Use the Excel Export API to Show and Hide Gridlines

The example below demonstrates how to control the visibility of worksheet gridlines (the faint lines that separate rows and columns in a worksheet). To do this, use the IXlSheetViewOptions.ShowGridLines property of the IXlSheetViewOptions object that contains worksheet display settings and can be accessed using the IXlSheet.ViewOptions property.

// Create a worksheet. 
using (IXlSheet sheet = document.CreateSheet())
    // Hide gridlines on the worksheet.
    sheet.ViewOptions.ShowGridLines = false;

The image below shows the worksheet when gridlines are displayed, and when gridlines are hidden (the workbook is opened in Microsoft® Excel®).