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Example

void ConfigureRequest(HttpWebRequest request)
{
 if (request == null) throw new ArgumentNullException("request");
 request.Method = "POST";
 request.Headers.Add("header", "value");
}

Why is this bad?

1. Very easy for a null reference exception.
2. Potentially confusing api. (Should I set the Headers property or call methods on the property?)
3. Chance that we're operating at the wrong level of abstraction.