Maybe as a DLL?
But - what's so "secret and special" about your code, are you embarrassed by it?
Even if you put your code in a DLL, make sure it's abstract enough for the user. Since no-one wants to route through several layers of classes, declaring objects to be used by other objects, when just calling one function from a single class could have done it.
Code is still nice as a documentation, unless you've documented it well.
For Each ctrl As Control In Me.Controls("pnlMainPanel").Controls
If ctrl.GetType Is GetType(System.Windows.Forms.Panel) Then
For Each subCtrl As Control In ctrl.Controls
If subCtrl.GetType Is GetType(System.Windows.Forms.TextBox) Then
If subCtrl.GetType Is ...