qGrid can save its current state (current page, filter, sorted position, etc) in local storage and then at any point later, even after the user has changed the state of the grid by interacting with it, restore it back to the lasst saved state. The syntax is a bit weird, but still easy to achieve on the client-side with javascript:

Save state:
$.jgrid.saveState("GridID");

Load State:
$.jgrid.loadState("GridID");
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="JQSuiteASPNETExample.examples.grid.functionality.saverestorestate._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</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" />
    <!-- The jQuery UI theme extension jqAutoComplete -->
    <link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqautocomplete.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>    
    <!-- The javascript for the grid search/edit advanced controls - datepicker and autocomplete -->
    <script src="/js/trirand/jquery.jqDatePicker.min.js" type="text/javascript"></script>
    <!-- The javascript for the autocomplete control -->
    <script src="/js/trirand/jquery.jqAutoComplete.min.js" type="text/javascript"></script>
    
    <style type="text/css">
        body, html { font-size: 80%; }            
        .ui-autocomplete-loading { background: white url('loading.gif') right center no-repeat; }        
    </style>

      <script type="text/javascript">

        function saveState() {
            $.jgrid.saveState("<%= JQGrid1.ClientID %>");
        }

        function loadState() {
            $.jgrid.loadState("<%= JQGrid1.ClientID %>"");
        }

    </script>

</head>
<body>
    <form id="form1" runat="server">       
  
    <trirand:JQGrid runat="server" ID="JQGrid1" DataSourceID="LinqDataSource1" 
            Width="600px" Height="260px" onsearching="JQGrid1_Searching" >
        <Columns>
            <trirand:JQGridColumn 
                DataField="OrderID" 
                Searchable="true"
                SearchToolBarOperation="IsEqualTo"
                DataType="Int"
                HeaderText="Order ID" 
                PrimaryKey="True" 
                Width="50" />
            <trirand:JQGridColumn
                DataField="CustomerID" 
                DataType="String"
                SearchType="DropDown" 
                SearchControlID="DropDownList1"
                SearchToolBarOperation="IsEqualTo" 
                ShowColumnMenu="true"
                />
            <trirand:JQGridColumn 
                DataField="OrderDate" 
                Searchable="true" 
                SearchType="DatePicker"
                SearchControlID="DatePicker1"              
                SearchToolBarOperation="IsEqualTo"
                DataType="DateTime"
                ShowToolTip="false"
                ShowColumnMenu="true"
                DataFormatString="{0:MMM/d/yyyy}"/>
             <trirand:JQGridColumn 
                DataField="Freight"  
                SearchType="DropDown"
                DataType="Decimal"
                ShowColumnMenu="true"
                SearchValues="[All]:[All];10:> 10;20:> 20;30:> 30;50:> 50" 
                SearchToolBarOperation="IsGreaterThan" />    
            <trirand:JQGridColumn 
                Searchable="true"
                DataType="String"
                SearchType="AutoComplete"
                SearchControlID="AutoComplete1"
                SearchToolBarOperation="Contains"
                DataField="ShipName" 
                Width="200" />                      
        </Columns> 
        <ToolBarSettings ShowSearchToolBar="true"/>                                        
    </trirand:JQGrid>

     <br /><br />

    <input type="button" value="Save State" onclick="saveState()" />
    &nbsp;&nbsp;&nbsp;&nbsp;
    <input type="button" value="Load State" onclick="loadState()" />
        
    
    <%-- This control will be used as a DatePicker search UI control in the grid toolbar--%>
    <%-- You can use JQDatePicker as a standalone control outside of a grid by setting DisplayMode="Standalone" --%>
    <trirand:JQDatePicker 
        DisplayMode="ControlEditor"
        runat="server" 
        ID="DatePicker1" 
        DateFormat="M/d/yyyy"
        MinDate="2010-01-01" 
        MaxDate="2020-01-01" 
        ShowOn="Focus" />  
        
    <%-- This control will be used as an AutoComplete search UI control in the grid toolbar--%>
    <%-- You can use JQAutoComplete as a standalone control outside of a grid by setting DisplayMode="Standalone" --%>
    <trirand:JQAutoComplete
        DisplayMode="ControlEditor"    
        DataTextField="ShipName"
        DataValueField="ShipName"
        DropDownWidth="200"
        Height="200"
        LoadingImageUrl="loading.gif"
        Filter="StartsWith"
        DataSourceID="SqlDataSource1"
        runat="server"
        ID="AutoComplete1"
    />
    
    <%--This control will be used as a DropDown search UI control in the grid toolbar--%>
    <asp:DropDownList 
        runat="server" 
        ID="DropDownList1" 
        DataSourceID="SqlDataSource2"
        DataTextField="CustomerID"
        DataValueField="CustomerID"
        AppendDataBoundItems="true">
        <asp:ListItem Text="[All]" Value="[All]"></asp:ListItem>
    </asp:DropDownList>
    
    <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
        AutoPage="true" AutoSort="true"
        ContextTypeName="JQSuiteASPNETExample.dbml.NorthWindDataClassesDataContext" 
        Select="new (OrderID, OrderDate, ShipName, CustomerID, Freight)"         
        TableName="OrdersLarges">
    </asp:LinqDataSource>
    
    <asp:SqlDataSource runat="server" ID="SqlDataSource1" 
        ConnectionString="<%$ ConnectionStrings:SQL2008_661086_trirandEntities %>"        
        SelectCommand="SELECT DISTINCT [ShipName] FROM [Orders]">
    </asp:SqlDataSource>        
    
     <asp:SqlDataSource runat="server" ID="SqlDataSource2" 
        ConnectionString="<%$ ConnectionStrings:SQL2008_661086_trirandEntities %>"                 
        SelectCommand="SELECT DISTINCT [CustomerID] FROM [Orders]">
    </asp:SqlDataSource> 
    
    <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;

namespace JQSuiteASPNETExample.examples.grid.functionality.saverestorestate
{
    public partial class _default : System.Web.UI.Page
    {
        protected void JQGrid1_Searching(object sender, Trirand.Web.UI.WebControls.JQGridSearchEventArgs e)
        {
            if (e.SearchString == "[All]")
                e.Cancel = true;
        }
    }
}
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" />