为什么给chart加个标题，索引超出范围。必须为非负值并小于集合大小。

string dbPath = @"D:\历年高考分数.db";
string sq = @"Data Source=" + dbPath;
m = new SQLiteConnection(sq);
m.Open();
SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select Volume1,Volume2 from 曲线", m);
DataSet ds = new DataSet();
mAdapter.Fill(ds);
DataTable dt = ds.Tables[0];
//设置图表的数据源
Chart1.DataSource = dt;
// Chart1.Series.Clear();
Chart1.Series["Series1"].ChartType = SeriesChartType.Spline;
Chart1.Series[0].XValueMember = "Volume1";//X轴数据成员列
Chart1.Series[0].YValueMembers = "Volume2";//Y轴数据成员列
Chart1.Series[0].IsValueShownAsLabel = true;//显示坐标
Chart1.ChartAreas[0].AxisX.Title = "运行里程（万公里）";
Chart1.ChartAreas[0].AxisY.Title = "故障率（%）";
Chart1.Titles[0].Text = "传感器故障发生率";
Chart1.ChartAreas[0].CursorX.IsUserEnabled = true;
Chart1.ChartAreas[0].CursorX.AutoScroll = true;
Chart1.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
Chart1.ChartAreas[0].CursorY.IsUserEnabled = true;
Chart1.ChartAreas[0].CursorY.AutoScroll = true;
Chart1.ChartAreas[0].CursorY.IsUserSelectionEnabled = true;
Chart1.DataBind();
m.Close();

Chart.Titles.Add()
先添加

Titles是空的，把

把Chart1.Titles[0].Text = "传感器故障发生率";
改成
chart1.Titles.Add(“感器故障发生率");