private void btnSave_Click(object sender, EventArgs e)
{
Assign assign = new Assign();
assign.StartDate = startDatePicker.Text;
assign.EndDate = endDatePicker.Text;
assign.StartTime = txtStartTime.Text;
assign.EndTime = txtEndTime.Text;
AssignmentManager assignMgr = new AssignmentManager();
assignMgr.StoreNewAssignment(assign);
AfterTheSave();
Refresh();
}