CSharp - Will the code compile: structure syntax?

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Question

Will the code compile? 

struct MyStructure3
{
    MyStructure3()
    { }
}


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No. We cannot use the explicit parameterless constructor here.

Can a structure contain properties? 

struct MyStructure3
{
    private int myInt;
    public int MyInt
    {
        get
        {
            return myInt;
        }
        set
        {
            myInt = value;
        }
    }
}


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Yes.

Can we create a structure like this? 

struct S
{
    protected int i;
}


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No. structs can implement an interface but they cannot inherit from another struct. 
For that reason, struct members cannot be declared as protected.

Will the code compile? 

using System;

struct OuterStruct
{
    public void Show()
    {
        Console.WriteLine("I am in OuterStruct");
    }
    // internal struct InnerStruct
    protected struct InnerStruct
    {
        public void Show()
        {
            Console.WriteLine("I am in InnerStruct");
        }
    }
}


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No. protected or protected internal is not allowed here.