CPFCNPJ (nuget): CPF / CNPJ Framework Methods that help you to check and format the special numbers of CPF and CNPJ. Help me a lot and I'm putting here to help other people.  Example to use the code:              //check CNPJ             CPFCNPJ.IMain main1 = new CPFCNPJ.Main();             var resultCNPJ = main1.IsValidCPFCNPJ("55645180000150");             Console.WriteLine(resultCNPJ);              //check CPF             var resultCPF = main1.IsValidCPFCNPJ("90099299033");             Console.WriteLine(resultCPF);
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