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C# System.Convert.FromBase64String()

Converts the specified string, which encodes binary data as base-64 digits, to an equivalent 8-bit unsigned integer array.

Function

public static byte[] FromBase64String( string s )

Parameters

s - The string to convert

Return value

An array of 8-bit unsigned integers that is equivalent to s.

Example
string base64Encoded = "YmFzZTY0IGVuY29kZWQgc3RyaW5n";
string base64Decoded;
byte[] data = System.Convert.FromBase64String(base64Encoded);
base64Decoded = System.Text.ASCIIEncoding.ASCII.GetString(data);
Github

https://github.com/base64decode/examples/blob/master/base64decode.cs