modify XmlDictionaryReaderQuotas

[C# Programming]

Hello,

I have an exception on my web service, the error show that we must modify the value of "XmlDictionaryReaderQuotas" How i can modify the value of "XmlDictionaryReaderQuotas"? whene i can find the file whitch contain "XmlDictionaryReaderQuotas"?
Thank you verry mutch