This example shows how jqGrid deals with paging, sorting and filtering with 1,000,000 rows of data.

Sometimes it is not possible to always use the codeless Linq / LinqDataSource support for large amount of data that jqGrid supports. In this case, you can manually intercept grid request and craft your SQL request carefully, so that only the data you need is fetched from the database server to jqGrid.

The key here is the DataRequesting event. If you have not associate any DataSource/DataSourceID with the grid, the DataRequesting event fires and you can manually bind the grid based on the current page, sort and search filters.

Please, review the C# tab for implementation details and note how fast the grid deals with 1,000,000 rows
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="JQSuiteASPNETExample.examples.loading_data.million_sql._default" %>
<%@ Register Assembly="Trirand.Web" TagPrefix="trirand" Namespace="Trirand.Web.UI.WebControls" %>

<!DOCTYPE html>
<html lang="en-us">
<head id="Head1" runat="server">
    <meta charset="utf-8">
    <title>jqGrid for ASP.NET WebForms - million rows of data from SQL</title>
    <!-- The jQuery UI theme that will be used by the grid -->
    <link rel="stylesheet" type="text/css" media="screen" href="http://code.jquery.com/ui/1.12.1/themes/redmond/jquery-ui.css" />
    <!-- The jQuery UI theme extension jqGrid needs -->
    <link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqgrid.css" />
    <!-- jQuery runtime minified -->
    <script src="/js/jquery-3.2.1.min.js" type="text/javascript"></script>
    <!-- The localization file we need, English in this case -->
    <script src="/js/trirand/i18n/grid.locale-en.js" type="text/javascript"></script>
    <!-- The jqGrid client-side javascript -->
    <script src="/js/trirand/jquery.jqGrid.min.js" type="text/javascript"></script>    
    
    <style type="text/css">    
        body, html { font-size: 80%; }    
    </style>
</head>
<body>
    <form id="form1" runat="server">    
        
    <trirand:JQGrid runat="server" ID="JQGrid2" Width="680px" OnDataRequesting="JQGrid2_DataRequesting" OnSearching="JQGrid2_Searching">
        <Columns>
            <trirand:JQGridColumn DataField="OrderID" Width="50" Searchable="false"  />
            <trirand:JQGridColumn DataField="OrderDate" DataFormatString="{0:d}" Width="100" Searchable="false" />
            <trirand:JQGridColumn DataField="CustomerID" Width="100" Searchable="true" SearchControlID="CustomerIDDdl" SearchType="DropDown"
                        SearchToolBarOperation="IsEqualTo" DataType="String" />            
            <trirand:JQGridColumn DataField="Freight" Width="75" Searchable="true" 
                        SearchToolBarOperation="IsGreaterOrEqualTo" SearchValues="[All]:[All];10:> 10;20:> 20;50:> 50;100:> 100"  
                        SearchType="DropDown" DataType="Decimal"/>
            <trirand:JQGridColumn DataField="ShipName" Searchable="true" SearchToolBarOperation="Contains" DataType="String" />
        </Columns>        
        <PagerSettings PageSize="10" PageSizeOptions="[10,20,50]" />        
        <ToolBarSettings ShowSearchToolBar="true" ShowSearchButton="true" ShowRefreshButton="true" />        
    </trirand:JQGrid>   

    
    <asp:SqlDataSource runat="server" ID="SqlDataSource2" 
        ConnectionString="<%$ ConnectionStrings:SQL2008_661086_trirandEntities %>"                 
        SelectCommand="SELECT DISTINCT [CustomerID] FROM [OrdersLarge]">
    </asp:SqlDataSource>

    <asp:DropDownList runat="server" ID="CustomerIDDdl" DataSourceID="SqlDataSource2"
            DataTextField="CustomerID" 
            DataValueField="CustomerID" 
            AppendDataBoundItems="true">        
        <asp:ListItem Text="[All]" Value="[All]"></asp:ListItem>
    </asp:DropDownList>    
    
    
    <br /><br />
    
    <asp:RadioButtonList runat="server" ID="ExportType" 
        style="font-size: 125%; font-family: Tahoma;" >        
        <asp:ListItem Text="Export All Data" Value="1"></asp:ListItem>
        <asp:ListItem Text="Export Only Filtered Data" Value="2"></asp:ListItem>
        <asp:ListItem Text="Export Only Filtered & Paged Data" Value="3"></asp:ListItem>
    </asp:RadioButtonList>
    
    <br /><br />        
    <asp:Button runat="server" ID="ExportToExcelButton" Text="Export to Excel" OnClick="ExportToExcelButton_Click" />
    
    <br /><br />
    <trirand:codetabs runat="server" id="tabs"></trirand:codetabs>  
        
    </form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using Trirand.Web.UI.WebControls;

namespace JQSuiteASPNETExample.examples.loading_data.million_sql
{
    public partial class _default : System.Web.UI.Page
    {
        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);            
        }

        public void JQGrid2_Searching(object sender, Trirand.Web.UI.WebControls.JQGridSearchEventArgs e)
        {
            if (e.SearchString == "[All]")
                e.Cancel = true;
        }

        public void JQGrid2_DataRequesting(object sender, Trirand.Web.UI.WebControls.JQGridDataRequestEventArgs e)
        {
            string orderByColumn;
            if (!String.IsNullOrEmpty(e.SortExpression))
                orderByColumn = e.SortExpression + " " + e.SortDirection.ToString();
            else
                orderByColumn = "OrderID ASC";
            e.TotalRows = GetRowCount(orderByColumn, e.SearchExpression);

            DataTable dt = GetData(JQGrid2.PagerSettings.PageSize,
                                    (e.NewPageIndex - 1) * JQGrid2.PagerSettings.PageSize,
                                    orderByColumn,
                                    e.SearchExpression);

            JQGrid2.DataSource = dt;
            JQGrid2.DataBind();
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (JQGrid2.AjaxCallBackMode != AjaxCallBackMode.None)
            {
                // save the last grid state in session - to be used for exporting
                Session["gridFilterPageState"] = JQGrid2.GetState();
            }
        }

        

        protected DataTable GetData(int pageSize, int startIndex, string orderByColumn, string searchExpression)
        {
            // Create a new Sql Connection and set connection string accordingly
            SqlConnection sqlConnection = new SqlConnection();
            sqlConnection.ConnectionString = ConfigurationManager.ConnectionStrings["SQL2008_661086_trirandEntities"].ConnectionString;
            sqlConnection.Open();
            
            string sql = @"
                            SELECT * FROM 
                            (
    		                    SELECT row_number() OVER 
                                    ({0})
                                AS 
    			                    rownum, OrderID, CustomerID, OrderDate, Freight, ShipName
		                        FROM 
                                    OrdersLarge
		                            {1} 
                            )
	                        AS A
	                        WHERE A.rownum BETWEEN {2} AND {3}";

            string orderClause = String.IsNullOrEmpty(orderByColumn) ? String.Empty : "ORDER BY " + orderByColumn;
            string whereClause = String.IsNullOrEmpty(searchExpression) ? String.Empty : "WHERE " + searchExpression;
            
            sql = String.Format(sql, orderClause, whereClause, startIndex + 1, startIndex + pageSize);

            SqlCommand cmd = new SqlCommand(sql, sqlConnection);            

            // Create a SqlDataAdapter to get the results as DataTable
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);

            // Create a new DataTable
            DataTable dtResult = new DataTable();

            // Fill the DataTable with the result of the SQL statement
            sqlDataAdapter.Fill(dtResult);

            sqlConnection.Close();

            return dtResult;
        }

        protected int GetRowCount(string orderByColumn, string searchExpression)
        {
            // Create a new Sql Connection and set connection string accordingly
            SqlConnection sqlConnection = new SqlConnection();
            sqlConnection.ConnectionString = ConfigurationManager.ConnectionStrings["SQL2008_661086_trirandEntities"].ConnectionString;
            sqlConnection.Open();

            string sql = @"
                            SELECT COUNT(*) FROM 
                            (
    		                    SELECT row_number() OVER 
                                    ({0})
                                AS 
    			                    rownum, OrderID, CustomerID, OrderDate, Freight, ShipName
		                        FROM 
                                    OrdersLarge
		                            {1} 
                            ) AS A";
	                        

            string orderClause = String.IsNullOrEmpty(orderByColumn) ? String.Empty : " ORDER BY " + orderByColumn;
            string whereClause = String.IsNullOrEmpty(searchExpression) ? String.Empty : " WHERE " + searchExpression;

            sql = String.Format(sql, orderClause, whereClause);


            SqlCommand cmd = new SqlCommand(sql, sqlConnection);
            int count = (int) cmd.ExecuteScalar();

            sqlConnection.Close();

            return count;
        }

        protected void ExportToExcelButton_Click(object sender, EventArgs e)
        {
            JQGridState gridState = Session["gridFilterPageState"] as JQGridState;
            switch (ExportType.SelectedValue)
            {
                case "1":
                    JQGrid2.ExportSettings.ExportDataRange = ExportDataRange.All;
                    JQGrid2.ExportToExcel("export.xls");
                    break;
                case "2":
                    JQGrid2.ExportSettings.ExportDataRange = ExportDataRange.Filtered;
                    JQGrid2.ExportToExcel("export.xls", gridState);
                    break;
                case "3":
                    JQGrid2.ExportSettings.ExportDataRange = ExportDataRange.FilteredAndPaged;
                    JQGrid2.ExportToExcel("export.xls", gridState);
                    break;
            }
        }
    }
}
Switch theme:


Theming is based on the very popular jQuery ThemeRoller standard. This is the same theming mechanism used by jQuery UI and is now a de-facto standard for jQuery based components. The benefits of using ThemeRoller are huge. We can offer a big set of ready to use themes created by professional designers, including Windows-like themes (Redmond), Apple-like theme (Cupertino), etc. In addition to that any jQuery UI controls on the same page will pick the same theme.

Last, but not least, you can always roll your own ThemeRoller theme, using the superb Theme Editor

To use a theme, simply reference 2 Css files in your Html <head> section - the ThemeRoller theme you wish to use, and the jqGrid own ThemeRoller Css file. For example (Redmond theme):

<link rel="stylesheet" type="text/css" media="screen" href="/themes/redmond/jquery-ui-1.8.2.custom.css" />
<link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqgrid.css" />