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VB 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 Shared Function FromBase64String ( s As String ) As Byte()

Parameters

s - The string to convert

Return value

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

Example
Dim base64Encoded As String = "YmFzZTY0IGVuY29kZWQgc3RyaW5n"
Dim base64Decoded as String
Dim data() As Byte
data = System.Convert.FromBase64String(base64Encoded)
base64Decoded = System.Text.ASCIIEncoding.ASCII.GetString(data)
Github

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

See also:
VB ToBase64String