C#

<br />
[System.STAThread]<br />
static void Main() <br />
{<br />
	System.Windows.Forms.Application.Run(new MainForm());<br />
}<br />

using (FolderBrowserDialog dialog = new FolderBrowserDialog())
{
  DialogResult result = dialog.ShowDialog(this);
  if (result == DialogResult.OK)
    somePathVariable = dialog.SelectedPath;
}

<p>// This class can be instantiated by everyone.
public class MyClass
{
  public MyClass() { }
}</p>

<p>// Only classes in the same project can instantiate this class.
public class MyClass
{
  internal MyClass() { }
}</p>

<p>// This class can only be instantiated by itself.
public class MyClass
{
  private MyClass() { }

  public static MyClass CreateInstance()
  {
    return new MyClass();
  }
}</p>