Convert DataTable to Generic List

Convert DataTable to Generic List

I have a below method in dataService layer:
public DataTable retTable ()
{
DataTable dt = new DataTable();
adap.Fill(dt);
return dt;
}
because I should add (using Data) name space in business layer. I wanna
change it to:
public List<DataTable> retTable()
{
DataTable dt = new DataTable();
adap.Fill(dt);
List<DataTable> lst = new List<DataTable>();
lst.AddRange(dt);
return lst ;
}
but I have error in
lst.AddRange(dt);
how can i solve it?