move data from repeater control in next previous button click

    public int CurrentPage
    {
        get
        {
            //get current page number
            object obj = this.ViewState["_CurrentPage"];

            if (obj == null)
            {
                return 0;
            }
            else
            {
                return (int)obj;
            }
        }
        set
        {
            //set in viewstate the current page number
            this.ViewState["_CurrentPage"] = value;
        }
    }



protected void imgNextlist_Click(object sender, ImageClickEventArgs e)
    {
        //go to next page
        CurrentPage += 1;
        DataTable dv = new DataTable();
        dv = (DataTable)ViewState["dt"];

        GetItems(dv);
    }
    protected void imgPrelist_Click(object sender, ImageClickEventArgs e)
    {
        //back to previous page
        CurrentPage -= 1;
        DataTable dv = new DataTable();
        dv = (DataTable)ViewState["dt"];

        GetItems(dv);
    }


//In Loading method of Repeater write like this,-


PagedDataSource objPds = new PagedDataSource();

        //set number of pages will appear ddlSort
        // objPds.PageSize = 3;
        objPds.PageSize = int.Parse(ddlSort.SelectedValue.ToString());
        objPds.DataSource = dv.DefaultView;
        objPds.AllowPaging = true;
        int count = objPds.PageCount;


        objPds.CurrentPageIndex = CurrentPage;

 RptShowData.DataSource = objPds;
        RptShowData.DataBind();