How to export the web grid data in excel in formatted manner

How to export the web grid data in excel with formatted manner

After importing excel data is not coming in formatted manner

WebGrid grid = new WebGrid(model.TicketReportDataModel, rowsPerPage: model.PageSize, canPage: true);
string gridData = grid.GetHtml(
columns: grid.Columns(
grid.Column(columnName: "ticketNo", header: "Ticket No", canSort: false),
grid.Column(columnName: "Summary", header: "Title", canSort: false),
grid.Column(columnName: "Contact_Name", header: "Contact", canSort: false),
grid.Column(columnName: "SR_Status", header: "Status", canSort: false),
grid.Column(columnName: "Site_Name", header: "Site Name", canSort: false),
grid.Column(columnName: "SR_Type_Description", header: "Type", canSort: false),
grid.Column(columnName: "Company", header: "Company", canSort: false),
grid.Column(columnName: "Board", header: "Board", canSort: false),
grid.Column(columnName: "Discussion", header: "Discussion", canSort: false),
grid.Column(columnName: "Resolution", header: "Resolution", canSort: false),
grid.Column(columnName: "SubType_Description", header: "SubType", canSort: false),
grid.Column(columnName: "Date_Entered", header: "Date Entered", canSort: false))).ToString();
//ExcelPackage pk = new ExcelPackage();
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename=TicketList.xls"); //Response.ContentType = "applicatiom/vnd.ms-excel";
Response.ContentType = "application/octet-stream";
Response.Write(gridData);
Response.End();