To format the style of the grid lines: C1Chart3D1.ChartArea.AxisX.MajorGrid. Style.Color = Color.Blue To turn off the grid lines, use the 3 methods IsOnXYPlane, IsOnYZPlane, and IsOnXZPlane, for each axis such as: C1Chart3D1.ChartArea.AxisX.MajorGrid.IsOnXZPlane = False hope that helps, Greg L