public List <String> AllKeys()
{
dt = employeeDal.AllKeys();
List <String> tableList = new List <string>();
foreach (DataRow r in dt.Rows)
{
string value = "";
foreach (DataColumn c in dt.Columns)
{
value += r[c].ToString() + " | ";
}
tableList.Add(value);
}
return(tableList);
}