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  1. PO
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    <p>I think you can use the method that allow refresh only the series, RefreshSeries, as do in next line of code:</p> <pre><code> candle1.RefreshSeries(); </code></pre> <p>Could you tell me, if it works for you? If you have any problems please let me know.</p> <p>Update information to answer next question:</p> <blockquote> <p>Ok, I guess I am not explaining myself well here, Sandra. Let me try again. Let's say I have a chart that has only one series - 30,000 candles. Let's say I show ALL candles on the chart. Redrawing all 30K candles takes time. Let's say the code changes only ONE candle - the last one. Is there any way to just repaint that little portion of the chart that has the new candle, and not repaint the whole chart in order to show the new change? I tried Invalidate function passing it the candle's rectangle, but it seems that Invalidate() and Invalidate(rect) produce exactly same results.</p> </blockquote> <p>Can you tell us which version of TeeChart are you using?. In the other hand, I have made a simple code where I have modified the CloseValue and I have released that isn't necessary repaint, redraw or refresh Series because the value is updated automatically. I have made the test using last version of TeeChartFor.Net Build number [4.1.2012.01312] and next code:</p> <pre><code>Steema.TeeChart.Styles.Candle candleSeries1; Random r; double tmpOpen; double tmpClose; int count; DateTime dt; TimeSpan ts; private void InitializeChart() { tChart1.Aspect.View3D=false; tChart1.AutoRepaint = false; r = new Random(); candleSeries1.Clear(); candleSeries1.XValues.DateTime = true; candleSeries1.GetHorizAxis.Labels.Angle = 90; count = 0; dt = DateTime.Today; ts = TimeSpan.FromDays(1); candleSeries1.Pen.Visible = false; for (int t=0;t&lt;30000;t++) { tmpOpen = r.Next(100); tmpClose = tmpOpen - r.Next(100); ++count; candleSeries1.Add(dt,tmpOpen,tmpOpen + r.Next(50), tmpClose -r.Next(50),tmpClose); dt += ts; } tChart1.AutoRepaint = true; } private void button1_Click(object sender, EventArgs e) { tmpOpen = r.Next(100); tmpClose = tmpOpen - r.Next(100); candleSeries1[candleSeries1.LastVisibleIndex].Close = tmpOpen; } </code></pre> <p>Thanks, </p>
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    1. USSandra Pazos
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    1. COIt works in the sense of doing the same thing visually but I don't think it is much faster than refreshing the chart. The whole point here is that there are a lot of candles in the series (30K or so) and if they are all shown redrawing is fairly slow. Can't just redraw the last candle? Also - when I update CloseValues, isn't it supposed to update itself visually? AutoRepaint's are true...
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    2. CORecalculates all dependent Series points again.
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      1. USSandra Pazos
    3. COHello, The RefreSeries() method is faster than tChart.Draw, because it recalculates all dependent Series points again but doesn't repaint all the Canvas. There is other method that can be useful for you when you want update only values of Series. It is checkDataSource method that refreshes all Series point values, either from database Tables, Queries or Series points.
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