBox1.SelectedItem.ToString());
					ShowFiles();
				}
			}
			catch(Exception ex)
			{
				MessageBox.Show(ex.Message);
			}
		}