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C# Compiler Errors
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Compiler Error CS0019
Compiler Error CS0029
Compiler Error CS0034
Compiler Error CS0038
Compiler Error CS0039
Compiler Error CS0050
Compiler Error CS0051
Compiler Error CS0052
Compiler Error CS0071
Compiler Error CS0103
Compiler Error CS0106
Compiler Error CS0115
Compiler Error CS0116
Compiler Error CS0120
Compiler Error CS0122
Compiler Error CS0134
Compiler Error CS0151
Compiler Error CS0163
Compiler Error CS0165
Compiler Error CS0173
Compiler Error CS0178
Compiler Error CS0188
Compiler Error CS0201
Compiler Error CS0229
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Compiler Error CS0304
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Compiler Error CS0433
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Compiler Error CS0650
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Compiler Error CS0702
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Compiler Error CS0840
Compiler Error CS0843
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Compiler Error CS1564
Compiler Error CS1567
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Compiler Error CS2032
Compiler Warning (level 1) CS0420
Compiler Warning (level 1) CS0465
Compiler Warning (level 1) CS1058
Compiler Warning (level 1) CS1060
Compiler Warning (level 1) CS1598
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Compiler Warning (level 1) CS1616
Compiler Warning (level 1) CS1658
Compiler Warning (level 1) CS1683
Compiler Warning (level 1) CS1685
Compiler Warning (level 1) CS1690
Compiler Warning (level 1) CS1691
Compiler Warning (level 1) CS1699
Compiler Warning (level 1) CS1762
Compiler Warning (level 1) CS1956
Compiler Warning (level 1) CS3003
Compiler Warning (level 1) CS3007
Compiler Warning (level 1) CS3009
Compiler Warning (level 1) CS4014
Compiler Warning (level 2) CS0108
Compiler Warning (level 2) CS0467
Compiler Warning (level 2) CS0618
Compiler Warning (level 2) CS1701
Compiler Warning (level 3) CS0675
Compiler Warning (level 3) CS1700
Compiler Warning (level 4) CS0429
Compiler Warning (level 4) CS1591
Compiler Warning (level 4) CS1610
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Compiler Error CS0122

Visual Studio 2012

'member' is inaccessible due to its protection level

The access modifier for a class member prevents accessing the member. For more information, see Access Modifiers (C# Programming Guide).

One cause of this (not shown in the sample below) can be omitting the /out compiler flag on the target of a friend assembly. For more information, see Friend Assemblies (C# and Visual Basic) and /out (C# Compiler Options)

The following sample generates CS0122:

Copy 
// CS0122.cs
public class MyClass
{
    // Make public to resolve CS0122
    void MyMethod()
    {
    }
}

public class MyClass2
{
    public static int Main()
    {
        MyClass a = new MyClass();
        // MyMethod is private
        a.MyMethod();   // CS0122
        return 0;
   }
}
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