如何在vb.net中通过从数据库（sql）读取值来绘制线图？

我正在使用vb.net和sql作为我的数据库。 我将如何绘制一个折线图？通过使用此sql语句

我的X轴将是用户输入的时间戳的范围值，我将其指定为=从2013年6月24日上午8:38:00到2013年6月24日上午8:38:23 我的Y轴将是BB_ID，由用户输入，我将其分配为=3100

这是我的通用代码：

    Dim connectionString As String = "server='abc'; user id='***'; password='***'; Database='***'"
    Dim sqlConnection As SqlClient.SqlConnection = New SqlClient.SqlConnection(connectionString)

    sqlConnection.Open()

    Dim queryString As String = "SELECT Time_stamp, BB_ID, Status, " & _
    "(CASE WHEN Status = 'R' THEN 0 WHEN status = 'O' THEN 1 ELSE 2 END) AS newstatus"& _
    "FROM(dbo.rawdata)" & _
    "WHERE (BB_ID = '3100') AND (Time_stamp >= '6/24/2013 8:38:00 AM') AND (Time_stamp <= '6/24/2013 8:38:23 AM')"

    Chart1.Series("line_area").Points.AddXY("3100", "10")
    Chart1.Series("line_area").Points.AddXY("3100", "8")
    Chart1.Series("line_area").ChartType = System.Web.UI.DataVisualization.Charting.SeriesChartType.Line

    sqlConnection.Close()

Dim connectionString As String=“server='abc'；用户id='***'；密码='***'；数据库='***'”
Dim sqlConnection As SqlClient.sqlConnection=New SqlClient.sqlConnection（connectionString）
sqlConnection.Open（）
Dim queryString As String=“选择时间戳、BB\U ID、状态，&”_
“（状态为'R'时为案例，状态为'O'时为0，然后为1或2结束）作为newstatus”&_
“来自（dbo.rawdata）”&_
其中（BB_ID='3100'）和（Time_stamp>='6/24/2013 8:38:00 AM'）和（Time_stamp无需更改为ZedGraph.MSChart在这种情况下也可以正常工作。您已经创建了查询字符串，但没有查询数据库

string connectionString =   // your connection string
string queryString =        // your query string

// Create a database connection object using the connection string    
SQLConnection sqlConnection =  // your connection object

// Create a database command on the connection using query    
SQLCommand  sqlCommand = // your command

sqlConnection .Open();

// set chart data source - the data source must implement IEnumerable
chart1.DataSource = sqlCommand.ExecuteReader(CommandBehavior.CloseConnection);

// Set series members names for the X and Y values 
chart1.Series["line_area"].XValueMember = "Time_stamp"; // the column you want on X axis
chart1.Series["line_area"].YValueMembers = "BB_ID"; // the column you want on Y axis

// Data bind to the selected data source
chart1.DataBind();

在代码中

Chart1.Series("line_area").Points.AddXY("3100", "10")
Chart1.Series("line_area").Points.AddXY("3100", "8")

您只是向图表中添加了两点，仅此而已，数据库中的数据根本没有连接到图表