Datatables not retaning values when merging into one

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ASP.NET

dataset

Hello!!

I am trying to merge two datatables into one. The problem that i a facing is that when merging values from only one table is showing in the third table not from the second.

Dim dt1 As DataTable = ds.Tables("Mon")
      Dim dt2 As DataTable = ds.Tables("Vcr")
      Dim dtAll As DataTable = dt1.Copy()
      dtAll.Merge(dt2)

please tell me what's wrong ..