DataGrid在分页状态下删除纪录的问题

 //检索数据库的函数
   public DataSet GetZcbd()
   {
    try
    {
     DataSet ds=new DataSet();   
     string searchString="select id,yy,bj from zc";
     da=new OleDbDataAdapter(searchString,conn);
     da.Fill(ds,"yy");    
     return ds;
    }
    catch
    {
     return null;    
    }  
 
   }
 
 //绑定DataGrid   
 private void BindGrid()
   {
    DataSet ds = new DataSet();
    ds = us.GetZcbd();
    if (ds!=null)
    {
     this.DataGrid1.DataSource = ds;
     this.DataGrid1.DataBind();
    }
    else
    {
     msg.Alert("加载数据错误！",Page);
    }
   }

 //删除数据库纪录函数
   public string DeleteZcbd(int bdID)
   {
   int count = this.IfExiseZysx(bdID);//不必理会次句，默认count=1
    if (count <= 0) return "false";
    else
    {
     string sqlStr = "delete from zcwhere id="+bdID;
     OleDbCommand cmd = new OleDbCommand(sqlStr,conn);
    conn.Open();
    try
     {
      cmd.ExecuteNonQuery();
      return "true";
     }
     catch(Exception e)
     {
      return e.Message.ToString();
     }
     finally
     {
      conn.Close();
     }      
    }
   }
 
// DataGrid1_DeleteCommand事件修改函数  
 private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
   {
    int bdID = int.Parse(DataGrid1.DataKeys[(int)e.Item.ItemIndex].ToString());
    string isDel = us.DeleteZcbd(bdID);
    int CurrentPage = 0;
    if (isDel == "true")
    {
     if(this.DataGrid1.CurrentPageIndex == this.DataGrid1.PageCount -1)
     {
    if (this.DataGrid1.CurrentPageIndex == 0)
     {
      this.DataGrid1.CurrentPageIndex = this.DataGrid1.PageCount -1;
     }
     else
     {
      if (this.DataGrid1.Items.Count % this.DataGrid1.PageSize == 1)
      {
       CurrentPage = 2;
      }
      else
      {
       CurrentPage = 1;
      }
      this.DataGrid1.CurrentPageIndex = this.DataGrid1.PageCount - CurrentPage;
     }
    }
     this.BindGrid();
    }
    else
    {
        msg.Alert("删除数据错误！",Page);
    }
 
   }
     注释：msg为一个类似WinForm的messagebox对话框，不必理会。可以使用label.Text代替