Find List view control

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ASP.NET

hi
I've to edit listview on button click and then update too.
my code generating an error...."Object reference not set to an instance of an object."
my code is as follows.....

Protected Sub btnedit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnedit.Click
Dim currentID As Integer
        Dim dblAmount1 As Integer
        Dim dblAmount2 As Integer
  Dim myAdapter As spGetFeeStructureTableAdapter
For Each item As ListViewDataItem In lvFeeStructure.Items
           currentID = lvFeeStructure.DataKeys(item.DataItemIndex).Value
           intGradeID = CType(ddlGrades.SelectedValue, Integer)
           If (item.ItemType = ListViewItemType.DataItem) Then
           dblAmount1 = Val(CType(item.FindControl "decMonth1TextBox"), TextBox).Text)
                dblAmount2 = Val(CType(item.FindControl("decMonth2TextBox "), TextBox).Text)
myAdapter.UpdateFeeStructure("CurrentID", intGradeID,dblAmount1 ,dblAmount2)
lvFeeStructure.DataBind()

End Sub

Please help me out.

How to find ListView Control without using listView control??

Thank You
Pooja Thakur