VB.NET:窗体加载时组合框的SelectedValueChanged事件出错

我有一个函数fill\u cboareat来填充名为cboarea的组合框。此函数将在表单加载时调用。当达到此fill\u cboarea函数时，调试器转到cboarea\u SelectedValueChanged，因为我在其中编写了一些代码。下面给出了错误

未为类型“DataRowView”和类型“Integer”定义运算符

您需要签入cboarea\u SelectedValueChanged i、 e

Private Sub cboarea_SelectedValueChanged(ByVal sender As Object, ByVal e As 
                             System.EventArgs) Handles cboarea.SelectedValueChanged

    Dim item As DataRowView = TryCast(Me.cboarea.SelectedItem, DataRowView)    
    If item.IsEdit = False Then'check whether the cboarea is in edit mode (on load)
       'here your some piece of code
    End If
End Sub