which View engine [Razor or Aspx] should i prefer for dev.

Question

Friends..Need in suggesion,

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i am working on ERP Domain with ASP.net,c# & VB.net. We have 25 modules in our project , previous module are developed in vb.net and C#.net but now we want to move to MVC for new module development.

Is This situation...

1) how do i communicate new module with MVC with previous Modules.

2) And Which View engine [Razor or Aspx] should i prefer.

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please suggest...Thanks in advance