Hey @Gokul_Jayakumar,
You can use the below code,
(From row In dt1.AsEnumerable
Group row By key = New With {
Key.name = row.Item("Name")} Into grp = Group
Select dt1Clone.LoadDataRow(New Object() {
key.name,
String.Join(" ",grp.Select(Function(x)x("Address").ToString).ToArray)
}, True)).CopyToDataTable
Thanks,
Sanjit