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Compiler Warning (level 1) CS0420
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Compiler Warning (level 1) CS1060
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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 Warning (level 1) CS3009

Visual Studio 2012

'type': base type 'type' is not CLS-compliant

A base type was marked as not having to be compliant with the Common Language Specification (CLS) in an assembly that was marked as being CLS compliant. Either remove the attribute that specifies the assembly is CLS compliant or remove the attribute that indicates the type is not CLS compliant. For more information on CLS Compliance, see Language Independence and Language-Independent Components.

The following example generates CS3009:

Copy 
// CS3009.cs

using System;

[assembly:CLSCompliant(true)]
[CLSCompliant(false)]
public class B
{
}

public class C : B   // CS3009
{
    public static void Main () {}
}
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