Hi Luis,

Could you tell me why you need to save the value of the properties
configured in WinForm controls into binary files?

If you implement a custom form designer and would like to generate source
code to serialize the forms and controls on this form, you need to use the
CodeDomDesignerLoader class.

For more information on how to do this, please refer to the following MSDN
magazine article:

'Create And Host Custom Designers With The .NET Framework 2.0'
http://msdn.microsoft.com/msdnmag/issues/06/03/DesignerHosting/default.aspx

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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If you must serialize to a binary format, you'll need to create a
serializable class to store this information. If you can serialize to XML,
you can bind these properties to User Application Settings which will be
saved as XML in the user config file.