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Code Analyzer for C#

There is a newer version: 10.2.0.105762

Why is this an issue?
Delegate event handlers (i.e. delegates used as type of an event) should have a very specific signature:

   Return type void. 
   First argument of type System.Object and named 'sender'. 
   Second argument of type System.EventArgs (or any derived type) and is named 'e'. 

This rule raises an issue whenever a delegate declaration doesn’t match that signature.
Noncompliant code example
public delegate void AlarmEventHandler(object s);

public class Foo
{
    public event AlarmEventHandler AlarmEvent; // Noncompliant
}

Compliant solution
public delegate void AlarmEventHandler(object sender, AlarmEventArgs e);

public class Foo
{
    public event AlarmEventHandler AlarmEvent; // Compliant
}

Resources
Handling and Raising Events