PHP ASP.NET等效BASE64

public   static   string   Base64Encode(string   AStr)
{
        return   Convert.ToBase64String(Encoding.UTF8.GetBytes(AStr));
}
public   static   string   Base64Decode(string   ABase64)
{
        return   Encoding.UTF8.GetString(Convert.FromBase64String(ABase64));
}
private   void   button1_Click(object   sender,   EventArgs   e)
{
        Text   =   Base64Decode(Base64Encode( "Zswang   路过 "));
}