My code sample was to demonstrate how to set the Name property using the Collection Count. You should enhance it to perform any validations you feel are appropriate. For the OnSetComplete method to fire, you need to wire up the event. Here is an article that explains how you would implement this in your code:

http://www.informit.com/isapi/product_id~%7B75B108D4-69BE-4A23-A340-D112EC5A1061%7D/st~%7BD06674E4-4033-4F5E-85D4-5D32A6FD7B71%7D/content/index.asp


>Do i have to validate the column name by code?
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>not to accept empty values or duplicate name?
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>i have a problem with the collection class, that class have a method name "OnSetComplete", that it is supposed to fire when the value of the class change, but it does not work.
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>i have MSFlexGrid at wich i add Column Collection property, so at design time when i add objects and change the values on the collection property window, it does not fire "OnSetComplete", but OnInsertComplete works, why?