极度困惑，下面的程序怎么会是这样的结果？！
一个以DataGrid显示邮票品种的ASP.net页面，在DataGrid中以一个HyperlinkColumn来用一个链接删除某个品种（将状态置为无效）：
<%@   Page   Language=C#   Trace=false   %>
<%@   Import   Namespace= "System.Data "   %>
<%@   Import   Namespace= "System.Data.OleDb "   %>
<Script   language= "C# "   runat= "server ">
public   void   Page_Load(Object   sender,   EventArgs   e){
if   (!Page.IsPostBack){
BindGrid();
}
}

public   void   DBItemEdit(Object   sender,DataGridCommandEventArgs   e){
DBGrid.EditItemIndex=e.Item.ItemIndex;
BindGrid();
}

public   void   DBItemCancel(object   sender,DataGridCommandEventArgs   e){
DBGrid.EditItemIndex=-1;
BindGrid();
}

public   void   DBItemUpdate(object   sender,DataGridCommandEventArgs   e){
string   StrStampNO   =e.Item.Cells[0].Text;
string   CnnString= "Provider=Microsoft.Jet.OLEDB.4.0;Data   Source= "+Server.MapPath( "Stamp.MDB ");  
OleDbConnection   cnn   =   new   OleDbConnection(CnnString);  
StringBuilder   Sb=new   StringBuilder( "Select   *   from   Stamp   Where   State=1   and   StampNO= ");
Sb.Append(StrStampNO);

DataSet   Ds=new   DataSet();
OleDbDataAdapter   Adapter=new   OleDbDataAdapter(Sb.ToString(),cnn);
OleDbCommandBuilder   Cb=new   OleDbCommandBuilder(Adapter);
Adapter.Fill(Ds, "Stamp ");
DataRow   Dr=Ds.Tables[ "Stamp "].Rows[0];

TextBox   txtModStampName=(TextBox)e.Item.Cells[1].Controls[0];
TextBox   txtModAmount=(TextBox)e.Item.Cells[2].Controls[0];
TextBox   txtModStampClassID=(TextBox)e.Item.Cells[3].Controls[0];

Dr[ "StampName "]=txtModStampName.Text;
Dr[ "Amount "]=txtModAmount.Text;
Dr[ "StampClassID "]=txtModStampClassID.Text;
Adapter.Update(Ds, "Stamp ");

DBGrid.EditItemIndex=-1;
BindGrid();
}

public   void   BindGrid(){
string   CnnString= "Provider=Microsoft.Jet.OLEDB.4.0;Data   Source= "+Server.MapPath( "Stamp.MDB ");  
OleDbConnection   cnn   =   new   OleDbConnection(CnnString);  
StringBuilder   Sb=new   StringBuilder( "select   *   from   Stamp   Where   State=1   order   by   StampClassID ");
OleDbDataAdapter   Da=new   OleDbDataAdapter(Sb.ToString(),cnn);

DataSet   Ds=new   DataSet();
cnn.Open();
Da.Fill(Ds, "ResTable ");
DBGrid.DataSource=Ds.Tables[ "ResTable "].DefaultView;
DBGrid.DataBind();
cnn.Close();

lblMsg.Text= " ";
}


public   void   BtnAddNew_Click(object   sender,   EventArgs   e){
string   CnnString= "Provider=Microsoft.Jet.OLEDB.4.0;Data   Source= "+Server.MapPath( "Stamp.MDB ");  
OleDbConnection   cnn   =   new   OleDbConnection(CnnString);  
string   StrSql= "Select   *   from   Stamp ";
DataSet   Ds=new   DataSet();
OleDbDataAdapter   Adapter=new   OleDbDataAdapter(StrSql,cnn);
OleDbCommandBuilder   Cb=new   OleDbCommandBuilde