PagedDataSource给repeater分页

DataTable dt = dbObject.BothEnExamCenter.FromSql(sql.ToString()).ToTable();

int cup = this.drpCurrentPageIndex.SelectedValue == "" ? 1 : Convert.ToInt32(this.drpCurrentPageIndex.SelectedValue);

PagedDataSource objPage = new PagedDataSource();

objPage.DataSource = dt.DefaultView;

objPage.AllowPaging = true;

objPage.PageSize = Convert.ToInt32(drpCount.SelectedValue);

objPage.CurrentPageIndex = cup - 1;

ViewState["PageCount"] = objPage.PageCount;

lbPageCount.Text = "一共" + ViewState["PageCount"] + "页"; 

//绑定当前页

if (!IsPostBack)

            {    //drpCurrentPageIndex.Items.Clear();

　　　　 for (int i = 1; i < Convert.ToInt32(ViewState["PageCount"]) + 1; i++) 

　　　　  {    this.drpCurrentPageIndex.Items.Add(i.ToString());

                }  

  }           

  else             {  

               //drpCurrentPageIndex.SelectedIndex = -1;      

           drpCurrentPageIndex.Items.Clear();        

         for (int i = 1; i < Convert.ToInt32(ViewState["PageCount"]) + 1; i++)                 {     

                this.drpCurrentPageIndex.Items.Add(i.ToString());        

         }       

      }       

      drpCurrentPageIndex.SelectedValue = cup.ToString();     

        rpQuestionLine.DataSource = objPage;    

         rpQuestionLine.DataBind();

 protected void LinkUp_Click(object sender, EventArgs e)   

      {             if (Convert.ToInt32(drpCurrentPageIndex.SelectedValue) > 1)             {

                drpCurrentPageIndex.SelectedValue = (Convert.ToInt32(drpCurrentPageIndex.SelectedValue) - 1).ToString();                 BindrpQuestionLine();             }             else             {                 PublicObject.PageHelper.Alert(this, "已经第一页");

            }         }

 protected void LinkDown_Click(object sender, EventArgs e)         {             if (Convert.ToInt32(drpCurrentPageIndex.SelectedValue) < Convert.ToInt32(ViewState["PageCount"]))             {                 drpCurrentPageIndex.SelectedValue = (Convert.ToInt32(drpCurrentPageIndex.SelectedValue) + 1).ToString();                 BindrpQuestionLine();             }             else             {                 PublicObject.PageHelper.Alert(this, "已经到了最后一页");             }         }

 protected void drpCurrentPageIndex_SelectedIndexChanged(object sender, EventArgs e)         {             int page = Convert.ToInt32((drpCurrentPageIndex.SelectedItem.Value));             BindrpQuestionLine();         }

 protected void LinkFirst_Click(object sender, EventArgs e)         {             this.drpCurrentPageIndex.SelectedValue = "1";             BindrpQuestionLine();         }

 protected void LinkLast_Click(object sender, EventArgs e)         {             this.drpCurrentPageIndex.SelectedValue = ViewState["PageCount"].ToString();             BindrpQuestionLine();         }

protected void drpCount_SelectedIndexChanged(object sender, EventArgs e)         {             this.drpCurrentPageIndex.SelectedValue = "1";             BindrpQuestionLine();         }