(.NET Core C#) Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

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Chilkat.BinData bd = new Chilkat.BinData();

//  I created an extra-small GIF image for this example..
bool success = bd.LoadFile("qa_data/gif/xsmall.gif");
if (success != true) {
    Debug.WriteLine("Failed to load GIF image file.");
    return;
}

//  Show GIF bytes as base64:
Debug.WriteLine(bd.GetEncoded("base64"));

//  This particular GIF in base64 is this:
//  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

//  Let's begin with an XML string:
string x = "<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>";

Chilkat.Xml xml = new Chilkat.Xml();
success = xml.LoadXml(x);

//  Get the base64 string:
string gifBase64 = xml.GetChildContent("def");

Debug.WriteLine(gifBase64);

//  Load bd with the base64 decoded bytes.
bd.Clear();
bd.AppendEncoded(gifBase64,"base64");

//  Save to a GIF file.
success = bd.WriteFile("qa_output/xsmall.gif");