private void btnDecode_Click(object sender, EventArgs e)
 {
     try
     {
         txtSourceCode.Text = Base64Helper.DecodingForString(txtBase64Code.Text, System.Text.Encoding.GetEncoding(DataConvert.GetInt32(txtCode.Text)));
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }