Try:
DataTable dtMeetingDetail = objMeetingBAL.GetMeetingForId("GetMeetingDetailsForID", MeetingId);
for (int i = 0;i<dtmeetingdetail.rows.count;>
{
ListItem li = new ListItem();
code = dtMeetingDetail.Rows[i]["EmployeeCode"].ToString();
name = dtMeetingDetail.Rows[i]["EmployeeName"].ToString();
string emailid = dtMeetingDetail.Rows[i]["EmailId"].ToString();
Session["emailid"] = emailid;
li.Value = code + '_' + name;
li.Text = code + '_' + name;
chkBxToInvite.Items.Add(li);
items.Selected = true;
}