private void buttonClear_Click(object sender, EventArgs e)
{
this.Enabled = false;
string oper = "";
if (null != comboBoxOperator.SelectedItem)
{
oper = comboBoxOperator.SelectedItem.ToString();
}
logDao.delLog(textBoxModule.Text, oper,
dateTimePickerBegin.Value.Date, dateTimePickerEnd.Value.Date);
buttonQuery_Click(null, null);
this.Enabled = true;
}