Can someone help me Retrieve file from SQL Server vb.net -

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can me?!i having problem project have table named document have fields ( id_d , type_d, date_create_d , way , #nbr_som ) , nbr_som foreign key references table named fonctionnaire when print document example(work certificate),
document registred file pdf in record exemple (d:\bts\document ) , when search work certificate on forme on (vb.net) date of year or month want extract files

this code form contains crystalrepotviewer :

private sub form2_load(byval sender system.object, byval e system.eventargs) handles mybase.load dim r new rcattestationdetravail dim dt datatable

    dt = form1.pfe_grhdataset.enseignants     r.setdatasource(dt)      crystalreportviewer1.reportsource = r     crystalreportviewer1.selectionformula = "{enseignants.num_som} = " & form1.num_somtextbox.text       ''      dim rapport new rcattestationdetravail     dim filename string     dim str string = ":"     filename = "c:\users\salha\documents\attestationdetravail" & datestring & "+" & now.hour & "," & now.minute & "," & now.second & ".pdf"     rapport.setdatasource(dt)     rapport.exporttodisk(crystaldecisions.shared.exportformattype.portabledocformat, filename)     end sub

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