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POAvoid Label Blinking Using Timer Control
 

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    <p>im working on a code-editor (winforms)</p> <p>and im working on countline using a label something like this:</p> <p><a href="http://oi42.tinypic.com/iypoub.jpg" rel="nofollow">http://oi42.tinypic.com/iypoub.jpg</a></p> <p>using this code:</p> <pre><code>private void timer_countline_Tick(object sender, EventArgs e) { updateNumberLabel(); } private void updateNumberLabel() { //we get index of first visible char and number of first visible line Point pos = new Point(0, 0); int firstIndex = rtb.GetCharIndexFromPosition(pos); int firstLine = rtb.GetLineFromCharIndex(firstIndex); //now we get index of last visible char and number of last visible line pos.X = ClientRectangle.Width; pos.Y = ClientRectangle.Height; int lastIndex = rtb.GetCharIndexFromPosition(pos); int lastLine = rtb.GetLineFromCharIndex(lastIndex); //this is point position of last visible char, we'll use its Y value for calculating numberLabel size pos = rtb.GetPositionFromCharIndex(lastIndex); //finally, renumber label numberLabel.Text = ""; for (int i = firstLine; i &lt;= lastLine + 1; i++) { numberLabel.Text += i + 1 + "\n"; } } </code></pre> <p>timer set interval to 1 . label dock = left . now the problem was everytime i runs the program the label was blinking nonstop so fast . even i change interval still the same thing .</p> <p>but when i transfer the updateNumberLabel() to textchange event it still blinks everytime i add a char on richtextbox or i press space .</p> <p>like this: <a href="http://oi40.tinypic.com/a43gcy.jpg" rel="nofollow">http://oi40.tinypic.com/a43gcy.jpg</a></p> <p>now my question was how can i avoid this? or is there anyway i can do to avoid blinking of the whole label when gets updated?</p> <p>thanks a lot in advance for the help!</p>
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    1. USElegiac
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    1. COBy blinking, do you mean flickering? Or is it a steady blink?
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    2. CO@cokeman19 flickering fast when i use timer ... the time i pass to textchange event it flickers the time i add text on the richtextbox
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    3. COYou may benefit from enabling double buffering, either at the label level or possibly the form level. There are examples of both here: http://stackoverflow.com/questions/3816362/winforms-label-flickering.
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