C#

TaiZhong wrote:

I would like to create a method that within the method it will handle the mouse click event and after the user has input 2 points the method will return a value back to the caller.

using System;
using System.Runtime.InteropServices

//this class is unmanaged code
class UnmanagedAccessDll
{
//use to import your method in your dll
  [DllImport("myDll.dll")]
public static extern void StartWizard([required parameters if any]);
}
//sample managed class code
public ManagedAccessDll
{
  public void Startwizard([required parameters if any]){
UnmanagedAccessDll.Startwizard([required parameters if any]);
}
} 

or you can call directly in your code

...
UnmanagedAccessDll.Startwizard([required parameters if any]);
...

// This method has many options - check MSDN
TreeNode node = new TreeNode("Node Text"); 
treeView1.Nodes.Add(node);

Form2 form2 = new Form2();
form2.MdiParent = this;
form2.Show();

stovesy wrote:

My factory objects all derive from a FactoryBase class.
The FactoryBase class is generic (FactoryBase<t> where T : IBusinessObjectBase)
I have an IFactoryBase interface, which the FactoryBase impliments.
public interface IFactoryBase<t> where T : IBusinessObjectBase

class FactoryBase<t> : IFactoryBase<t> where T : IBusinessObjectBase ...</t></t>