By default, the DrawGridLines property is exNoLines. Use the DrawGridLines property to specify whether the control draws the grid lines in the chart's area. The GridLineStyle property to specify the style for horizontal or/and vertical gridlines in the chart view. Use the DrawGridLines property of the Level object to show the vertical grid lines for the specified level. Use the GridLineColor property of the Level object to specify the color for vertical grid lines in the chart area. Use the GridLineStyle property of the Level object to specify the style for vertical grid lines in the chart area.  Use the GridLineColor property to specify the color for grid lines. Use the DrawGridLines property to specify whether the control draws the grid lines in the items area. Use the DrawLevelSeperator property to draw lines between levels inside the chart's header. Use the DrawTickLines property to specify whether the grid lines between time units in the level are visible or hidden. Use the MarkTodayColor property to specify the color to mark the today date. Use the NonworkingDays property to specify the nonworking days. Use the NonworkingDaysPattern property to specify the brush to fill the nonworking days area.

In conclusion, the following properties are related to the control's gridlines:

• DrawGridLines specifies whether the gridlines are shown in the column/list part of the control. The gridlines in the chart part of the control are handled by the Chart.DrawGridLines property.
• GridLineColor specifies the color to show the horizontal grid line, and vertical grid lines for the columns/list part of the control. The color for vertical grid lines in the chart view part is handled by the Level.GridLineColor property.
• GridLineStyle specifies the style for horizontal grid lines and vertical grid lines in the columns/list part of the control. The Level.GridLineStyle property specifies the style for vertical grid lines in the chart area.
• Chart.DrawGridLines (belongs to Chart object) indicates whether gridlines are shown in the chart view.
• Level.DrawGridLines (belongs to Level object) specifies whether the level shows vertical gridlines in the chart part of the control.
• Level.GridLineColor (belongs to Level object) indicates the color for vertical gridlines in the chart view.
• Level.GridLineStyle (belongs to Level object) specifies the style to show the vertical gridlines in the chart part area of the control.