using System.IO;

Open File Dialog Example

	String Filename;

	//If last directory is not valid then default to My Documents (if you don't include this the catch below won't occur for null strings so the start directory is undefined)
	if (!Directory.Exists(ApMain.LastFileDirectory))
		ApMain.LastFileDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

	//----- FILE OPEN DIALOG BOX -----
	OpenFileDialog SelectFileDialog = new OpenFileDialog();

	SelectFileDialog.Filter = "All Files (*.*)|*.*";		//"txt files (*.txt)|*.txt|All files (*.*)|*.*"
	SelectFileDialog.FilterIndex = 1;				//(First entry is 1, not 0)
	try
	{
		SelectFileDialog.InitialDirectory = ApMain.LastFileDirectory;
	}
	catch (Exception)
	{
		SelectFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
	}
	//Display dialog box
	if (SelectFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
	{
		//----- OPEN THE FILE -----
		FilePath = SelectFileDialog.FileName;

		//STORE LAST USED DIRECTORY
		if (FilePath.LastIndexOf("\\") >= 0)
		{
			ApMain.LastFileDirectory = FilePath.Substring(0, (FilePath.LastIndexOf("\\") + 1));

			//FileName = FilePath.Substring(FilePath.LastIndexOf("\\") + 1);		//<<If you want just the filename
		//if (FileName.LastIndexOf(".") >= 0)
		//	FileName = FileName.Substring(0, (FileName.LastIndexOf(".") + 0));		//<<<If you want the file extension removed
		}
	}