C# Discussion Boards - CodeProject

Samuel Cherinet10-Mar-09 10:08

10-Mar-09 10:08

well,
what visual studio does when storing connection strings is, it only codes the get method of the "connection string" property. this is an auto generated code,you will find it in a file called "Settings.Designer.cs"

you will find a code roughly like this

<br />
[global::System.Configuration.ApplicationScopedSettingAttribute()]<br />
        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]<br />
        [global::System.Configuration.SpecialSettingAttribute(global::System.Configuration.SpecialSetting.ConnectionString)]<br />
        [global::System.Configuration.DefaultSettingValueAttribute("Default Connetction string")]<br />
        public string Setting {<br />
            get {<br />
                return ((string)(this["Setting"]));<br />
            }<br />
//add this set method for this properit<br />
            set<br />
            {<br />
                this["Setting"] = value;<br />
            }<br />
        }<br />

delete the default connection string and assign it before trying to fill the dataset

hope it works for you,

Re: Datasets and Reports

Jacob Dixon10-Mar-09 17:26

Jacob Dixon

10-Mar-09 17:26

Sweet that looks like exactly what I needed! Thanks!

how to make network in graph topology

sunnyk8610-Mar-09 6:51

sunnyk86

10-Mar-09 6:51

how do we make a network in graph topology.

Re: how to make network in graph topology

musefan10-Mar-09 7:26

musefan

10-Mar-09 7:26

I have no idea what you are on about. Is this a network related question by any chance. i.e. wrong forum?

Life goes very fast. Tomorrow, today is already yesterday.

Combobox value

andrejmk10-Mar-09 6:31

andrejmk

10-Mar-09 6:31

Hi. Until now, I've been working only in C#, but only Web Sites. Now I tried to make something in C# for Applications and I have this problem: when you make Web Sites, you have DropDownList. In the dropdownlist I can assign a value to each member from the list and get it later with

DropDownList1.SelectedItem.Value;

With the combobox in applications I don't have the same value option. When I write

comboBox1.SelectedItem

I don't have the option to retrieve or to assign a value to the item I'm putting in the list.

I need this option for working with databases, because I fill the combobox from a database, and I want the value of the items to be the ID assigned in the database. I use Visual Studio 2008.

Re: Combobox value

Xmen Real 10-Mar-09 6:35

Xmen Real

10-Mar-09 6:35

comboBox1.SelectedValue and you have to use DataSource, DisplayMember and ValueMember.

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How to display images in subitems of a listview control using <b>C#</b>?

ADIDADPU10-Mar-09 6:22

ADIDADPU

10-Mar-09 6:22

I have a list view with 3 columns and I want to display an image in 3rd column during run time.

I've not find any direct method to do this, Then I approached DrawSubItem event. But I am not able to achieve my requirement as it is continuosly paiting.
I think I need to go for customization. But I am new to C# and I am in need of somebody's help.
Can anyone please help me in getting the solution?

Re: How to display images in subitems of a listview control using C#?

Xmen Real 10-Mar-09 6:31

Xmen Real

10-Mar-09 6:31

http://www.codeproject.com/KB/list/OAKListView.aspx[^]

How to convert html to pdf using C# tried to do but got error

YiXiang_8910-Mar-09 5:39

YiXiang_89

10-Mar-09 5:39

Hi all,

How to convert html to pdf?

I am using Itextsharp.dll as my library, cause i found 2 other library but are under License so i cant use it

i tried to follow the ExpertPDF method of geting the property but i just cant not get it to work

private PdfDocument GetPDFConverter()
{
int pageWidth = 0;
int pageHeight = 0;

PdfDocument pdfConverter = new PdfDocument(pageWidth, pageHeight); <-- (The type 'iTextSharp.text.pdf.PdfDocument' has no constructors defined)

pdfConverter.GetRight = false; <--error also

return pdfConverter;
}

How can i do it?
As i not sure how to read the data from the library

Thank You

Re: How to convert html to pdf using C# tried to do but got error

Jack Li10-Mar-09 5:57

Jack Li

10-Mar-09 5:57

http://www.codeproject.com/KB/cs/pdfizer.aspx[^]

download this file!

Re: How to convert html to pdf using C# tried to do but got error

Curtis Schlak.10-Mar-09 6:10

Curtis Schlak.

10-Mar-09 6:10

I would follow Yusuf[^]'s advice below where you posted a very similar question[^].

vSystem.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer,Int32 offset,Int32 size,SocketFlags socketflags,Endpoint& remoteEP) [modified]

mrithula810-Mar-09 4:28

mrithula8

10-Mar-09 4:28

Hi,

I'm having trouble getting the UDPClient to work with C#.
The udpClient has connected and sent a signal to 127.0.0.1 on port 8050 with no exceptions thrown. On the below line of code,

int recv = server.ReceiveFrom(data, ref tmpRemote);

I receive the below exception error,
at System.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint& remoteEP)

RemoteIPEndPoint is defined using the following line of code,

IPEndPoint sender = new IPEndPoint(IPAddress.Parse("127.0.0.1"),8050);
      EndPoint tmpRemote = (EndPoint)sender;

Any ideas why it throws the exception and how to solve it?

modified on Thursday, March 12, 2009 1:02 AM

Re: vSystem.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer,Int32 offset,Int32 size,SocketFlags socketflags,Endpoint& remoteEP)

Jimmanuel10-Mar-09 6:27

Jimmanuel

10-Mar-09 6:27

mrithula8 wrote:
Any ideas why it throws the exception and how to solve it?

Nope.

That info is contained in the SocketException object that gets thrown. You need to catch it and either print it or use the debugger to view it and find out what's going on.

Re: vSystem.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer,Int32 offset,Int32 size,SocketFlags socketflags,Endpoint& remoteEP)

mrithula811-Mar-09 19:01

mrithula8

11-Mar-09 19:01

Hi,
I used the SocketException to catch the exception
It displays the exception that the existing connection was forcibly closed by the remote host.How do i find where the connection is getting closed?Can you give some suggestions
//client

private void SendMessage()
        {
            try
            {
                listBox6.Items.Add("Connecting....");
  IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8050);
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
 sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendBuffer, 1);
              listBox6.Items.Add("Connected");
                byte[] data = new byte[1024];
                String snd = "hello";
                data = Encoding.ASCII.GetBytes(snd);
                listBox6.Items.Add("Transmitting...");
sock.SendTo(data, 0,data.Length, SocketFlags.None, ipep);//sent hello                
                listBox6.Items.Add("Sent...");
             EndPoint tmpRemote = (EndPoint)ipep;
                listBox6.Items.Add("Message received from {0}:");
                listBox6.Items.Add(ipep.ToString());
                data = new byte[1024];
  int recv = sock.ReceiveFrom(data,0,data.Length, SocketFlags.None, ref tmpRemote);
                String zz=Encoding.ASCII.GetString(data, 0, recv);
                listBox6.Items.Add(zz);
                if (zz == "Welcome to the Server")
                {
                    lb9.Text = "Active";
                    lb9.BackColor = Color.Green;
                }
                else{
                    lb9.Text = "Inactive";
                    lb9.BackColor=Color.Red;
                }            
            }

            catch (SocketException e)
            {
                //Console.WriteLine("Error..... " + e.StackTrace);
                MessageBox.Show(e.Message);

            }
        }

//server

public static void start_server()
        {
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8050);
            Socket newsock = new Socket(AddressFamily.InterNetwork , SocketType.Dgram, ProtocolType.Udp);
            newsock.Bind(ipep);
            Console.WriteLine("Waiting for a client...");
            while (true)
            {
                try
                {
                    EndPoint tmpRemote = (EndPoint)ipep;
                    byte[] data = new byte[1024];
                    Console.WriteLine("hai");
                    int recv = newsock.ReceiveFrom(data, 0, data.Length, SocketFlags.None, ref tmpRemote);
                    Console.WriteLine("gfgjfk");
      Console.WriteLine("Message received from {0}:", tmpRemote.ToString());
   Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));//hello is received  
                    String st = data.ToString();
                    data = new byte[1024];
                    string ss = "Welcome to the Server";
                    data = Encoding.ASCII.GetBytes(ss);
                    newsock.SendTo(data,0, data.Length, SocketFlags.None, tmpRemote);
                    Console.WriteLine("\nSent Acknowledgement");
                }
                catch (SocketException e)
                {
                    Console.WriteLine(e.Message);
                }
              }
        }

Re: vSystem.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer,Int32 offset,Int32 size,SocketFlags socketflags,Endpoint& remoteEP)

Jimmanuel12-Mar-09 3:28

Jimmanuel

12-Mar-09 3:28

MSDN says that you have to call Socket.Bind(...) before you call Socket.ReceiveFrom(...). I see where you're doing that in your server code but not your client. I'd try adding a call to that function to the client.

If you still have lots of problems getting Sockets to work then I'd suggest you take a look at the UdpClient[^] class. It simplifies a lot of things and makes sockets easier to work with.

Re: vSystem.Net.Sockets.Socket.ReceiveFrom(Byte[] buffer,Int32 offset,Int32 size,SocketFlags socketflags,Endpoint& remoteEP)

mcldev10-Mar-09 10:32

mcldev

10-Mar-09 10:32

Your exception is probably something to do with the buffer, offset, and size. here are some guidelines that may help you understand and solve your problem:

The "buffer" must be large enough to accomodate the largest UDP datagram you expect to receive. Make sure you have a buffer that is large enough for you application. For example byte[] buffer = new buffer[1024];

Next, "offset" is the index to the buffer. First recv this is probably zero (0). Next recv it may be advanced by the value from the datagram PDU, e.g. a size of payload. The key here is offet MUST be with the bounds of the buffer 0 to n.
You should advance the offset by the bytes recv'd like this (with error checking of ocurse):

int nbytes = recv(buffer, offset, size, ...);
offset += nbytes

"Size" is determines how much. Let's say your first read got a 12 byte Header and in this header you extract a length. Well that means you would have used 12 for the first recv, and the if the payload size from the Header was 146 bytes, then your second recv would be for that amount. BUT you must make sure the offset advances before the second recv. Make sure you process recv errors, such as:

int nbytes = recv(buffer, offset, size, ...);

if (nbytes > 0)
   offset += nbytes;
else
   ProcessSocketError();

Good luck

Can't use base canvas as event dispatcher?

emptythetill10-Mar-09 3:50

emptythetill

10-Mar-09 3:50

Hello.

I'm trying to get an object to go where a mouse click occurs, my XAML:

<pre><Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="bricksMenu.Window1"
x:Name="Window"
Title="Window1"
Width="640" Height="480" Background="Black">

<Canvas Name="baseCanvas" MouseDown="baseCanvas_MouseDown">
<Canvas Name="whiteSquare" Width="50" Height="50" Background="White" Canvas.Left="25" Canvas.Top="25"/>
<Canvas Name="redSquare" Width="50" Height="50" Background="Red" Canvas.Left="50" Canvas.Top="50"/>
</Canvas>
</Window></pre>

and the C Sharp behind:

<pre>namespace bricksMenu
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{

public Window1()
{
this.InitializeComponent();

// Insert code required on object creation below this point.
}

private void baseCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
double mouseX;
double mouseY;
Point position = e.GetPosition(this);
mouseX = position.X;
mouseY = position.Y;
DoubleAnimation followMouseX = new DoubleAnimation(mouseX, TimeSpan.FromMilliseconds(600));
DoubleAnimation followMouseY = new DoubleAnimation(mouseY, TimeSpan.FromMilliseconds(600));
redSquare.BeginAnimation(Canvas.LeftProperty, followMouseX);
redSquare.BeginAnimation(Canvas.TopProperty, followMouseY);
}
}
}</pre>

The idea is you click on the black background, the red square goes to that point. However, I need to click on the red sqaure to make anything happen, even though the event dispatcher is not on that canvas. Any ideas?

Regards, E.

Re: Can't use base canvas as event dispatcher?

emptythetill10-Mar-09 5:28

emptythetill

10-Mar-09 5:28

I fixed it myself by simply adding a stage sized canvas into the main canvas.

Advice on Next Step

TheScientistIsDead10-Mar-09 3:47

TheScientistIsDead

10-Mar-09 3:47

As a modestly skilled C++ programmer, would C# be my logical next step ?(when I say "next step", I mean in terms of learning another language, in this case specifically one I can use for scripting).

As I am just being introduced, really, to Web programming, I'm not really sure I should be learning ASP.NET yet, my thinking being that lower-level scripting is a prerequisite for this.

Would C# be appropriate?

Re: Advice on Next Step

Xmen Real 10-Mar-09 3:54

Xmen Real

10-Mar-09 3:54

http://www.google.com/search?client=opera&rls=en&q=C%23+advantages&sourceid=opera&ie=utf-8&oe=utf-8[^]

Re: Advice on Next Step

Curtis Schlak.10-Mar-09 5:43

Curtis Schlak.

10-Mar-09 5:43

Opera? Good to see someone is still using it!

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Advice on Next Step

Xmen Real 10-Mar-09 6:29

Xmen Real

10-Mar-09 6:29

Opera is best[^]

need help on C# ITEXT - Convert html to pdf

YiXiang_8910-Mar-09 3:42

YiXiang_89

10-Mar-09 3:42

hi all,
This is what i found on the web

public static PdfFileSpecification fileEmbedded(PdfWriter writer,String filePath,String fileDisplay,
byte[] fileStore,int compressionLevel)
{
Parameters:
writer - the PdfWriter
filePath - the file path
fileDisplay - the file information that is presented to the user
fileStore - the byte array with the file. If it is not null
compressionLevel - the compression level to be used for compressing the file it takes precedence over filePath

} <---- what to type inside?

So this help to transfer the html that have been converted to pdf to store inside a file ?

does anyone know how to convert html to pdf using C#?
Cause the web i find are about java

Thank you

Re: need help on C# ITEXT - Convert html to pdf

Yusuf10-Mar-09 3:46

Yusuf

10-Mar-09 3:46

YiXiang_89 wrote:
Cause the web i find are about java

well, did you look into the java code. If you know C#, it should not be that hard to understand the java code.

Yusuf

Oh didn't you notice, analogous to square roots, they recently introduced rectangular, circular, and diamond roots to determine the size of the corresponding shapes when given the area. Luc Pattyn[^]

ActiveFomr.Invoke

thomaxz.tc10-Mar-09 3:35

thomaxz.tc

10-Mar-09 3:35

I have a main form, from which i recive data from an usb hid device, i work fine

In my my main form i have th code

Form.ActiveForm.Invoke(new BuzzCmdDelegate(BuzzCmd),new object[] {1,1});

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.