编辑按钮：在数据网格视图中从字符串“名称”转换

Question

我正在尝试从Datagridview编辑选定的行。当我尝试更改文本框中的内容时，我收到一条关于姓氏和名字文本框的错误消息，并指出：“从字符串“ name”转换为整数类型是无效的。如果有人可以帮助我弄清楚我的名字，我做错了，将不胜感激。

Dim dbo As New OwnersDataContext
Dim theowner As New Owners
Dim index As Integer

Private Sub DGV1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DGV1.CellContentClick
    index = e.RowIndex
    Dim selectedRow As DataGridViewRow

    selectedRow = DGV1.Rows(index)
    txtid.Text = selectedRow.Cells(0).Value.ToString
    txtfname.Text = selectedRow.Cells(1).Value.ToString
    txtlname.Text = selectedRow.Cells(2).Value.ToString
    txtaddress.Text = selectedRow.Cells(3).Value.ToString
    txtcity.Text = selectedRow.Cells(4).Value.ToString
    cbostates.SelectedItem = selectedRow.Cells(5).Value.ToString
    txtzipcode.Text = selectedRow.Cells(6).Value.ToString
End Sub

Private Sub btnEdit_Click(sender As Object, e As EventArgs) Handles btnEdit.Click
    If DGV1.SelectedRows.Count < 0 Then
        MessageBox.Show("Select owner")
    Else

            **If theowner.Update(txtid.Text, txtfname.Text, txtlname.Text, txtaddress.Text, txtcity.Text, CStr(cbostates.SelectedItem), txtzipcode.Text) = 0** Then
                MessageBox.Show("New Owner could not be saved to database. Please check input.")
            Else
                Me.Close()
                'refill the tbl with the updated
                Dim q = From o In dbo.Owners
                        Select o.Owner_ID, o.Owner_FirstName, o.Owner_LastName, o.Address, o.City, o.State, o.ZipCode
                DGV1.DataSource = q
            End If

    End If
End Sub

添加了我班上的更新方法

 Public Function Update(ByVal pOwnerID As Integer, ByVal pfname As String, 
ByVal plname As String, ByVal pAddress As String, ByVal pCity As String, ByVal pState As String, ByVal pZipCode As Integer) As Integer

 Return mytableadapter.Update(pfname, plname, pAddress, pCity, pState, pZipCode, pOwnerID) > 0
 End Function