C# asp.net vb无法在datagrid中删除

我有datagrid和delete按钮 在web应用程序中 但是不要在这个btton工作 这是片段数据网格

asp:DataGrid  OnItemCommand="Click_Grid"
runat="server" 
Columns  <asp:ButtonColumn
HeaderText="Silmek Ucun Linke Toxunun"
ButtonType="LinkButton"
Text="Sil"
CommandName="cmdRemoveItem"
Columns
asp:DataGrid

---

这是我的错在哪里？是的。。。它在哪里？这是greg buczek书中的脚本，但我的错误在哪里？我不知道。你确定你会在第4单元中获得ShoppingCartItemID。请调试并确保获得正确的删除id。

Protected Sub Click_Grid(ByVal Sender As Object, ByVal E As DataGridCommandEventArgs)
Dim DBConn As SqlConnection
Dim DBDelete As New SqlCommand
Dim DBCommand As SqlDataAdapter
Dim DSPageData As New DataSet
DBConn = New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\HP\Documents\Visual Studio 2010\Projects\emagazin\emagazin\App_Data\emagaza.mdf;Integrated Security=True;User Instance=True")
DBDelete.CommandText = "Delete from ShoppingCartItems " _
    & "Where ShoppingCartItemID = " _& E.Item.Cells(4).Text