C#

<asp:Chart ID="Chart1" runat="server" Height="339px" Width="896px"

Chart1 is a Chart ID. Actually there is no error, but the graph is not display line graph as what I want. It will display all data in database but I just want to display data from 30 minutes only. Do you know in this forum there is function to attach picture? so u can see clearly what I want to explain.Tq

Syafiqah Zahirah wrote:

TempInTextBox.Text = dr.GetValue(0).ToString();
TempOutTextBox.Text = dr.GetValue(1).ToString();
HumidTextBox.Text = dr.GetValue(2).ToString();
Chart1.Series["TempIn"].Points.AddXY(DateTime.Now.ToShortTimeString(), Double.Parse(TempInTextBox.Text));
Chart1.Series["TempOut"].Points.AddXY(DateTime.Now.ToShortTimeString(), Double.Parse(TempOutTextBox.Text));
Chart1.Series["Humidity"].Points.AddXY(DateTime.Now.ToShortTimeString(), Double.Parse(HumidTextBox.Text));

double tempIn = dr.GetDouble(0);
Chart1.Series["TempIn"].Points.AddXY(DateTime.Now.ToShortTimeString(), tempIn);

while (dr.Read())
                      {
                          double tempIn = dr.GetDouble(0);
                          double tempOut = dr.GetDouble(1);
                          double humidity = dr.GetDouble(2);
                          double date = dr.GetDouble(3);

                         DateTime? value = (DateTime?)dr["DateT"];

                       Chart1.Series["TempIn"].Points.AddXY(value, tempIn);
                       Chart1.Series["TempOut"].Points.AddXY(value tempOut);
                       Chart1.Series["Humidity"].Points.AddXY(value, humidity);
                       Chart1.ChartAreas["ChartArea1"].Area3DStyle.Enable3D = true;

<pre>/*I using the code below only for a basic example. Being that I am reading large files, how could I modify this code to only do "block read" in lumps of 64k at a time?*/ 
using System;
using System.IO;
using System.Collections;

namespace Applica
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo da = new DirectoryInfo("C:\\Folder");
            FileInfo[] Arr = da.GetFiles();
            if (Arr.Length == 0)
            {
                throw new InvalidOperationException("No files found.");
            }
            FileInfo ap = Arr[Arr.Length - 1];
            long Totbyte = ap.Length;
            string filePath = ap.FullName;
            string temPath = Path.GetTempFileName();
            byte[] data = File.ReadAllBytes(filePath);
            File.WriteAllBytes(temPath, data);
            decimal[] arry = new decimal[Totbyte];
            for (int count = 0; count < data.Length; count++)
            {
                arry[count] = data[count];
            }
            byte[] data2 = new byte[Totbyte];
            for (int count = 0; count < arry.Length; count++)
            {
                data2[count] = (byte)arry[count];
            }
            string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
            File.WriteAllBytes(filePath2, data2);
            data = File.ReadAllBytes(temPath);
            data2 = File.ReadAllBytes(filePath);
        }
    }
}

GrooverFromHolland wrote:

They both do the job, but what is better

  1  using System;
  2  using System.Collections.Generic;
  3  using System.Linq;
  4  using System.Text;
  5  using System.Windows.Forms;
  6  using System.Threading.Tasks;
  7  
  8  namespace ConsoleApplication2
  9  {
 10      class Program
 11      {
 12          static void Main()
 13          {
 14              System.Threading.Thread.CurrentThread.Name = "Main thread";
 15              using (var f = new SomeForm())
 16                  f.ShowDialog();
 17          }
 18      }
 19      class SomeDataCollection : List<Guid> { }
 20      class SomeForm: Form
 21      {
 22          ListBox _listBox1;
 23          Button _button1;
 24          public SomeForm()
 25          {
 26              _listBox1 = new ListBox() { Dock = DockStyle.Fill };
 27              _button1 = new Button() { Dock = DockStyle.Top };
 28              Controls.AddRange(new Control[] { _listBox1, _button1 });
 29  
 30              _button1.Click += delegate
 31              {
 32                  Task Tf2 = Task.Factory.StartNew(() =>
 33                  {
 34                      SomeDataCollection _data = getData();
 35                      showData(_data);
 36                  });
 37              };
 38          }
 39          void showData(IList<Guid> whatData)
 40          {
 41              if (InvokeRequired)
 42              {
 43                  Invoke(new Action<SomeDataCollection>(showData), new[] { whatData });
 44                  return;
 45              }
 46  
 47              _listBox1.DataSource = whatData;
 48          }
 49          SomeDataCollection getData()
 50          {
 51              var result = new SomeDataCollection();
 52              for (int i = 0; i < 10; i++)
 53              {
 54                  result.Add(Guid.NewGuid());
 55                  System.Threading.Thread.Sleep(150);
 56              }
 57              return result;
 58          }
 59      }
 60  }

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]