QuestionRealtime charts with Microsoft charts control

**huynhdt** · Aug 12 '10, 08:08 AM

Hi Guys.

I am building a project that draw a chart with real time using Microsoft Charts Control . Data source of chart changes every a few seconds to reload data. but i have got a trouble with it. The error is '{"Cross-thread operation not valid: Control...'

I use thread job to start thread every time when checking thread is complete.

Code:

private void gLoads()
 {

 jHOSEIDX = new ThreadStart(LoadChart);
 tHOSEIDX = new Thread(jHOSEIDX);
 GTimer.Interval = 10000; // 10 seconds 
 GTimer.Tick += new EventHandler(Otherwise);
 GTimer.Enabled = true;
 }

Here is otherwise method.

Code:

private void Otherwise(object sender, EventArgs e)
 {
 if (!(tHOSEIDX.ThreadState.ToString().CompareTo("Running") == 0))
 {
 jHOSEIDX = new ThreadStart(LoadChart);
 tHOSEIDX = new Thread(jHOSEIDX);
 tHOSEIDX.Start();

 }
 }

Loadchart is a method reload data and adjust properties of chart.

Code:

private void LoadChart()
 {

 VnIndexChart.Titles[0].Text = "VN-Index";
 
 string fileNameString = AppDomain.CurrentDomain.BaseDirectory + @"\Data\Data.mdb";

 string myConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileNameString;

 string mySelectQuery = "SELECT TGian,Data.Ngay, Data.ChiSoHTai, Data.ChiSoGLap,Data.KLDuMua FROM Data Order By 1; ";
 OleDbConnection myConnection = new OleDbConnection(myConnectionString);
 OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);
 myConnection.Open();
 VnIndexChart.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
 VnIndexChart.Series["VN-Index"].XValueMember = "TGian";
 VnIndexChart.Series["VN-Index"].YValueMembers = "ChiSoHTai";
 VnIndexChart.Series["VN-Index"].XValueType = ChartValueType.Time;

 VnIndexChart.Series["VN-IDX.ESTIMATE"].XValueMember = "TGian";
 VnIndexChart.Series["VN-IDX.ESTIMATE"].XValueType = ChartValueType.Time;
 VnIndexChart.Series["VN-IDX.ESTIMATE"].YValueMembers = "ChiSoGLap";

 VnIndexChart.Series["Qlity"].XValueMember = "TGian";
 VnIndexChart.Series["Qlity"].YAxisType = AxisType.Secondary;
 VnIndexChart.Series["Qlity"].XValueType = ChartValueType.Time;
 VnIndexChart.Series["Qlity"].YValueMembers = "KLDuMua";
 VnIndexChart.DataBind();
 UpdateChartSettings();


 }

Help me fix the error.

here is source code http://www.mediafire.com/?3yve3x0l3s8lzb8

Thank You for you time.