ASP.NET MVC Custom Model Binder – Safe Updates for Unspecified Fields
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Model Binders are one of the ASP.NET MVC framework’s celebrated features.
The good part: you just saved a lot of code, which is good for efficiency and for supporting/debugging.
The bad part: what happens when we edit/update an object and the form does not include all the fields? We just overwrote the value to the default .NET value and saved to the db.