Windows forms C#如何使图表的网格线成为方形？

using System.Windows.Forms.DataVisualization.Charting;

// 创建一个Chart控件
Chart chart1 = new Chart();

// 添加一个ChartArea
ChartArea chartArea1 = new ChartArea();
chart1.ChartAreas.Add(chartArea1);

// 设置网格线为方形
chartArea1.AxisX.MajorGrid.Enabled = true;
chartArea1.AxisX.MajorGrid.LineDashStyle = ChartDashStyle.Solid;
chartArea1.AxisX.MajorGrid.LineColor = Color.Black;
chartArea1.AxisX.MajorGrid.LineWidth = 1;
chartArea1.AxisX.MajorGrid.Interval = 1;
chartArea1.AxisX.MajorGrid.IntervalOffset = 0;

chartArea1.AxisY.MajorGrid.Enabled = true;
chartArea1.AxisY.MajorGrid.LineDashStyle = ChartDashStyle.Solid;
chartArea1.AxisY.MajorGrid.LineColor = Color.Black;
chartArea1.AxisY.MajorGrid.LineWidth = 1;
chartArea1.AxisY.MajorGrid.Interval = 1;
chartArea1.AxisY.MajorGrid.IntervalOffset = 0;