C# Discussion Boards - CodeProject

Re: Client/Server Disconnection

6-Nov-07 8:09

TCP/IP disconnect is based on timeout, which is set by the OS as a default of 30 minutes. (Or was back when I wrote winsocks). Disconnected network sockets were always then bane of my existence. However, if you are doing async reads and writes is should be that big of a server issue. Just leave the connections till they timeout or set the timeout to be really low on the server and use keep alive.

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jlgeris6-Nov-07 8:33

jlgeris

6-Nov-07 8:33

well, my problem is that i don't want to attempt to send data to the disconnected clients every iteration. i'd like to remove them from the Client collection without phasing the server. thanks for the response.

Re-use code

simsen6-Nov-07 7:28

6-Nov-07 7:28

Hi,

I have the below code in a cs file (and it function perfect). But I know, I have to use that code in other files two. So I want to place the code in a Class file (cs file in App_Code dir).

I don't know what I shall do, so I can re-use the code in all the files I want. Can anyone show by example what to do - and how I use ind a file?

My code:

public String sortExpression<br />
    {<br />
        get<br />
        {<br />
            if (ViewState["sortExpression"] == null)<br />
            {<br />
                ViewState["sortExpression"] = Convert.ToString(grdEmployeeList.Columns[0].SortExpression);<br />
            }<br />
            return Convert.ToString(ViewState["sortExpression"]);<br />
        }<br />
        set<br />
        {<br />
            ViewState["sortExpression"] = value;<br />
        }<br />
    }

If I put the code directly into the Class file, I get an error, that ViewState is unknown.....

Kind regards,
simsen Smile | :)

Re: Re-use code

half-life6-Nov-07 7:42

half-life

6-Nov-07 7:42

I don't know what is a ViewState

But i know it belongs to refrence( using ...)

Maybe u forgat it.

Have Fun
Never forget it

Re: Re-use code

Kristian Sixhøj6-Nov-07 7:44

Kristian Sixhøj

6-Nov-07 7:44

You need to add a using statement at the top of your new program,
that refers to the namespace which ViewState belongs to.

Kristian Sixhoej

"Any fool can learn from his own mistakes, but a wise man learns from mistakes of others"

Re: Re-use code

simsen6-Nov-07 9:35

6-Nov-07 9:35

Hi Kristian,

Microsoft sais that the namespace are UI, and I have that namespace in the using statements. So I have no clue, what to do?

using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
using System.Drawing;<br />
<br />
/// <summary><br />
/// Summary description for ERSGridView<br />
/// </summary><br />
public class ERSGridView<br />
{

A few things

Ennis Ray Lynch, Jr.6-Nov-07 8:14

6-Nov-07 8:14

1) ViewState is serialized and can contain serializable types. Do not convert to string. Use: ViewState["w/e"] = someObject directly.

2) Create a base page that inherits from page then you can reuse the code.

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Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway

simsen6-Nov-07 9:38

6-Nov-07 9:38

Hi Ennis,

How do I create a base page that inherits from page. I now tried to search at google, and I cann't figure out to replace the expamples with my code?

Ennis Ray Lynch, Jr.6-Nov-07 9:42

6-Nov-07 9:42

in App_Code:

public class MyPageBase : System.Web.UI.Page {

    public string ViewStateItem{
        get{
            return (string)ViewState["someViewStateItem"];
        }
        set{
            ViewState["someViewStateItem"] = value;
        }
    }
}

In your Web project

public class SomeWebPage : MyPageBase { ... }

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simsen6-Nov-07 10:00

6-Nov-07 10:00

I copied the same code into a new file I called ERSBasePage and I gets the same error here to.....

my ERSBasePage.cs file:

using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
<br />
/// <summary><br />
/// Summary description for ERSPageBase<br />
/// </summary><br />
public class ERSPageBase<br />
{<br />
	public ERSPageBase()<br />
	{<br />
		//<br />
		// TODO: Add constructor logic here<br />
		//<br />
	}<br />
    public string ViewStateItem <br />
    { <br />
        get { return (string)ViewState["someViewStateItem"]; } <br />
        set { ViewState["someViewStateItem"] = value; } <br />
    }<br />
}

And the page where I want to inherith:

public partial class ERS_Adm_AdmFrontPage : ERSPageBase<br />
{<br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {

The error sais:

Error 1 The name 'ViewState' does not exist in the current context C:\Inetpub\wwwroot\ANSI\App_Code\ERSPageBase.cs 24 30 C:\...\ANSI\

As you can see, I am using the page directive UI as I read I shall use regarding ViewState

Ennis Ray Lynch, Jr.6-Nov-07 10:54

TreeView.SelectedNode.FullPath problem

6-Nov-07 10:54

Look really close at your definition of ERSPageBase. There is something missing that is not missing from my sample.

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Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway

gerbenschmidt6-Nov-07 7:10

gerbenschmidt

6-Nov-07 7:10

Hi,

I have a form which must act like a custom directory browser.
Now my code has one NodeMouseClick event which is handling 2 actions when selecting a TreeView Node:

1)Build the Items for the ListView (this works)
2)Show the Full path of the Selected Node in a StatusBar

In my Code 2) (bold lines) returns the path of the previous clicked Node!!!....Has anyone an idea what is wrong??

  // This is the Projects Path which is set in the Menu_Settings.cs file (an application setting)<br />
        string sProjectsPath = global::Offshore_Supports_Menu.Properties.Settings.Default.Projects_Dir;<br />
<br />
        // This "10.0159 Ormen Lange"; is based on the Project "Number & Name" filled in the "New Project" forms.<br />
        // The "New Project" forms should store the user input data in somekind of project file. like an *.INI file<br />
        // This *.INI file is loaded into the ProjectWindow.cs to view a custom explorer of the existing<br />
        // or new generated typical project directory tree.<br />
        // For testing purposes I typed a directory name "10.0159 Ormen Lange";<br />
        // but it should be inserted from the *.INI file<br />
        string sProject = "10.3459 Ormen Lange II";<br />
<br />
        private void PopulateTreeView()<br />
        {<br />
            //The Project Directory Root Folder to begin the TreeView<br />
            TreeNode rootNode;<br />
            DirectoryInfo ProjectPath = new DirectoryInfo(sProjectsPath + "\\" + sProject);<br />
            if (ProjectPath.Exists)<br />
            {<br />
                rootNode = new TreeNode(ProjectPath.Name);<br />
                rootNode.Tag = ProjectPath;<br />
                rootNode.ImageIndex = 2;<br />
                rootNode.SelectedImageIndex = 2;<br />
                GetDirectories(ProjectPath.GetDirectories(), rootNode);<br />
                ProjectTreeView.Nodes.Add(rootNode);<br />
                rootNode.Expand();<br />
                StatusLabel1.Text = ProjectPath.ToString();<br />
            }<br />
        }<br />
<br />
        void ProjectTreeView_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)<br />
        {<br />
            TreeNode newSelected = e.Node;<br />
            ProjectListView.Items.Clear();<br />
            DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;<br />
            ListViewItem.ListViewSubItem[] subItems;<br />
            ListViewItem item = null;<br />
<br />
<br />
            if (ProjectTreeView.SelectedNode.IsSelected == true)<br />
            {<br />
               StatusLabel1.Text = sProjectsPath + "\\" + ProjectTreeView.SelectedNode.FullPath;<br />
            }  <br />
          <br />
            //ListView items are folders<br />
            foreach (DirectoryInfo dir in nodeDirInfo.GetDirectories())<br />
            {<br />
                item = new ListViewItem(dir.Name, 1);<br />
                subItems = new ListViewItem.ListViewSubItem[]<br />
	  		             { new ListViewItem.ListViewSubItem(item, ""), <br />
			               new ListViewItem.ListViewSubItem(item, "File Folder"),<br />
			               new ListViewItem.ListViewSubItem(item, dir.LastAccessTime.ToShortDateString())};<br />
<br />
                item.SubItems.AddRange(subItems);<br />
                ProjectListView.Items.Add(item);<br />
            }<br />
<br />
<br />
            //ListView items are files<br />
            foreach (FileInfo file in nodeDirInfo.GetFiles())<br />
            {<br />
                item = new ListViewItem(file.Name, 2);<br />
                subItems = new ListViewItem.ListViewSubItem[]<br />
			              {new ListViewItem.ListViewSubItem(item, file.Length.ToString()),<br />
                           new ListViewItem.ListViewSubItem(item, "File"),<br />
			               new ListViewItem.ListViewSubItem (item, file.LastAccessTime.ToShortDateString())};<br />
                item.SubItems.AddRange(subItems);<br />
                ProjectListView.Items.Add(item);<br />
            }<br />
<br />
            ProjectListView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);<br />
        }

Re: TreeView.SelectedNode.FullPath problem

Alan N6-Nov-07 8:24

Alan N

6-Nov-07 8:24

Hi,
I suggest that you read through the full list of events that are available for the treeview control. There are so many it can be difficult to choose the correct one for any given situation but once you realise that the mouse events aren't needed for simple navigation and selection then you'll be on your way.

The click event is the one of the first to arrive and is at too low a level for your requirement. Instead respond to the AfterSelect event which arrives only after the node you want is fully selected.

When your code responds to the NodeMouseClick event the node you have just clicked is not yet selected which is why SelectedNode gets what appears to be the previous node. The eventargs e.Node which you pick up as newSelected will refer to the clicked upon node but like I said respond to AfterSelect and your code will do what you want it to.

One last thing, SelectedNode.IsSelected == true, can be removed from your code as by definition the SelectedNode is selected. OK I'm just being picky, you probably put that in to try and figure what had gone wrong!

Hope that helps, Alan.

Re: TreeView.SelectedNode.FullPath problem

gerbenschmidt6-Nov-07 12:44

gerbenschmidt

6-Nov-07 12:44

Thanx man!.....great help....

Question about midi?

Alphacore6-Nov-07 6:30

Alphacore

6-Nov-07 6:30

Hello I'm designing a program that takes plain text froma textbox and converts it into midi
any one know how i get it to read the textbox and make this conversion?

I want to assign a letter from the alphabet to a midi note
example A = middle C

thank you any help be great..

Alphacore

specify the number of users in XP Pro sp2

NvN>C6-Nov-07 6:08

NvN>C

6-Nov-07 6:08

Can I specify the number of users if I am hosting a web app in a Local system in a intranet

Sys Config:
OS:XP Pro Sp2
Ram:1GB
.Net framework:2.0
Language:VB.net
Tool used: Visual Studio 2005

If yes please specify...

NvN

Re: specify the number of users in XP Pro sp2

Guffa6-Nov-07 6:17

Guffa

6-Nov-07 6:17

No, as this is not a server version of Windows, the IIS is limited to ten users.

IIRC, you can hack the registry so that IIS allows 39 users, but above that the system becomes instable.

Experience is the sum of all the mistakes you have done.

Add/Remove Windows Fonts Programmatically

batanglasang6-Nov-07 5:15

batanglasang

6-Nov-07 5:15

Hi All,

I am working on project that involves adding/removing fonts in Windows\Fonts, I already tried the follwing steps programmatically:

1. Delete from registry

regkey = Registry.LocalMachine.OpenSubKey("SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts", True)

regkey.DeleteValue(s)

2. Delete from C:\Windows\Fonts\

Above steps does not work, it only removes the entry of the font in the registry but I was not able to delete the fonts in C:\Windows\Fonts\

Any Idea how to solve this problem of mine? any help will surely be appreciated Smile | :)

led mike6-Nov-07 5:30

led mike

6-Nov-07 5:30

batanglasang wrote:
I already tried the follwing steps programmatically:

Where did you get that approach from? Are you working from some book, article or example?

batanglasang wrote:
Any Idea how to solve this problem of mine?

I generally try to solve problems by consulting the documentation[^]

batanglasang6-Nov-07 6:37

batanglasang

6-Nov-07 6:37

I got it from an article in the web, I forget exactly where. Can you show me some codes on how to do this?

Thanks!

Thanks/Regards
Sidney

batanglasang6-Nov-07 7:01

batanglasang

6-Nov-07 7:01

I tried calling the API you suggested, but it's still not working Frown | :(

Please help me, can you show me some codes? I am trying to delete Windows\Fonts not font resources in a project but the actual fonts in the C:\windows\fonts.

Thanks

Thanks/Regards
Sidney