Using recordsets or equivelant in vb express working with sql server tables

I am working vb express 2010 and connected to an SQL server in Management Studio Express 2008.

I need to lookup each instance of startdate in tbl_1 and check every row of tbl_2, inserting a the downtime code from tbl_1 when the downtimecode is not currently null

tbl_1

ID     StartDate      StopDate       StopTime    DowntimeCode

1       2014-01-01   2014-01-02         24                     3
2       2014-01-02   2014-01-03         31                     6
3


tbl_2

ID     StartDate      StopDate       StopTime    DowntimeCode
         2014-01-01                                                          3
         2014-01-01                                                          3
         2014-01-02                                                          6

I must do this procedure from vb.

Thankyou very much for your assistance.
SweetingAAsked:
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CodeCruiserCommented:
You can populate two datatables in vb.net and then use following code


For i As Integer = 0 to dTable1.Rows.Count - 1
  dTable2.DefaultView.RowFilter = "StartDate='" & dTable1.Rows(i).item("StartDate")
  if dTable2.DefaultView.Count > 0
     dTable1.Rows(i).Item("DowntimeCode") = dTable2.DefaultView.Item(0).Item("DowntimeCode")
  End If
Next

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