Open popup conditional from controler MVC

Function Traitement(model As TraitementViewModel, confirm_value As String) As ActionResult
        Try
            If (ModelState.IsValid) Then
                Dim exception As Exception = Nothing
                Dim mois As Integer = Mid(model.dateTraitement, 4, 2)
                Dim annee As Integer = Right(model.dateTraitement, 4)
                Session("mois") = mois
                Session("annee") = annee
                Dim extract As Extraction = New Extraction()
              
                Dim result As Integer = extract.Recherche(mois, annee).Rows.Count()
                If (result <> 0) Then
                    OPEN POPUP

                       Artciles    Montant
                            1	    100
                            2	    200

                       Do you want continue

                             YES  NO



                      IF(confirm_value = "yes") Then
                       continue...
                      Else
                       Exit Function
                Else
                    continue...
                End If

              
            End If
        
    End Function