datalist分页

自己写了个datalist的分页 先暂时放这里 有的地方还要修改  呵呵

static int pagecount;
static int pagesize=9;
static int currentpage;
private void GetData()
    {
        DataTable dt = new DataTable();
        SqlConnection con = new SqlConnection(str);
        SqlDataAdapter da = new SqlDataAdapter("select * from authors",con);
        try
        {
            da.Fill(dt);
            if (dt != null && dt.Rows.Count != 0)
            {
                Session["dt"] = dt;
                DataTable newtb = new DataTable();
                DataColumn col1 = new DataColumn("au_id");
                DataColumn col2 = new DataColumn("au_lname");
                newtb.Columns.Add(col1);
                newtb.Columns.Add(col2);

                for (int i = 0; i < pagesize; i++)
                {
                    DataRow row = newtb.NewRow();
                    row[0] = dt.Rows[i][0];
                    row[1] = dt.Rows[i][1];
                    newtb.Rows.Add(row);
                }
                DlTest.RepeatColumns = 3;
                DlTest.DataSource = newtb;
                DlTest.DataBind();
                pagecount = dt.Rows.Count / pagesize;
                if (pagecount > 1)
                {
                    currentpage = 1;
                    LinkLastPage.Visible = true;
                    LinkNextPage.Visible = true;
                }
            }
        }
        catch
        { 
            
        }
    }
    private void getPageData(int cpage)
    {
        DataTable tb = new DataTable();
        tb = (DataTable)Session["dt"];
        DataTable newtb = new DataTable();
        DataColumn col1 = new DataColumn("au_id");
        DataColumn col2 = new DataColumn("au_lname");
        newtb.Columns.Add(col1);
        newtb.Columns.Add(col2);
        for (int i = (cpage-1)*pagesize+1; i <= cpage * pagesize; i++)
        {
            DataRow row = newtb.NewRow();
            row[0] = tb.Rows[i][0];
            row[1] = tb.Rows[i][1];
            newtb.Rows.Add(row);
        }
        DlTest.RepeatColumns = 3;
        DlTest.DataSource = newtb;
        DlTest.DataBind();
    }

    protected void LinkLastPage_Click(object sender, EventArgs e)
    {
        currentpage -= 1;
        if (currentpage < 1)
        {
            Response.Write("<script language='javascript'>alert('已是最前一页了!');</script>");
            currentpage = 1;
            return;
        }
        getPageData(currentpage);
    }
    protected void LinkNextPage_Click(object sender, EventArgs e)
    {
        currentpage+=1;
        if (currentpage > pagecount)
        {
            Response.Write("<script language='javascript'>alert('已是最后一页了!');</script>");
            currentpage = pagecount;
            return;
        }
        getPageData(currentpage);
    }