一个应该注意的问题

public class outstorage : System.Web.UI.Page
    ...{
        public string conn =Bill.Biz.DataBase.GetConnectionString("bill");
        protected int PageSize = 20;
        protected int page;
        protected int itemCount;
        protected int totalPage;
        protected int adid;
        protected int userid;
        protected System.Web.UI.WebControls.Button newAdd;
        protected System.Web.UI.WebControls.DropDownList ddlName;
        protected System.Web.UI.WebControls.TextBox txtTitle;
        protected System.Web.UI.WebControls.Button btnSearch;
        protected System.Web.UI.WebControls.DataGrid Datagrid1;
        protected System.Web.UI.WebControls.DropDownList ddrPageNum;
        protected System.Web.UI.WebControls.Label lblPageInfo;
        protected System.Web.UI.WebControls.Button btnFirstPage;
        protected System.Web.UI.WebControls.Button btnPriPage;
        protected System.Web.UI.WebControls.Button btnNextPage;
        protected System.Web.UI.WebControls.Button btnLastPage;
        protected System.Web.UI.WebControls.TextBox tbxPage;
        protected System.Web.UI.WebControls.Button btnGo;
        protected System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidator1;
        protected System.Web.UI.WebControls.Panel Panel1;
        protected string condition = " 1=1 ";
        private void Page_Load(object sender, System.EventArgs e)
        ...{
            Bill.Biz.AgentAuth.Check();
            userid =Convert.ToInt32(Session[Bill.Biz.AgentAuth.Session_Agent_Userid]);

            itemCount = getCount();
            if (itemCount==0)
            ...{
                totalPage = 1;
            }
            else
            ...{
                totalPage = itemCount%PageSize>0 ? itemCount/PageSize+1 : itemCount/PageSize;
            }
            if(!IsPostBack)
            ...{
                ReadRecords();
            }
        }
        public void Datagrid1_Edit(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        ...{
            this.Datagrid1.EditItemIndex = e.Item.ItemIndex;

            this.Datagrid1.DataBind();
            ReadRecords();

            
        }
        private void getStrCondition()
        ...{
            if(txtTitle.Text.Trim() != "")
            ...{
                if(this.ddlName.SelectedValue=="0")
                ...{
                    condition += string.Format("and outstorage_name like '%{0}%'",txtTitle.Text.Trim().Replace("'","''"));
                }
                if(this.ddlName.SelectedValue=="1")
                ...{
                    condition += string.Format("and outstorage_class like '%{0}%'",txtTitle.Text.Trim().Replace("'","''"));
                }
            }

        }
        private int getCount()
        ...{
            getStrCondition();

            if(ViewState["itemCount"] == null || ViewState["keyword"].ToString() != this.condition)
            ...{
                ViewState["keyword"] = this.condition;
                string sql = string.Format("select  count(*) from outstorage   WHERE {0} ",condition);
                
                int count = Convert.ToInt32(Bill.Biz.SqlHelper.ExecuteScalar(sql,conn));
                ViewState["itemCount"] = count;
            }
            return Bill.Biz.Util.ToIntSafe(ViewState["itemCount"],0);
        }
        private void ReadRecords()
        ...{
            PageSize =Convert.ToInt32(this.ddrPageNum.SelectedItem.Text);
            if(ViewState["page"] == null || Convert.ToInt32(ViewState["page"]) < 1 )
            ...{
                ViewState["page"] = 1;
            }
            else if(Convert.ToInt32(ViewState["page"]) > totalPage)
            ...{
                ViewState["page"] = totalPage;
            }
            page = Convert.ToInt32(ViewState["page"]);
            tbxPage.Text = page.ToString();
            lblPageInfo.Text ="共"+ itemCount.ToString() + "项 &nbsp;" + page.ToString()+"/"+totalPage.ToString()+"页";
            btnNextPage.Enabled = true;
            btnLastPage.Enabled = true;
            btnFirstPage.Enabled = true;
            btnPriPage.Enabled = true;
            if (itemCount<=PageSize || page * PageSize >= itemCount)
            ...{
                btnNextPage.Enabled = false;
                btnLastPage.Enabled = false;
            }
            if(page == 1)
            ...{
                btnFirstPage.Enabled = false;
                btnPriPage.Enabled = false;
            }
            string sqlStr;
            
            sqlStr = string.Format(@"select top {0} * from outstorage where outstorage_id<=(select min(aa.outstorage_id) from (select top {1} outstorage_id from outstorage where {2} order by outstorage_id desc) aa) and {2} order by outstorage_id desc",PageSize,PageSize*page-PageSize+1,condition);    
            
            DataTable dt =Bill.Biz.SqlHelper.ExecuteDataset(sqlStr,conn).Tables[0];
            dt.Columns.Add("newproduct_title");
            dt.Columns.Add("newproduct_in");
            dt.Columns.Add("newproduct_out");
            foreach(DataRow dr in dt.Rows)
            ...{
                
                if(dr["outstorage_name"].ToString().Length >= 24)
                ...{
                    dr["newproduct_title"] ="<a href='add_store.aspx?store_id="+dr["outstorage_id"].ToString()+"'  title='"+dr["outstorage_name"].ToString()+"' >"+dr["outstorage_name"].ToString().Substring(0,23)+"</a>";
                }
                else
                ...{
                    dr["newproduct_title"] ="<a href='add_store.aspx?store_id="+dr["outstorage_id"].ToString()+"' title='"+dr["outstorage_name"].ToString()+"' >"+dr["outstorage_name"].ToString()+"</a>";
                }
                

            }
            this.Datagrid1.DataSource = dt;
            this.Datagrid1.DataBind();
        }

        public void Datagrid1_Update(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        ...{
            //string key =((TextBox)e.Item.FindControl("product_id")).Text;

            string key =this.Datagrid1.DataKeys[e.Item.ItemIndex].ToString();
            string   outstorageclass   =   ((TextBox)e.Item.FindControl("outstorage_class")).Text;
            string   outstoragenum   =   ((TextBox)e.Item.FindControl("outstorage_num")).Text;
            string   outstoragebeizhu  =   ((TextBox)e.Item.FindControl("outstorage_beizhu")).Text;
            string sql="";
            sql=string.Format("update outstorage set outstorage_class ='{0}',outstorage_num='{1}',outstorage_beizhu='{2}' where outstorage_id='{3}'",outstorageclass,outstoragenum,outstoragebeizhu,key);
            SqlConnection constr = new SqlConnection(conn);
            SqlCommand myCommand = new SqlCommand(sql,constr);
            myCommand.Connection.Open();
            if(this.userid.ToString() =="1" || this.userid.ToString()=="2")
            ...{
                try
                ...{
                    myCommand.ExecuteNonQuery();
                
                }
                catch(SqlException)
                ...{

                }
                myCommand.Connection.Close();
                this.Datagrid1.EditItemIndex = -1;
                ReadRecords();
            }
            else
            ...{
                Response.Write("<script language=javascript>alert('出错啦！请联系系统管理员','','')</script>");
            }
        }

        public void Datagrid1_Delete(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        ...{
            
        }

        public void Datagrid1_Cancel(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        ...{
            this.Datagrid1.EditItemIndex=-1;
            ReadRecords();
        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        ...{
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        ...{    
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }

 public class outstorage : System.Web.UI.Page

函数名称要和html页面的名称相同，否则会引起应用服务器错误！！！