One of the ways to edit data is by using the Edit Dialog functionality. You can launch Edit Dialog by selecting a row and then clicking on the "Edit" button in the grid toolbar (bottom left in this example). For this, you need to have toolbar enabled.

By default, columns are not editable. To make them editable, set the Editable property of the respective column to true.

When the user edits the data and sends it to the server, jqGrid fires the OnEditing event. You can hook custom code in this event and using the event arguments (RowData and RowKey) you can find the respective row in your datasource and modify it (and send it to the database).

You can customize almost any feature of the edit dialog via the EditDialogSettings collection (for example TopOffset, LeftOffset, Caption, SubmitButtonText, etc)

Please, take a look at the code in the ASPX and C# tabs for additional details.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="JQSuiteASPNETExample.examples.edititing_data.edit_dialog._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 - Edit Dialog</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">
    <div>       
       <trirand:JQGrid ID="JQGrid1" runat="server" Width="600px"  
            OnRowEditing="JQGrid1_RowEditing">         
            <Columns>
                <trirand:JQGridColumn DataField="CustomerID" Editable="false" PrimaryKey="true"/>
                <trirand:JQGridColumn DataField="CompanyName" Editable="true" />
                <trirand:JQGridColumn DataField="Phone" Editable="true">
                    <EditFieldAttributes>
                        <trirand:JQGridEditFieldAttribute Name="tabindex" Value="17" />
                    </EditFieldAttributes>
                </trirand:JQGridColumn>
                <trirand:JQGridColumn DataField="PostalCode" Editable="true"/>
                <trirand:JQGridColumn DataField="City" Editable="true" />
            </Columns>            
            <ToolBarSettings ShowViewRowDetailsButton="true" ShowEditButton="true" ShowAddButton="true" />                        
            <EditDialogSettings CloseAfterEditing="true" Caption="Edit the selected row" Modal="true" Draggable="false"/>                        
            <ClientSideEvents BeforeEditDialogShown="beforeEdit" AfterEditDialogRowInserted="afterEdit" />
       </trirand:JQGrid>
       
       <script type="text/javascript">
       
       var lastSelectedRow;
       
       function beforeEdit(rowID) {
          var grid = jQuery("#<%= JQGrid1.ClientID %>");
          lastSelectedRow = grid.getGridParam("selrow");
       };
       
       function afterEdit() {
           var grid = jQuery("#<%= JQGrid1.ClientID %>");
           grid.setSelection(lastSelectedRow);
       };
       
       </script>
       
       <br /><br />
       <trirand:codetabs runat="server" id="DataTableCodeTabs"></trirand:codetabs>       
       
    </div>
    </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;
using System.Data.SqlClient;
using System.Configuration;
using Trirand.Web.UI.WebControls;

namespace JQSuiteASPNETExample.examples.edititing_data.edit_dialog
{
    public partial class _default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (JQGrid1.AjaxCallBackMode == AjaxCallBackMode.RequestData)
            {
                JQGrid1.DataSource = GetData();
                JQGrid1.DataBind();
            }
        }

        protected void JQGrid1_RowEditing(object sender, Trirand.Web.UI.WebControls.JQGridRowEditEventArgs e)
        {
            DataTable dt = GetData();
            dt.PrimaryKey = new DataColumn[] { dt.Columns["CustomerID"] };
            DataRow rowEdited = dt.Rows.Find(e.RowKey);

            rowEdited["CompanyName"] = e.RowData["CompanyName"];
            rowEdited["Phone"] = e.RowData["Phone"];
            rowEdited["PostalCode"] = e.RowData["PostalCode"];
            rowEdited["City"] = e.RowData["City"];

            JQGrid1.DataSource = GetData();
            JQGrid1.DataBind();
        }

        protected DataTable GetData()
        {
            if (Session["EditDialogData"] == null)
            {
                // 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 sqlStatement = "SELECT CustomerID, CompanyName, Phone, PostalCode, City FROM Customers";

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

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

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

                Session["EditDialogData"] = dtResult;

                return dtResult;
            }
            else
            {
                return Session["EditDialogData"] as DataTable;
            }
        }
         
    }
}
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" />