private void btnOK_Click(object sender, EventArgs e)
        {
            int countError = 0;

            if (CheckError.CheckErrors(tbEmail))
            {
                countError++;
            }
            if (CheckError.CheckErrors(tbNewPassword))
            {
                countError++;
            }
            if (CheckError.CheckErrors(tbRepeatPassword))
            {
                countError++;
            }
            if (CheckError.CheckErrors(tbNewPassword, tbRepeatPassword))
            {
                countError++;
            }

            if (countError == 0)
            {
                DialogResult = DialogResult.OK;
            }
        }