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copied!<p>They have separate compilers (csc.exe for C# and vbc.exe for VB.Net) but they both get compiled into IL and then at run-time JIT compiles it into machine code. </p> <p>Question 1 : can C# compiler compile VB.net code? </p> <p>Answer 1: No it can't and you will see that in the below example. It gives an error if you try to do that as it looks for C# syntax.</p> <p>Question 2: I think that's what they say in the book. Since it is two compilers, I feel it is not compatible</p> <p>Answer 2: It doesn't say that you can compile VB code using C# but it says that you can mix languages in a single application like I did in the example below and still able to compile C# and VB (using their compilers). </p> <p>See below example to understand how it works. I created a solution with a C# project with a C# class and a VB project with a VB class. You should not mix C# and VB classes in same project as it will ignore the vb file if its a C# project during build.</p> <p><img src="https://i.stack.imgur.com/6pBPR.png" alt="Solution Structure"></p> <p>Content of ClassCSharp.cs:</p> <pre><code>namespace ClassLibraryCSharp { public abstract class ClassCSharp { public int MyProperty { get; set; } protected abstract void Test(); } } </code></pre> <p>Content of ClassVBInCSharp.vb in C# ClassLibrary. See how I can inherit from a C# class and also access its properties and override the method.</p> <pre><code>Namespace ClassLibraryVB Public Class ClassVBInCSharp Inherits ClassCSharp Property Test2 As Integer Protected Overrides Sub Test() Test2 = MyBase.MyProperty End Sub End Class End Namespace </code></pre> <p>See below commands I ran: </p> <pre><code>vbc.exe /reference:"ClassLibraryCSharp.dll" /target:library /out:"ClassLibraryCSharpVbVersion.dll" "ClassVBInCSharp.vb" Microsoft (R) Visual Basic Compiler version 12.0.20806.33440 Copyright (c) Microsoft Corporation. All rights reserved. </code></pre> <p>See above VB Compiler is used to compile vb class.</p> <pre><code>csc.exe /reference:"ClassLibraryCSharp.dll" /target:library /out:"ClassLibraryCSharpVersion.dll" "ClassVBInCSharp.vb" Microsoft (R) Visual C# Compiler version 4.0.30319.33440 for Microsoft (R) .NET Framework 4.5 Copyright (C) Microsoft Corporation. All rights reserved. ClassLibrary1\ClassVBInCSharp.vb(1,1): error CS 0116: A namespace cannot directly contain members such as fields or methods </code></pre> <p>See above if I try to use C# Compiler to compile vb class it throws an error as its looking for C# syntax.</p>

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