To encode and decode Base64 in C# and VB.NET you can use the following snippet.

Samples

Sample C#

public string EncodeBase64(string input)
{
   return System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(input));
}

public string DecodeBase64(string input)
{
   return System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(input));
}

Sample VB.NET

Public Function EncodeBase64(input As String) As String
	Return System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(input))
End Function

Public Function DecodeBase64(input As String) As String
	Return System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(input))
End Function

Compatibility: .NET 2.0 .NET 3.0 .NET 3.5 .NET 4.0 .NET 4.5 .NET 4.6

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Related links:

• Base64
• What is base 64 encoding used for?
• Why does a base64 encoded string have an = sign at the end