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    <p>You have two options,</p> <p>1) Use <a href="http://zedgraph.sourceforge.net/documentation/html/T_ZedGraph_BoxObj.htm" rel="nofollow noreferrer">BoxObject</a> to draw at a specific region as follows</p> <p><img src="https://i.stack.imgur.com/vCtv1.jpg" alt="enter image description here"></p> <p>and you can use the source code as follows:</p> <pre><code> private void Form1_Load(object sender, EventArgs e) { // Create an instance of Graph Pane GraphPane myPane = zedGraphControl1.GraphPane; // Build a PointPairList with points based on Sine wave PointPairList list = new PointPairList(); for (double i = 0; i &lt; 36; i++) { double x = i * 10.0 + 50.0; double y = Math.Sin(i * Math.PI / 15.0) * 16.0; list.Add(x, y); } // Hide the legend myPane.Legend.IsVisible = false; // Add a curve LineItem curve = myPane.AddCurve("label", list, Color.Red, SymbolType.Circle); curve.Line.Width = 1.5F; curve.Symbol.Fill = new Fill(Color.White); curve.Symbol.Size = 5; // Make the XAxis start with the first label at 50 myPane.XAxis.Scale.BaseTic = 50; // Fill the axis background with a gradient myPane.Chart.Fill = new Fill(Color.White, Color.SteelBlue, 45.0F); // Draw Region 1 drawRegion(list[0].X, list[10].X,"Positive Cycle"); // Calculate the Axis Scale Ranges zedGraphControl1.AxisChange(); // Refresh to paint the graph components Refresh(); } private void drawRegion(double xMin, double xMax, string regName) { GraphPane pane = zedGraphControl1.GraphPane; BoxObj box = new BoxObj(xMin,20, xMax, 40.0, Color.Empty, Color.LightSteelBlue);// Color.FromArgb(225, 245, 225)); box.Location.CoordinateFrame = CoordType.AxisXYScale; box.Location.AlignH = AlignH.Left; box.Location.AlignV = AlignV.Top; // place the box behind the axis items, so the grid is drawn on top of it box.ZOrder = ZOrder.E_BehindCurves;//.D_BehindAxis;//.E_BehindAxis; pane.GraphObjList.Add(box); // Add Region text inside the box TextObj myText = new TextObj(regName, 160, -15); myText.Location.CoordinateFrame = CoordType.AxisXYScale; myText.Location.AlignH = AlignH.Right; myText.Location.AlignV = AlignV.Center; myText.FontSpec.IsItalic = true; myText.FontSpec.IsBold = false; myText.FontSpec.FontColor = Color.Red; myText.FontSpec.Fill.IsVisible = false; myText.FontSpec.Border.IsVisible = false; pane.GraphObjList.Add(myText); zedGraphControl1.Refresh(); } </code></pre> <p>2) This is a bit difficult but do-able, Draw individual vertical lines discussed here: <a href="https://stackoverflow.com/questions/6002252/zedgraph-adding-threshold-line">1</a>, <a href="https://stackoverflow.com/questions/12422398/drawing-line-on-a-click-on-zedgraph-pane">2</a> and add the required text etc.</p> <p>I suggest you to use the <code>option 1</code>, which is lot easier than 2 !</p>
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    1. POMark the regions over the zed graph
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    1. COThanks for your response San. My requirement team is not okay with your alternate solution. I think, currently no other graph is also supports these type of markings in graph. So, I started to write my own control to do this. Thanks again for your help.
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