Dim str As String = Nothing
        If chkf1.Checked Then
            str = str & " AND idfornitore=" & ddlf1.SelectedValue.ToString
        End If
        If chkf2.Checked = True Then
            str = str & " AND idtipo=" & ddlf2.SelectedValue.ToString
        End If
        If chkf3.Checked = True Then
            str = str & " AND idtipoqta=" & ddlf3.SelectedValue.ToString
        End If
        If chkf4.Checked = True Then
            str = str & " AND qualita=" & ddlf4.SelectedValue.ToString
        End If
        If chkf5.Checked = True Then
            str = str & " AND iddeposito=" & ddlf5.SelectedValue.ToString
        End If
        If str <> Nothing Then
            sqlcoils.SelectCommand = "select * from v_magazzino where kg > 0" & str & " order by sp ASC, larghezza ASC"
            gridview1.DataBind()

        Else
            sqlcoils.SelectCommand = "select * from v_magazzino where kg > 0 order by sp ASC, larghezza ASC"
            gridview1.DataBind()
        End If