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Copy and Paste records in ASP.NET Core Gantt control

You can copy and paste a record in the Gantt chart by using the addRecord method and custom context menu. It is also possible to copy and paste the parent record with multiple hierarchical child records on the required position.

tagHelper
copypasterecords.cs
@{
    List<object> contextItems = new List<object> { "AutoFitAll", "AutoFit", "TaskInformation", "DeleteTask", "Save", "Cancel",
    "SortAscending", "SortDescending", "Add", "DeleteDependency", "Convert"};

    contextItems.Add(new { text= "Copy", target= ".e-content", id= "copy" });
    contextItems.Add(new { text= "Paste", target= ".e-content", id= "paste" });

}

<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" enableContextMenu="true" contextMenuItems="contextItems"
           contextMenuOpen="contextMenuOpen" contextMenuClick="contextMenuClick">
    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                        endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks" dependency="Predecessor">
    </e-gantt-taskfields>
    <e-gantt-editsettings allowAdding="true" allowEditing="true" allowDeleting="true">
    </e-gantt-editsettings>
</ejs-gantt>

<script>
    var copiedRecord;
        function contextMenuOpen(args) {
            if (args.type !== 'Header') {
                if (copiedRecord) {
                    args.hideItems.push('Copy');
                } else {
                    args.hideItems.push('Paste');
                }
            }
        }
            function contextMenuClick(args) {
                var ganttObj = document.getElementById("Gantt").ej2_instances[0];
                if (args.item.id === 'copy') {
                    copiedRecord = args.rowData;
                    copiedRecord.taskData.TaskID = gantt.currentViewData.length + 1;
                }
                if (args.item.id === 'paste') {
                    gantt.addRecord(copiedRecord.taskData, 'Below', args.rowData.index);
                    if (copiedRecord.hasChildRecords) {
                        addChildRecords(copiedRecord, args.rowData.index + 1);
                    }
                    copiedRecord = undefined;
                }
        }
</script>
public IActionResult Index()
        {
            ViewBag.DataSource = ProjectNewData();
            return View();
        }