(.NET Core C#) MIME Header Q and B Encoding and Decoding

Demonstrates how to Q and B encode/decode.

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Chilkat.StringBuilder sb = new Chilkat.StringBuilder();
bool success;

sb.Append("This is a test");

Debug.WriteLine(sb.GetEncoded("B","utf-8"));
//  output is:
//  =?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=

Debug.WriteLine(sb.GetEncoded("Q","iso-8859-1"));
//  output is:
//  =?utf-8?Q?This_is_a_test?=

Chilkat.StringBuilder sb2 = new Chilkat.StringBuilder();

sb2.Append("=?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=");
sb2.Decode("B","utf-8");
Debug.WriteLine(sb2.GetAsString());

//  output is:
//  This is a test

sb2.Clear();
sb2.Append("=?utf-8?Q?This_is_a_test?=");
sb2.Decode("Q","utf-8");
Debug.WriteLine(sb2.GetAsString());

//  output is:
//  This is a test

//  "B" or "Q" will decode both B and Q.
sb2.Clear();
sb2.Append("=?utf-8?Q?This_is_a_test?= 123 =?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=");
sb2.Decode("Q","utf-8");
Debug.WriteLine(sb2.GetAsString());

//  output is:
//  This is a test 123 This is a test