paging in gridview using c#

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C#

how to set paging in gridview using c#?
this is my code:

protected void fnBindEvent()
        {
            HttpResponseMessage response = objCRUD.Get("api/Event");  // Blocking call!
            if (response.IsSuccessStatusCode)
            {
                var getevents = response.Content.ReadAsAsync<list><eventmodel>>().Result;
                if (getevents.Count > 0)
                {
                    grdEvent.DataSource = getevents;
                    grdEvent.DataBind();
                    //Session["CompleteTable"] = getevents;
                    
                    PagedDataSource pgitems = new PagedDataSource();
                    pgitems.DataSource = getevents;
                    pgitems.AllowPaging = true;
                    pgitems.PageSize = Convert.ToInt32(ConfigurationManager.AppSettings["PageSize"]);
                    pgitems.CurrentPageIndex = Convert.ToInt32(ViewState["currentPageIndex"]);
                    int IntPazeSize = pgitems.PageSize;
                    int rowCount = getevents.Count;
                    int intTotalPage = rowCount / IntPazeSize;
                   // ViewState["MaxPageIndex"] = (getevents.Count / IntPazeSize);
                    if ((rowCount % IntPazeSize) != 0)
                    {
                        intTotalPage = intTotalPage + 1;
                    }

                    lblTotPage2.Text = intTotalPage.ToString();
                    lblTotPage.Text = getevents.Count.ToString();

                    lblfromPage.Text = System.Convert.ToString((System.Convert.ToInt32(ViewState["currentPageIndex"]) * IntPazeSize) + 1);
                    lblTopage.Text = System.Convert.ToString((System.Convert.ToInt32(ViewState["currentPageIndex"]) + 1) * IntPazeSize);
                    if (System.Convert.ToInt32(ViewState["currentPageIndex"]) == System.Convert.ToInt32(lblTotPage2.Text) - 1)
                    {
                        lblTopage.Text = Convert.ToString(getevents.Count);
                    }
                    txtPageNumber.Value = Convert.ToString(Convert.ToInt32(ViewState["currentPageIndex"]) + 1);
                    grdEvent.PageIndex = Convert.ToInt32(ViewState["currentPageIndex"]);
                    
                }
            }
        }

but i get all the rows together...how to do this?please help me