Question

I am stuck with an issue.
I have two datatables, with the same table structure, i need to select data from table1 such that the records arent existing in table2
is it possible to do this in vb.net? if yes then how?

Table1(AAno,Agencyname,location)
Table2(AAno,Agencyname,location)

Criteria:Select AAno,Agencyname,location from table1,table2 where table1.AAno<>table2.AAno

Answer 1

You could use LINQ-to-DataSet and Enumerable.Except to find the rows in table1 that are not in table2. Assuming that AAno is the primary key:

Dim t1AAno = table1.AsEnumerable().Select(Function(r) r.Field(Of Int32)("AAno"))
Dim t2AAno = table2.AsEnumerable().Select(Function(r) r.Field(Of Int32)("AAno"))
Dim uniqueAAno = t1AAno.Except(t2AAno).ToList()
Dim tblResult = (From row In table1.AsEnumerable()
                 Join AAno In uniqueAAno
                 On row.Field(Of Int32)("AAno") Equals AAno
                 Select row).CopyToDataTable()