private void cmbClass_EditValueChanged(object sender, EventArgs e)
{
try
{
var dc = new ClassSRMDataContext(Config.connection);
bsStudent.DataSource = dc.SelectGifts((int)cmbClass.EditValue, strYear + "/" + strCurMonth + "/" + "01", strYear + "/" + strCurMonth + "/" + "31", strYear + "/" + PrevMonth.ToString("00") + "/" + "01", strYear + "/" + PrevMonth.ToString("00") + "/" + "31");
}
catch (Exception ex)
{
XtraMessageBox.Show(ex.Message, "خطا", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}