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    <p>The <a href="http://zedgraph.sourceforge.net/documentation/html/T_ZedGraph_GraphPane.htm" rel="noreferrer">GraphPane</a> contains a <a href="http://zedgraph.sourceforge.net/documentation/html/P_ZedGraph_GraphPane_CurveList.htm" rel="noreferrer">CurveList</a> property, and the <a href="http://zedgraph.sourceforge.net/documentation/html/T_ZedGraph_CurveList.htm" rel="noreferrer">CurveList</a> class is a subclass of <code>List&lt;CurveItem&gt;</code>. If you set the <a href="http://zedgraph.sourceforge.net/documentation/html/F_ZedGraph_CurveItem_Tag.htm" rel="noreferrer">CurveItem.Tag</a> property for each curve that you draw, I believe you should be able to sort the curve items by using the <code>CurveList.Sort(IComparer&lt;CurveItem&gt;)</code> method and using the <code>Tag</code> to represent the sorting order.</p> <p><strong>UPDATE JUNE 19</strong></p> <p>Simple example: two lines, the blue <code>line2</code> with <code>line2.Tag = 2</code> and the red <code>line1</code> with <code>line1.Tag = 1</code>. In the initialization <code>line2</code> is added first to the graph pane, so it will be displayed on top.</p> <pre><code>void GraphInit() { var line2 = _graph.GraphPane.AddCurve("Second", new[] { 0.1, 0.5, 0.9 }, new[] { 0.1, 0.5, 0.1 }, Color.Blue); line2.Tag = 2; var line1 = _graph.GraphPane.AddCurve("First", new[] { 0.1, 0.5, 0.9 }, new[] { 0.1, 0.5, 0.9 }, Color.Red); line1.Tag = 1; _graph.Refresh(); } </code></pre> <p><img src="https://i.stack.imgur.com/lI4KM.png" alt="Initial display before sorting"></p> <p>To sort, first implement a class that implements <code>IComparer&lt;CurveItem&gt;</code>, and that sorts the curve items in ascending order based on the numerical value of the <code>CurveItem</code> <code>Tag</code> property:</p> <pre><code>class CurveItemTagComparer : IComparer&lt;CurveItem&gt; { public int Compare(CurveItem x, CurveItem y) { return ((int)x.Tag).CompareTo((int)y.Tag); } } </code></pre> <p>To perform re-sorting and update the graph, implement the following event handler for the <em>Sort</em> button:</p> <pre><code>void SortButtonClick(object sender, EventArgs e) { _graph.GraphPane.CurveList.Sort(new CurveItemTagComparer()); _graph.Refresh(); } </code></pre> <p>Now, when clicking the <em>Sort</em> button, the curves will be sorted such that the curve with the lowest tag value, i.e. <code>line1</code>, will instead be drawn on top. Additionally, note that the curve order in the legend is changed along.</p> <p><img src="https://i.stack.imgur.com/V9U3h.png" alt="Graph after Sort button is clicked"></p>
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    1. POHow to bring specific curves in-front in ZedGraph
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    1. USAnders Gustafsson
    1. USAnders Gustafsson
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    1. COwow, you just made my day.... I struggled a lot to set the tag property of the curve....You're the * & Thanks a million for the clear explanation...:)
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