private void Mapping()
        {
            this.word.ClearText     = txtClear.Text;
            this.word.EncryptedText = txtCrypted.Text;

            if (!AppUtils.IsFieldEmpty(txtNumberOffset.Text))
            {
                this.word.NumberOfOffsets = AppUtils.ConvertToNumber(txtNumberOffset.Text);
            }
        }
 private void txtNumberOffset_TextChanged(object sender, EventArgs e)
 {
     if (AppUtils.IsFieldEmpty(txtNumberOffset.Text))
     {
         txtClear.Enabled = false;
     }
     else
     {
         if (!AppUtils.IsOffsetValid(AppUtils.ConvertToNumber(txtNumberOffset.Text)))
         {
             errorProvider1.SetError(txtNumberOffset, AppUtils.PARAM_MSG_INCORRECT_OFFSETS);
             txtClear.Enabled = false;
         }
         else
         {
             errorProvider1.Dispose();
             txtClear.Enabled = true;
         }
     }
 }