@model  CRM.ViewModels.GridList<CRM.Models.AaaUser>
var gridcolumns = new List<WebGridColumn>();
gridcolumns.Add(new WebGridColumn()
        {
            ColumnName = "SDUser.Department.Definition.DEPTNAME",
            Header = Html.DisplayNameFor(model => model.Content.FirstOrDefault().SDUser.Department.Definition.DEPTNAME).ToString(),
            CanSort = true
        });
//code goes here for others `WebGridColumn`.....

var grid = new WebGrid(
                        canPage: true,
                        rowsPerPage: Model.PageSize,
                        canSort: true,
                        ajaxUpdateContainerId: "grid");

            grid.Bind(Model.Content, rowCount: Model.TotalRecords, autoSortAndPage: false);
            grid.Pager(WebGridPagerModes.All);

            @grid.GetHtml(htmlAttributes: new { id = "grid" },   // id for ajaxUpdateContainerId parameter
            fillEmptyRows: false,
            tableStyle: "table table-bordered table-hover",
            mode: WebGridPagerModes.All,
            columns: gridcolumns

            );