VB上拉列表框的选择项改变事件

VB下拉列表框的选择项改变事件
以下是我的某个窗体的加载和下拉框列表选择项改变事件
不写下拉框列表选择项改变事件时一切正常，省份正确读取并绑定到下拉框列表中，但
写了下拉框列表选择项改变事件后，就报错了，错误：从类型“DataRowView”到类型“Integer”的转换无效。对应红色字体

Private Sub ProviceCityForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) 
  Dim conStr As String
  conStr = "Data Source=.;Initial Catalog=MyTestDB;Integrated Security=True"
  Dim con As New SqlConnection(conStr)

  '查询所有省份
  Dim sql As String
  sql = "SELECT * FROM [MyTestDB].[dbo].[provinceCity] WHERE ParentId = 0"
  Dim adapter As New SqlDataAdapter(sql, con)
  Dim ds As New DataSet()
  adapter.Fill(ds)
  '绑定所有省份下拉列表框
  Me.cboProvice.DataSource = ds.Tables(0)
  Me.cboProvice.DisplayMember = "Name"
  Me.cboProvice.ValueMember = "ID"
  End Sub

  Private Sub cboProvice_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboProvice.SelectedIndexChanged
  Dim conStr As String
  conStr = "Data Source=.;Initial Catalog=MyTestDB;Integrated Security=True"
  Dim con As New SqlConnection(conStr)

  '查询所有省份
  Dim pId As Integer
  pId = Me.cboProvice.SelectedValue
  Dim sql As String
  sql = "SELECT * FROM [MyTestDB].[dbo].[provinceCity] WHERE ParentId = " & pId
  Dim adapter As New SqlDataAdapter(sql, con)
  Dim ds As New DataSet()
  adapter.Fill(ds)
  '绑定所有省份下拉列表框
  Me.cboCity.DataSource = ds.Tables(0)
  Me.cboCity.DisplayMember = "Name"
  Me.cboCity.ValueMember = "ID"
  End Sub

[解决办法]
Me.cboProvice.SelectedValue,这是你下拉框中选中的数据吧，是数字吗？
[解决办法]
改为Me.cboProvice.text
[解决办法]
下拉框用绑定的话读出来的项类型是DataRowView.

VB.NET code

Dim pId As IntegerDim rv As DataRowViewrv = Me.cboProvice.SelectedValuepId = rv("列名")
[解决办法]
在load的事件中，开始的地方删除cboProvice_SelectedIndexChanged的监听，在结束处在添加上