I want to join 2 datatables on multiple conditions in C# using LINQ

var resultingTable1 = from t1 in dtresult.AsEnumerable()
                      join t2 in DB1.AsEnumerable()
                        on new { 
                          LoginID = t1.Field<string>("LoginID"), 
                          ReportDate = t1.Field<DateTime>("ReportDate") } 
                        equals new { 
                          LoginID = t2.Field<string>("Login ID"), 
                          ReportDate = t2.Field<DateTime>("Login time") }
                        select new { t1, t2 };

var resultingTable1 = from t1 in dtresult.AsEnumerable()
                                      join t2 in DB1.AsEnumerable()
                                          on new { LoginID = t1.Field<string>("LoginID"), ReportDate = t1.Field<DateTime>("ReportDate") } equals new { LoginID = t2.Field<string>("Login ID"), ReportDate = t2.Field<DateTime>("Login time") }
                                      select new { t1, t2 };