LINQ query on a DataTable

Question

I\'m trying to perform a LINQ query on a DataTable object and bizarrely I am finding that performing such queries on DataTables is not straightforward. For example:

Answer 1

                    //Json Formating code
                    //DT is DataTable
                    var filter = (from r1 in DT.AsEnumerable()

                                  //Grouping by multiple columns 
                                  group r1 by new
                                  {
                                      EMPID = r1.Field("EMPID"),
                                      EMPNAME = r1.Field("EMPNAME"),

                                  } into g
                                  //Selecting as new type
                                  select new
                                  {

                                      EMPID = g.Key.EMPID,
                                      MiddleName = g.Key.EMPNAME});