C# snippet below helps to read SQL data to List<T> generic collection without any extensions or frameworks only with SQL and LINQ.

SqlDataSource sdc = SomeFunctionToGetSqlData(string param);
DataSourceSelectArguments args = new DataSourceSelectArguments();
DataView dv = sdc.Select(args) as DataView;
DataTable dt = dv.ToTable() as DataTable;
List<SalaryInfo> allpays = new List<SalaryInfo>();

allpays = (from DataRow row in dt.Rows
              select new SalaryInfo
                  description = row["description"].ToString(),
                  sum = Convert.ToDecimal(row["sum"].ToString()),
                  type = row["type"].ToString()