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C# System.Convert.ToBase64String()

Converts an array of 8-bit unsigned integers to its equivalent string representation that is encoded with base-64 digits.

Function

public static string ToBase64String( byte[] inArray )

Parameters

inArray - An array of 8-bit unsigned integers.

Return value

The string representation, in base 64, of the contents of inArray.

Example
string base64Decoded = "base64 encoded string";
string base64Encoded;
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes(base64Decoded);
base64Encoded = System.Convert.ToBase64String(data);
Github

https://github.com/base64encode/examples/blob/master/base64encode.cs