public static IGridOptionsEnvironment Instance {get;}

{
    GridOptionsEnvironment.Instance.ShowGrid = !GridOptionsEnvironment.Instance.ShowGrid;
}

{
    QueuedTask.Run(() =>
    {
        //Does the 'map' currently have any options?
        var hasOptions = GridOptionsEnvironment.Instance.HasGridOptions(map);

        //If grid options have not been set for the map, then default grid options are added
        //for the map otherwise the existing gridoptions are returned.
        //NOTE: Grid options are returned by value meaning a copy is always returned. Any changes made to the
        //grid options need to be -set- back on the map using SetGridOptions for the changes to persist.
        var gridOptions = GridOptionsEnvironment.Instance.GetGridOptions(
                                   MapView.Active.Map);

        //Only return grid options if grid options have previously been set:
        var gridOptions2 = GridOptionsEnvironment.Instance.GetGridOptions(
                                   MapView.Active.Map, false);
    });
}

{
    //assume
    //var map = MapView.Active.Map;

    QueuedTask.Run(() =>
    {
        //If grid options have not been set for the map, then default grid options are added
        //for the map and returned otherwise the existing gridoptions are returned.
        //NOTE: Grid options are by value meaning a copy is returned. Any changes made to the
        //grid options need to be -set- back on the map using SetGridOptions for the changes to persist.
        var gridOptions = GridOptionsEnvironment.Instance.GetGridOptions(map);
        //change some properties
        gridOptions.RotateWithMap = !gridOptions.RotateWithMap;
        gridOptions.GridLineColor = ColorFactory.Instance.RedRGB;
        gridOptions.GridLineColor = ColorFactory.Instance.BlueRGB;
        //To apply changes, the gridoptions must be set back on the map
        GridOptionsEnvironment.Instance.SetGridOptions(map, gridOptions);
    });
}