I want to store multiple Datatables like in DataSet How can I acheive this
You can start here - VB.NET DataSet Examples - Dot Net Perls - and then if you’ll have any specific questions inquiry further.
only assign activity is available how can I execute the statement ds.Tables.Add( dt );.Sorry this was my actual problem
You can use Invoke Method for it (and all other void method calls).
See here f.e. Use of Invoke Method