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 action specidied by the EditUrl property. Them, you can use the GetEditData method to get a Hashtable of all edited values.

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 View and Controller tabs for additional details.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using Trirand.Web.Mvc;

namespace MVCDemo.Models
{
    public class OrdersJqGridModel
    {
        public JQGrid OrdersGrid { get; set; }

        public OrdersJqGridModel()
        {
            OrdersGrid = new JQGrid
            {
                Columns = new List<JQGridColumn>()
                {
                    new JQGridColumn 
                    {
                        // Always set PrimaryKey for Add,Edit,Delete operations
                        // If not set, the first column will be assumed as primary key
                        DataField = "OrderID",                                        
                        PrimaryKey = true,
                        Editable = false,
                        Width = 50,
                        DataType = typeof(int)
                    },                                    
                    new JQGridColumn 
                    { 
                        DataField = "CustomerID", 
                        Editable = true,
                        Width = 100,
                        DataType = typeof(string)
                    },
                    new JQGridColumn 
                    { 
                        DataField = "OrderDate",                                                         
                        Editable = true,
                        Width = 100, 
                        DataFormatString = "{0:yyyy/MM/dd}",
                        DataType = typeof(DateTime)
                    },
                    new JQGridColumn
                    { 
                        DataField = "Freight", 
                        Editable = true,
                        Width = 75,
                        DataType = typeof(double)
                    },
                    new JQGridColumn 
                    { 
                        DataField = "ShipName",
                        Editable =  true,
                        Width = 150,
                        DataType = typeof(string)
                    }
                },
                
                Width = Unit.Pixel(640),
                Height = Unit.Percentage(100),
                
                ToolBarSettings = new ToolBarSettings
                {
                    ShowRefreshButton = true
                }
            };  
        }        
    }
}
@model MVCDemo.Models.OrdersJqGridModel
@using Trirand.Web.Mvc
@using MVCDemo.Models

<!DOCTYPE html>
<html lang="en-us">
<head>
    <meta charset="utf-8">
    <title>jqGrid for ASP.NET MVC - Edit Row Dialog</title>    
    <!-- jQuery runtime minified -->
    <script src="~/Scripts/jquery-3.2.1.min.js" type="text/javascript"></script>
    <!-- The jqGrid localization file we need, English in this case -->
    <script type="text/javascript" src="~/Scripts/trirand/i18n/grid.locale-en.js"></script>
    <!-- The jqGrid client-side javascript -->
    <script type="text/javascript" src="~/Scripts/trirand/jquery.jqGrid.min.js"></script>

    <!-- The jQuery UI theme that will be used by the grid. -->
    <link rel="stylesheet" type="text/css" 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" href="~/Content/themes/ui.jqgrid.css" />
</head>
<body>
    <div style="width:100%">        
        @Html.Trirand().JQGrid(Model.OrdersGrid, "EditDialogGrid")
    </div>
    <br /><br />
    <div>
          
    </div>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MVCDemo.Models;
using Trirand.Web.Mvc;
using System.Web.UI.WebControls;

namespace MVCDemo.Controllers.Grid
{
    public partial class GridController : Controller
    {
        // This is the default action for the View. Use it to setup your jqGrid Model.
        public ActionResult EditDialog()
        {
            // Get the model (setup) of the grid defined in the /Models folder.
            var gridModel = new OrdersJqGridModel();
            // This method sets common properties for the grid, different than the default in the Model
            EditDialog_SetUpGrid(gridModel.OrdersGrid);

            // Pass the custmomized grid model to the View
            return View(gridModel);
        }

        // This method is called when the grid requests data. You can choose any method to call
        // by setting the JQGrid.DataUrl property. We are doing this in the EditDialog_SetUpGrid method.
        public JsonResult EditDialog_DataRequested()
        {            
            // Get both the grid and data models. For data model, make sure IQueryable is implemented (most linq-2-* cases)
            // The data model in our case is an autogenerated linq2sql database based on Northwind.
            var gridModel = new OrdersJqGridModel();
            var dataModel = GetOrders().AsQueryable();            

            // This method sets common properties for the grid, different than the default in the Model
            EditDialog_SetUpGrid(gridModel.OrdersGrid);

            // return the result of the DataBind method, passing the datasource as a parameter
            // jqGrid for ASP.NET MVC automatically takes care of paging, sorting, filtering/searching, etc
            return gridModel.OrdersGrid.DataBind(dataModel);
        }
        
        public void EditDialog_EditRow(Order editedOrder)
        {
            // Get the grid and database (northwind) models
            var gridModel = new OrdersJqGridModel();
            var northWindModel = new NorthwindDataContext();

            // If we are in "Edit" mode, get the Order from database that matches the edited order
            // Check for "Edit" mode this way, we can also be in "Delete" or "Add" mode as well in this method
            if (gridModel.OrdersGrid.AjaxCallBackMode == AjaxCallBackMode.EditRow)
            {
                // Get the data from and find the Order corresponding to the edited row
                List<Order> gridData = GetOrders();
                Order orderToUpdate = gridData.Single<Order>(o => o.OrderID == editedOrder.OrderID);

                // Update the Order information to match the edited Order data
                // In this demo we do not need to update the database since we are using Session
                // In your case you may need to actually hit the database
                orderToUpdate.OrderDate = editedOrder.OrderDate;
                orderToUpdate.CustomerID = editedOrder.CustomerID;
                orderToUpdate.Freight = editedOrder.Freight;
                orderToUpdate.ShipName = editedOrder.ShipName;                
                
                // This will save the changes into the database. We have commented this since this is just an online demo
                // northWindModel.SubmitChanges();
            }          
        }

        public void EditDialog_SetUpGrid(JQGrid ordersGrid)
        {   
            ordersGrid.DataUrl = Url.Action("EditDialog_DataRequested");
            ordersGrid.EditUrl = Url.Action("EditDialog_EditRow");
            ordersGrid.ToolBarSettings.ShowEditButton = true;
            ordersGrid.EditDialogSettings.CloseAfterEditing = true;            

            // setup the dropdown values for the CustomerID editing dropdown
            EditDialog_SetUpCustomerIDColumn(ordersGrid);
        }

        private void EditDialog_SetUpCustomerIDColumn(JQGrid ordersGrid)
        {
            // setup the grid search criteria for the columns
            JQGridColumn customersColumn = ordersGrid.Columns.Find(c => c.DataField == "CustomerID");
            customersColumn.Editable = true;
            customersColumn.EditType = EditType.DropDown;

            // Populate the search dropdown only on initial request, in order to optimize performance
            if (ordersGrid.AjaxCallBackMode == AjaxCallBackMode.RequestData)
            {
                var northWindModel = new NorthwindDataContext();
                var editList = from customers in northWindModel.Customers
                               select new SelectListItem
                               {
                                   Text = customers.CustomerID,                                   
                                   Value = customers.CustomerID
                               };

                customersColumn.EditList = editList.ToList<SelectListItem>();
            }
        }


        // This is a helper method fetching the data from Session
        public List<Order> EditDialog_GetOrders()
        {
            List<Order> orders;
            if (Session["Orders"] == null)
            {
                var northWindModel = new NorthwindDataContext();
                orders = (from order in northWindModel.Orders
                          select order).ToList<Order>();
                Session["Orders"] = orders;
            }
            else
            {
                orders = Session["Orders"] as List<Order>;
            }

            return orders;
        }
    }
}
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" />