DefaultNetworkCredentials or DefaultCredentials

They are exactly the same thing, which you can confirm for yourself using a disassembler like Reflector. The only difference is that DefaultNetworkCredentials returns a NetworkCredentials object and and DefaultCredentials casts it to ICredentials. So you have access to more information with a NetworkCredentials object, but which of those you use supply to an object requiring an ICredentials instance makes no difference, since it’s the same object instance: object.ReferenceEquals(CredentialCache.DefaultCredentials, CredentialCache.DefaultNetworkCredentials) returns true.

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