C#

Form1()<br />
{<br />
    ...<br />
    void SomeMethod(..)<br />
    {<br />
        Form2 f = new Form2(.., connectionObj, transactionObject..)<br />
        f.Show();<br />
    }<br />
    ...<br />
}

...<br />
connectionObj.Open();<br />
transactionObj= conn.BeginTransaction();<br />
// Some insertions int the database..<br />
...<br />
// I hide the Form2<br />
this.Hide();

[Designer(typeof(MBen.Windows.Forms.Wizard.Design.WizardDesigner))]
public class Wizard : System.Windows.Forms.Form
{
...
}
</pre/
Here's the designer:
<pre>
public class WizardDesigner : System.Windows.Forms.Design.ControlDesigner
{
	private DesignerVerb[] m_Verbs;

	public WizardDesigner()
	{
		System.Diagnostics.Debug.WriteLine("Inited");
		m_Verbs = new DesignerVerb[1];
		m_Verbs[0] = new DesignerVerb("Add/Remove Pages", new EventHandler(OnAddRemovePages));
	}

	public override DesignerVerbCollection Verbs
	{
		get
		{
			System.Diagnostics.Debug.WriteLine("Doh");
			return new DesignerVerbCollection(m_Verbs);
		}
	}

	protected void OnAddRemovePages(object sender, EventArgs e)
	{
		MessageBox.Show("Clicked");
	}
}

<br />
void MyPluginFunction (params object [] data)<br />
{<br />
  // Convert information stored in 'data' into a ptr<br />
  ptr = MarshalObjToPtr(data);<br />
  PluginFunction(ptr);<br />
}<br />

<br />
void PluginFunction (IntPtr ptr)<br />
{<br />
  myData = (MyStruct)Marshal.PtrToStructure(ptr);<br />
  ...<br />
}<br />

<br />
MyPluginFunction(12, 8, "hello");<br />

<br />
private struct MyStruct<br />
{<br />
  int a, b;<br />
  string s;<br />
}<br />