📄 postback.aspx
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<%@ Page Language="VB" Debug="True" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<script runat="server">
'This sample demonstrates how to use the reloaded data during the post back request.
Sub Page_Load(sender As [Object], e As EventArgs)
If Page.IsPostBack = False Then
UserID.Text = Guid.NewGuid().ToString()
CreateChart()
Else
'use the old image
Dim chartImage As New System.Web.UI.WebControls.Image()
chartImage.ID = "PostBackChart"
Dim basePath As String = Request.Path
basePath = basePath.Substring(0, basePath.LastIndexOf("/"))
chartImage.ImageUrl = basePath + "/temp/chart" + UserID.Text + ".png"
chartHolder.Controls.Add(chartImage)
End If
End Sub 'Page_Load
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 1 To 4
Dim s As New Series()
s.Name = "Series " + a.ToString()
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Element " + b.ToString()
e.YValue = 25 + myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
' Set Different Colors for our Series
SC(0).DefaultElement.Color = Color.FromArgb(49, 255, 49)
SC(1).DefaultElement.Color = Color.FromArgb(255, 255, 0)
SC(2).DefaultElement.Color = Color.FromArgb(255, 99, 49)
SC(3).DefaultElement.Color = Color.FromArgb(0, 156, 255)
Return SC
End Function 'getRandomData
Sub CreateChart()
Dim myChart As New dotnetCHARTING.Chart()
myChart.Size = "600x350"
myChart.TempDirectory = "temp"
myChart.FileName = "chart" + UserID.Text
myChart.DisableBrowserCache = False
' Set the title.
myChart.Title = "My Chart"
' Set the x axis label
myChart.ChartArea.XAxis.Label.Text = "X Axis Label"
' Set the y axis label
myChart.ChartArea.YAxis.Label.Text = "Y Axis Label"
' Set the bar shading effect
myChart.ShadingEffect = True
' Add the random data.
myChart.SeriesCollection.Add(getRandomData())
chartHolder.Controls.Add(myChart)
End Sub 'CreateChart
</script>
<html>
<head>
<title>Postback Sample</title>
</head>
<body>
<center>
<form id="postback" action="postback.aspx" runat="server">
<asp:TextBox Visible="False" id="UserID" runat="server"></asp:TextBox>
<table>
<tr><td>
<asp:PlaceHolder ID="chartHolder" Runat="server" ></asp:PlaceHolder>
</tr></td>
<tr><td align="center">
<asp:Button Text="Get Chart" Runat=server/>
</tr></td>
</form>
</table>
</center>
</body>
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