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POLabel text doesn't get updated until the whole loop is completed
 

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  1. POLabel text doesn't get updated until the whole loop is completed
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    <p>I have a Winform program that does some calculations when the user clicks on a button and then calls the picturebox paint event to draw a new BMP based on the results of the calculations. This works fine.</p> <p>Now I want to do this 100 times and every time the picturebox is refreshed, I want to see the iteration that it's currently in by updating the text on a label as per below:</p> <pre><code> private void button2_Click(object sender, EventArgs e) { for (int iterations = 1; iterations &lt;= 100; iterations++) { // do some calculations to change the cellmap parameters cellMap.Calculate(); // Refresh picturebox1 pictureBox1.Invalidate(); pictureBox1.Update(); // Update label with the current iteration number label1.Text = iterations.ToString(); } } private void pictureBox1_Paint(object sender, PaintEventArgs e) { Bitmap bmp = new Bitmap(cellMap.Dimensions.Width, cellMap.Dimensions.Height); Graphics gBmp = Graphics.FromImage(bmp); int rectWidth = scaleFactor; int rectHeight = scaleFactor; // Create solid brushes Brush blueBrush = new SolidBrush(Color.Blue); Brush greenBrush = new SolidBrush(Color.Green); Brush transparentBrush = new SolidBrush(Color.Transparent); Graphics g = e.Graphics; for (int i = 0; i &lt; cellMap.Dimensions.Width; i++) { for (int j = 0; j &lt; cellMap.Dimensions.Height; j++) { // retrieve the rectangle and draw it Brush whichBrush; if (cellMap.GetCell(i, j).CurrentState == CellState.State1) { whichBrush = blueBrush; } else if (cellMap.GetCell(i, j).CurrentState == CellState.State2) { whichBrush = greenBrush; } else { whichBrush = transparentBrush; } // draw rectangle to bmp gBmp.FillRectangle(whichBrush, i, j, 1f, 1f); } } g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor; g.DrawImage(bmp, 0, 0, pictureBox1.Width, pictureBox1.Height); } </code></pre> <p>The problem I am having is that the label text only gets displayed after the last picturebox update is completed. So essentially, it does not display 1 through to 99. I can see the picturebox updates after every refresh as the BMP changes with every iteration. Any idea?</p>
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    1. USJohn Saunders
    1. USdeutschZuid
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      1. VTUpMod
    1. CODid you try to call `label1.Invalidate();` or/and `label1.Update();` after text change?
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      1. UShorgh
    2. CONo, but after adding these two statements, it started working. I don't understand why though?
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      1. POLabel text doesn't get updated until the whole loop is completed
      1. USdeutschZuid
    3. COTry reading this [Control.Update Method](http://msdn.microsoft.com/en-us/library/system.windows.forms.control.update.aspx)
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      1. POLabel text doesn't get updated until the whole loop is completed
      1. UShorgh
 

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