Paging in datalist in asp.net

namespace PagininDataLista
{
    public partial class Display_question : System.Web.UI.Page
    {
        string ansid;
        string querystr;
        SqlDataAdapter dadapter;
        DataSet dset;
        PagedDataSource adsource;
        string connstring = "Data Source = USER-PC\\SQLEXPRESS; Initial Catalog = medicalvoyager; Integrated Security = true";
        int pos;
        SqlConnection con = new SqlConnection("Data Source = USER-PC\\SQLEXPRESS; Initial Catalog = medicalvoyager; Integrated Security = true");
        protected void Page_Load(object sender, EventArgs e)
        {
            querystr = Request.QueryString["Question"];
            call1();
            if (!IsPostBack)
            {
                ViewState["vs"] = pos;
            }
           pos = (int)this.ViewState["vs"];
            databind();
           

        }
        public void databind()
        {
            try
            {
                if (querystr.ToString() == "")
                {
                    Response.Redirect("Forum.aspx");
                }
                else
                {
                    dadapter = new SqlDataAdapter("select * from forum_answers where Questionid = @questionid", connstring);
                    dadapter.SelectCommand.Parameters.AddWithValue("@questionid", querystr);
                    dset = new DataSet();
                    adsource = new PagedDataSource();
                    dadapter.Fill(dset);
                    adsource.DataSource = dset.Tables[0].DefaultView;
                    adsource.PageSize = 7;
                    adsource.AllowPaging = true;
                    adsource.CurrentPageIndex = pos;
                    btnfirst.Enabled = !adsource.IsFirstPage;
                    btnprevious.Enabled = !adsource.IsFirstPage;
                    btnlast.Enabled = !adsource.IsLastPage;
                    btnnext.Enabled = !adsource.IsLastPage;
                    Datalist1.DataSource = adsource;
                    Datalist1.DataBind();
                }
            }
       
        catch(Exception ex)
         {
             Response.Write(ex.ToString());
       Response.Redirect("Error_Page.aspx");

         }

        }

<asp:DataList ID="DataList1" runat="server" RepeatDirection="Horizontal" RepeatColumns="5" EnableViewState="true" Width="88%">
  <itemtemplate>Xyz </itemtemplate>
    

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString='<%$ ConnectionStrings:ConnString %>'SelectCommand="SELECT x,y,z ...">
         
                    <tr>
                        <td>
                              <asp:Label ID="lblCurrentPage" runat="server" Visible="true">
                        </td>
                    </tr>
                    <tr>
                        <td align="center">
                              <asp:Button ID="cmdPrev" runat="server" Text=" << " OnClick="cmdPrev_Click">
                            
                             <asp:Button ID="cmdNext" runat="server" Text=" >> " OnClick="cmdNext_Click">
                            
                        </td>
                    </tr>

 protected void items()
    {
        PagedDataSource objDs = new PagedDataSource();
        DataView dv = (DataView)SqlDataSource1.Select(DataSourceSelectArguments.Empty);
        objDs.DataSource = dv;
        objDs.AllowPaging = true;
        objDs.PageSize = 20;
        objDs.CurrentPageIndex = CurrentPage;
        lblCurrentPage.Text = "Page:" + (CurrentPage + 1).ToString() + " Of " + objDs.PageCount.ToString();
        cmdPrev.Enabled = !objDs.IsFirstPage;
        cmdNext.Enabled = !objDs.IsLastPage;
        DataList1.DataSource = objDs;
       DataList1.DataBind();
 
    }
 

protected void cmdPrev_Click(object sender, EventArgs e)
    {
        try
        {
            CurrentPage -= 1;
            items();
        }
        catch (Exception ex)
        {
            Logger.LogException(ex);
        }
    }
 
    protected void cmdNext_Click(object sender, EventArgs e)
    {
        try
        {
 
            CurrentPage += 1;
            items();
        }
        catch (Exception ex)
        {
            Logger.LogException(ex);
        }
    }

AllowPaging="True" PageSize="5"  AllowSorting="true"


protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            GridView1.PageIndex = e.NewPageIndex;
            FillGrid();

        }