Private Sub InitializeOpenFileDialog()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog

        ' Set the file dialog to filter for graphics files.
        Me.OpenFileDialog1.Filter = _
        "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|All files (*.*)|*.*"

        ' Allow the user to select multiple images.
        Me.OpenFileDialog1.Multiselect = True
        Me.OpenFileDialog1.Title = "My Image Browser"
    End Sub

    Private Sub fileButton_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles FileButton.Click
        OpenFileDialog1.ShowDialog()
    End Sub

	private void InitializeOpenFileDialog()
	{
		this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();

		// Set the file dialog to filter for graphics files.
		this.openFileDialog1.Filter = 
			"Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" + 
			"All files (*.*)|*.*";

		// Allow the user to select multiple images.
		this.openFileDialog1.Multiselect = true;
		this.openFileDialog1.Title = "My Image Browser";
		
	}

	private void fileButton_Click(System.Object sender, System.EventArgs e)
	{
		openFileDialog1.ShowDialog();
	}

void InitializeOpenFileDialog()
{
   this->OpenFileDialog1 = gcnew System::Windows::Forms::OpenFileDialog;

   // Set the file dialog to filter for graphics files.
   this->OpenFileDialog1->Filter =
      "Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" +
      "All files (*.*)|*.*";

   // Allow the user to select multiple images.
   this->OpenFileDialog1->Multiselect = true;
   this->OpenFileDialog1->Title = "My Image Browser";
}

void fileButton_Click( System::Object^ sender, System::EventArgs^ e )
{
   OpenFileDialog1->ShowDialog();
}

setting the Title and Filter properties, and allowing the user
to select multiple files by setting the MultiSelect property to true. 

To run this example paste the following code in a form containing an
OpenFileDialog named OpenFileDialog1 and a Button named fileButton.
Call the InitializeOpenFileDialog method in the form's constructor