การหาผลรวม String ใน Gridview แบบมีเงื่อนไข หาได้แต่ผลรวมไม่ถูก

Private Sub dgvInvent_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles dgvInvent.RowDataBound
        lblTotalQty.Text = dgvInvent.Rows.Count
For Each dgvR As GridViewRow In dgvInvent.Rows
            Dim lblStatus As Label = DirectCast(e.Row.FindControl("lblStatus"), Label)
            If lblStatus.Text = "Inventory" Then
                lblTotalInvent.Text = Convert.ToInt32(lblTotalInvent.Text) + 1
            ElseIf lblStatus.Text = "Transfer" Then
                lblTotalTransfer.Text = Convert.ToInt32(lblTotalTransfer.Text) + 1
            ElseIf lblStatus.Text = "Reserve" Then
                lblTotalReserve.Text = Convert.ToInt32(lblTotalReserve.Text) + 1
            End If
Next
End Sub