Form1_Load() is not executed for drawing a graph

Question

I need to draw a graph in C# by ZedGraph in VS2013. I have created a windowns application project and added Form1.cs as win forms file. But, when I ran the code, only an empty form was created but no graph. In debug mode, I found that Form1_Load() is not executed. Why ?

This is the C# code.

using System.Windows.Forms;
using ZedGraph;
namespace zedgraph_test
{
  public partial class Form1 : Form
  {
    public Form1()
    {
        InitializeComponent();
    }
    // it is not executed.
    private void Form1_Load(object sender, EventArgs e)
    {
        Console.WriteLine("Form1_Load is called");
        ZedGraph.ZedGraphControl zg1 = new ZedGraphControl();
        CreateChart(zg1);
    }
    // definition of CreateChart
    ...
}

Any help would be appreciated.

UPDATE

I have tried the solution but I only got an empty form and no charts displayed in the form.

This is code of From1.cs.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ZedGraph;
namespace zedgraph_test1
{
  public partial class Form1 : Form
  {
      public Form1()
      {
         InitializeComponent();
      }

      private void Form1_Load(object sender, EventArgs e)
      {
        Console.WriteLine("Form1_Load is called");
        ZedGraph.ZedGraphControl zg1 = new ZedGraphControl();
        CreateChart(zg1);
        SetSize();
      }

      private void Form1_Resize(object sender, EventArgs e)
      {
        SetSize();
      }

      private void SetSize()
      {
         zg1.Location = new Point(10, 10);
        // Leave a small margin around the outside of the control
        zg1.Size = new Size(this.ClientRectangle.Width - 20, this.ClientRectangle.Height - 20);
      }


      // Call this method from the Form_Load method, passing your ZedGraphControl
     public static void CreateChart(ZedGraphControl zgc)
     {
         GraphPane myPane = zgc.GraphPane;

        // Set the title and axis labels
        myPane.Title.Text = "Vertical Bars with Value Labels Above Each Bar";
        myPane.XAxis.Title.Text = "Position Number";
        myPane.YAxis.Title.Text = "Some Random Thing";

        PointPairList list = new PointPairList();
        PointPairList list2 = new PointPairList();
        PointPairList list3 = new PointPairList();
        Random rand = new Random();

        // Generate random data for three curves
        for (int i = 0; i < 5; i++)
        {
            double x = (double)i;
            double y = rand.NextDouble() * 1000;
            double y2 = rand.NextDouble() * 1000;
            double y3 = rand.NextDouble() * 1000;
            list.Add(x, y);
            list2.Add(x, y2);
            list3.Add(x, y3);
        }

        // create the curves
        BarItem myCurve = myPane.AddBar("curve 1", list, Color.Blue);
        BarItem myCurve2 = myPane.AddBar("curve 2", list2, Color.Red);
        BarItem myCurve3 = myPane.AddBar("curve 3", list3, Color.Green);

        // Fill the axis background with a color gradient
        myPane.Chart.Fill = new Fill(Color.White,
           Color.FromArgb(255, 255, 166), 45.0F);

        zgc.AxisChange();

        // expand the range of the Y axis slightly to accommodate the labels
        myPane.YAxis.Scale.Max += myPane.YAxis.Scale.MajorStep;

        // Create TextObj's to provide labels for each bar
        BarItem.CreateBarLabels(myPane, false, "f0");
        //Console.ReadLine();
    }
    private void zg1_Load(object sender, EventArgs e)
    {

    }
  }
}

More update I have added zedgraphControl by adding zedgraph.dll under object relational design in toolbox of VS2013.

But, all components in my toolbox are all grayed out in VS2013.

When I ran the code, I still got an empty form.

I tried the project at http://www.codeproject.com/Articles/5431/A-flexible-charting-library-for-NET

I can get the chart even though all components in my toolbox are also all grayed out in VS2013.

Answer 1

Remove the following lines from Form1_Load and you are good to go:

Console.WriteLine("Form1_Load is called");
ZedGraph.ZedGraphControl zg1 = new ZedGraphControl();

Answer 2

I guess you didn't add the event handler to Form1_Load event in Form1's Properties window (at the right bottom of the designer window), you can either do that or move CreateChart(zg1) into Form1's constructor, like this:

    public Form1()
    {
        InitializeComponent();
        CreateChart(zg1);
    }