I have a chart refreshing every 1000 seconds from an timer control. I have done some searching and I think my chart is trying to redraw every update. I want to know if I am coding this right with my database querying or is there a better way to avoid the flicker?
HTML
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Chart2.aspx.cs" Inherits="Chart2" %><%@ Register Assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head><title>ChartTitle</title><link media="all" href="samples.css" type="text/css" rel="stylesheet"/></head><body><form id="Form1" method="post" runat="server"><asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><table class="sampleTable"><tr><td class="tdchart" style="width:412px"><asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"><ContentTemplate><asp:Chart id="Chart3" runat="server" Palette="BrightPastel" BackColor="#FFFFFF" ImageType="Png" ImageLocation="~/TempImages/ChartPic_#SEQ(300,3)" Width="812px" Height="596px" BorderlineDashStyle="NotSet" BackGradientStyle="TopBottom" BorderWidth="0" BorderColor="26, 59, 105" EnableViewState="true"><titles><asp:Title ShadowColor="32, 0, 0, 0" Font="Trebuchet MS, 14.25pt, style=Bold" ShadowOffset="3" Text="Overall Score" ForeColor="26, 59, 105"></asp:Title></titles><legends><asp:Legend Enabled="False" IsTextAutoFit="False" Name="Default" BackColor="Transparent" Font="Trebuchet MS, 8.25pt, style=Bold"></asp:Legend></legends><series><asp:Series ChartArea="ChartArea1" Name="Series1" BorderColor="180, 26, 59, 105" Color="220, 65, 140, 240"></asp:Series></series><chartareas><asp:ChartArea Name="ChartArea1" BorderColor="64, 64, 64, 64" BackSecondaryColor="Transparent" BackColor="64, 165, 191, 228" ShadowColor="Transparent" BackGradientStyle="TopBottom"><area3dstyle Rotation="10" Perspective="10" Enable3D="True" Inclination="15" IsRightAngleAxes="False" WallWidth="0" IsClustered="False" /><axisy LineColor="64, 64, 64, 64"><ScaleView Size="100" /><LabelStyle Font="Trebuchet MS, 8.25pt, style=Bold" /><MajorGrid LineColor="64, 64, 64, 64" /></axisy><axisx LineColor="64, 64, 64, 64"><LabelStyle Font="Trebuchet MS, 8.25pt, style=Bold" /><MajorGrid LineColor="64, 64, 64, 64" /></axisx></asp:ChartArea></chartareas></asp:Chart></ContentTemplate><Triggers><asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /></Triggers></asp:UpdatePanel><asp:UpdatePanel ID="upTimer" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false"><ContentTemplate><asp:Timer ID="Timer1" runat="server" Interval="1000" ontick="Timer1_Tick"></asp:Timer></ContentTemplate></asp:UpdatePanel></td></tr></table></form></body></HTML>Code Behind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.DataVisualization.Charting;
public partial class Chart2 : System.Web.UI.Page
{
protected String strConnectionString = (string)System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
protected String strUserID = "0";
protected String strType = "0";
protected void Page_Load(object sender, System.EventArgs e)
{
if (IsPostBack)
{
}
else
{
Chart3.ChartAreas[0].Area3DStyle.LightStyle = LightStyle.Realistic;
getData(true);
}
}
protected void getData(bool bolValue)
{
String strQueryString = Request.QueryString.ToString();
if (strQueryString.IndexOf("Type") >= 0)
{
strType = Request["Type"].ToString();
}
int i = 0;
string strQuery;
//SQL Query
strQuery = "EXEC sp_Report 1, 5, " + strType + ", 0, 'xyz'";
SqlConnection cnn = new SqlConnection(strConnectionString);
SqlCommand cmd = new SqlCommand(strQuery, cnn);
cmd.Parameters.Add(new SqlParameter("@UserID", SqlDbType.Int));
cmd.Parameters["@UserID"].Value = Int32.Parse(strUserID);
cmd.Connection.Open();
IDataReader reader = cmd.ExecuteReader();
//Iterate through each factory
while (reader.Read())
{
if (bolValue == true)
{
Chart3.Series["Series1"].Points.AddY(reader["Pct"]);
}
else
{
Chart3.Series["Series1"].Points[i].SetValueY(reader["Pct"]);
}
Chart3.Series["Series1"].Points[i].AxisLabel = reader["DisplayLabel"].ToString();
Chart3.Series["Series1"].Points[i].Label = reader["Pct"].ToString() + "%";
i++;
}
}
protected void Timer1_Tick(object sender, EventArgs e)
{
getData(false);
}
}