private List<string> Supervisor(DataRow[] drSpareTimeClass, DataRow[] drSupervisor)
{
supervisor=new List<string>();
for (int i = 0; i < drSupervisor.Length;i++ )
{
for (int j = 0; j < drSpareTimeClass.Length;j++ )
{
if (drSupervisor[i]["Teacher"].Equals(drSpareTimeClass[j]["Supervisor"]))
{
supervisor.Add(drSupervisor[i]["Teacher"].ToString());
break;
}
}
}
return supervisor;
}