try this:
set textBox2::Text = New System.Text.ASCIIEncoding()::GetString(type Convert::FromBase64String(TextBox1::Text)) *> Decode base 64 to text
try this:
set textBox2::Text = New System.Text.ASCIIEncoding()::GetString(type Convert::FromBase64String(TextBox1::Text)) *> Decode base 64 to text