asp.net-mvc

ASP.Net MVC4 configuration error after installing MySQL Connector .NET

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I’m creating a MVC4 web application project.When i’m using empty project and simply run it on browser it works fine.But the problem is when i’m trying to create a Internet application project instead of Empty project.Once i created internet application project and when trying to run it on browser it shows following configuration error.As i understood it’s something related to MySQL connector assembly reference.Anyhow following is the error.

Class/Model Level Validation (as opposed to Property Level)? (ASP.NET MVC 2.0)

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Basically, what the title says. I have several properties that combine together to really make one logical answer, and i would like to run a server-side validation code (that i write) which take these multiple fields into account and hook up to only one validation output/error message that users see on the webpage.