[vb.net] เวลากดดับเบิ้ลคลิก DataGridView แล้ว Error ฟ้องว่าค่าว่างอ่ะครับ

    Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
       

        'คลิก  DataGridView แล้วให้ข้อมูลแสดงในtxt
        If e.RowIndex = -1 Then Exit Sub
        With DataGridView1
            txtPlannedListID.Text = CStr(.Rows(e.RowIndex).Cells(0).Value)
            txtItemNo.Text = CStr(.Rows(e.RowIndex).Cells(1).Value)
            cmbItemType.Text = CStr(.Rows(e.RowIndex).Cells(2).Value)
            cmbContractor.Text = CStr(.Rows(e.RowIndex).Cells(3).Value)
            txtOrderedtime.Text = CStr(.Rows(e.RowIndex).Cells(4).Value)
            txtQty.Text = CStr(.Rows(e.RowIndex).Cells(5).Value)
            cmbUnit.Text = CStr(.Rows(e.RowIndex).Cells(6).Value)
            cmbData.Text = CDate(.Rows(e.RowIndex).Cells(8).Value)
            txtRemark.Text =  CStr(.Rows(e.RowIndex).Cells(7).Value)

        End With