Filter a data grid with text boxes.

This code works, but i have several text boxes one for each column.  When you type into a new text box it reset the gridview.  How can i get the filter rows to stay when a new text box is typed into?

   Private Sub FILTER_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles tbtrackingnumber.KeyUp, tboriginator.KeyUp, tbboxnumber.KeyUp, tbcarrier.KeyUp, tbcarrierservice.KeyUp, tbfirstname.KeyUp, tblastname.KeyUp, tblocker.KeyUp, tbmiddlename.KeyUp, tbpackagetype.KeyUp, tbsubbox.KeyUp
        Try
            If tbtrackingnumber.Text.Length > 0 Then
                Dim bsfindapackage As New BindingSource
                bsfindapackage.DataSource = dvfindapackage
                dgfindapackage.DataSource = bsfindapackage
                bsfindapackage.Filter = "([" & sender.tag & "] like '*" & sender.Text & "*')"
            End If
        Catch ex As Exception
            mainform.errorwrite(ex.ToString & " tracking number key up")
        End Try
    End Sub
End Class

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