int myCounter = 0;
foreach (DataGridItem spriden_ID in dgEmployees.Items)
{
  CheckBox cbSpriden = (CheckBox) spriden_ID.FindControl("cbSpriden");
  if (cbSpriden.Checked)
  {
    //Stuff to add to db here
    myCounter++;
  }
  else
  {
    lblStatus.Text ="Scheduling failed: " + addCourses.ErrorMessage;
  }
}