Interface inheritance good. In general, implementation inheritance bad.

>In the early days of .NET (1.0 and 1.1), there were some WinForm controls that didn't work quite right and sub-classing them was the only way to get around their quirkiness (ComboBoxes come to mind, I think ... it was a long time ago <g>). Plus, it seemed at the time, that I was always needing to add some functionality to a control (TextBox or whatever), that was needed throughout my application. So, we sub-classed everything. Now, granted, I had just jumped from VFP to .NET, so perhaps it was out of habit. But, at the time, it seemed the only way to solve the issues we were having.
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>Not sure what point you're trying to make about interfaces ...
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>~~Bonnie