Re: How to free up memory - C# Discussion Boards

28-Dec-06 11:53

Alright. I got a much better idea. Simply in the designer or in the constructor set the Form's Opacity to 0 (Zero). This way it will never show up.

Regards

Re: Hide form at startup

Mike Hankey28-Dec-06 12:07

Mike Hankey

28-Dec-06 12:07

I had thought of that but seemed kludgy. But looks like that may be the only answer!

Thank you all for your input and help. I hope I can return the info in the future.

Regards
Mike

Re: Hide form at startup

dsl/fahk28-Dec-06 11:52

dsl/fahk

28-Dec-06 11:52

Have you tried making the opacity of the form 0? and then when the system tray is clicked the opacity is 100? And then you could make it slowly fade in for a cool effect.

How to free up memory

T.Willey28-Dec-06 9:45

T.Willey

28-Dec-06 9:45

I have this program I wrote that will search the entire c drive and make a treeview dialog of all the folders with the memory taken up by the folders. I can understand that this process should take up some memory, but once it finishes it should release the memory because all you are doing now is looking at the treeview which has been all filled out already with all the information that it will ever have.

I guess I'm trying to say that once the dialog comes up, how can I free some of the memory that my program has taken up? On my machine it has taken up to 30k of memory, and held it until I close it.

Here is the code. Thanks in advance for any help. If this is too much code, let me know and I will edit my post.

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

namespace MemoryManagmentDialog
{
/// <summary>
/// Description of MainForm.
/// </summary>
public class MainForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TreeView treeView1;

public static double GetDirectorySize (DirectoryInfo Di, TreeNode ParentNode, bool IsFirst) {
double DirSize = 0;
try {
FileInfo[] fiAr = Di.GetFiles ();
foreach (FileInfo fi in fiAr) {
DirSize = DirSize + fi.Length;
}
DirectoryInfo[] diAr = Di.GetDirectories();
if (IsFirst == true) {
foreach (DirectoryInfo di in diAr) {
DirSize = DirSize + GetDirectorySize (di, ParentNode, false);
}
}
else {
TreeNode SubNode = new TreeNode (Di.Name);
foreach (DirectoryInfo di in diAr) {
DirSize = DirSize + GetDirectorySize (di, SubNode, false);
}
ParentNode.Nodes.Add (SubNode);
SubNode.Text = Di.Name + " - [ " + SizeToString (DirSize, SubNode) + " ]";
}
}
catch {
TreeNode SubNode = new TreeNode (Di.Name);
ParentNode.Nodes.Add (SubNode);
SubNode.Text = Di.Name + " ** [ Error ]";
SubNode.BackColor = Color.Red;
SubNode.ForeColor = Color.White;
}
return DirSize;
}

public static string SizeToString (Double dbl, TreeNode tn) {
string Str;
if (0 <= dbl && dbl < 1000) {
Str = dbl.ToString() + " b";
tn.BackColor = Color.Orange;
return Str;
}
else if (1000 < dbl && dbl < 1000000) {
Str = (dbl / 1000).ToString() + " KB";
tn.BackColor = Color.PaleGreen;
return Str;
}
else if (1000000 < dbl && dbl < 1000000000) {
Str = (dbl / 1000000).ToString() + " MB";
tn.BackColor = Color.DeepSkyBlue;
return Str;
}
else {
Str = (dbl / 1000000000).ToString() + " GB";
tn.BackColor = Color.White;
return Str;
}
}

void MainFormLoad (object sender, System.EventArgs e) {
DirectoryInfo di = new DirectoryInfo (@"c:\");
TreeNode MainNode = new TreeNode (di.Name);
treeView1.Nodes.Add (MainNode);
double MainSize = GetDirectorySize (di, MainNode, true);
MainNode.Text = di.Name + " - [ " + SizeToString (MainSize, MainNode) + " ]";
}

public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//
}
void Button1Click(object sender, System.EventArgs e)
{
Close();
}

[STAThread]
public static void Main(string[] args)
{
Application.Run(new MainForm());
}

#region Windows Forms Designer generated code
/// <summary>
/// This method is required for Windows Forms designer support.
/// Do not change the method contents inside the source code editor. The Forms designer might
/// not be able to load this method if it was changed manually.
/// </summary>
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// treeView1
//
this.treeView1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.treeView1.ImageIndex = -1;
this.treeView1.Location = new System.Drawing.Point(0, 0);
this.treeView1.Name = "treeView1";
this.treeView1.SelectedImageIndex = -1;
this.treeView1.Size = new System.Drawing.Size(512, 280);
this.treeView1.TabIndex = 1;
//
// button1
//
this.button1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.button1.Location = new System.Drawing.Point(420, 287);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(64, 23);
this.button1.TabIndex = 0;
this.button1.Text = "Done";
this.button1.Click += new System.EventHandler(this.Button1Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.treeView1);
this.Controls.Add(this.button1);
this.DockPadding.All = 1;
this.MinimumSize = new System.Drawing.Size(250, 340);
this.Text = "Folder Memory Sizes";
this.Name = "MainForm";
this.Load += new System.EventHandler(this.MainFormLoad);
this.ResumeLayout(false);
}
#endregion
}
}

Tim

Nader Elshehabi28-Dec-06 10:52

28-Dec-06 10:52

T.Willey wrote:
the treeview which has been all filled out already with all the information that it will ever have.

Sure! And where do you think this information is stored -for repainting, etc...- until the TreeView is disposed? Big Grin | :-D

Regards

T.Willey28-Dec-06 10:56

T.Willey

28-Dec-06 10:56

I was thinking that once it was done searching the drive then it wouldn't need to consume as much memory. If I'm wrong, then I think it will be fine, I was just trying to optomise it.

Thanks again Nader. I never did get the other program you were helping me with to work, and the person I was doing it for found another way, so I stopped trying after like 7 revisions.

Tim

Nader Elshehabi28-Dec-06 11:27

28-Dec-06 11:27

T.Willey wrote:
I never did get the other program you were helping me with to work

That's bad news!! I hope you make it next time. Best wishes, and you are welcome anytime.

Regards

Luc Pattyn28-Dec-06 10:59

Luc Pattyn

28-Dec-06 10:59

In .NET you typically dont have to worry continuously about memory consumption;
objects that are in use normally stay alive, and objects that are not needed anymore,
although not deleted immediately (as would be the case with unmanaged C++ destructors),
get discarded when the garbage collector sees fit.

Also 30KB is a really small amount on most of todays systems.

It still pays off to keep memory consumption in mind when performance is important,
so one should avoid making an excessive number of objects.

I see no problems with your application; there are some strings (as in all apps),
and the FileInfo and DirectoryInfo arrays go out of scope pretty soon, so they
are collectable.

If you want to save memory, you can:
- empty collections (e.g. ListView.Clear)
- set unneeded object references to null (so they become collectible even before
they go out of scope).
Both of these of course only if your program logic allows it.

As a last resort, you could invoke the garbage collector explicitly, but in
general, this is not a good thing to do. Normally just let it do it's thing...

Smile | :)

Luc Pattyn

T.Willey28-Dec-06 11:38

T.Willey

28-Dec-06 11:38

Thanks for the heads up Luc. I write C# very infrequent, so these are nice tips to know.

Tim

Hide report viewer dialog

Vikram kshatriya28-Dec-06 18:11

Vikram kshatriya

28-Dec-06 18:11

HI,
With the try,catch and throw you can also use "finally" and within the finally block you can release the resources that have occupied memory.

thanks,
vikram

Vicky

ListView Control

Civic0628-Dec-06 8:28

Civic06

28-Dec-06 8:28

I am programatically adding items to the ListView Control. I also want to programatically scroll to the last item in the control...how do i do this?

Re: ListView Control

Luc Pattyn28-Dec-06 8:37

Luc Pattyn

28-Dec-06 8:37

try ListView.EnsureVisible()

Smile | :)

Luc Pattyn

Re: ListView Control

Civic0628-Dec-06 8:54

Civic06

28-Dec-06 8:54

Thank You so much! Smile | :)

gus_br28-Dec-06 7:39

gus_br

28-Dec-06 7:39

Hey guys,

I need to hide the VS Report (.rdlc files) print window dialog when printing (that one that shows "printing page X of Y", or something), like a silent mode. Is there any way to accomplish it? I think there's not any silent mode in this component, so i think i'll need to tweak it a little.
I'm printing a lot of reports at the same time and a lot of these windows appears to our users - and no, they don't like it. XD

Thanks for your attention...

bad, bad engRish... :/

Insert data automatically in C#

TuanNH8528-Dec-06 5:45

TuanNH85

28-Dec-06 5:45

First of all, thx for your replies. And sry about my broken english. I'm still noob Dead | X|

. But that's not my homework but a problem i wanna solve. Till now i cant find the solution. Let me make it more clearly:

1) The site i tested is: www.ou.edu.vn/diemthi. U can log onto it to check it. There are 2 textbox: ID and password. ID and password are alike for example 10300005. So i wanna build a program that inserts the ID & password automatically and submit it. The ID can be inserted from x to y such as 10300005 -> 10300008 one by one. Is there anyway i can solve this?

2) Once u click the submit button, the mark page occurs. It has a table which contains the student's marks. And i wanna get those marks to add them into my database but i dont know how. I searched in the MSDN and many e-books but still cant find any object or function that can solve it.

Any ideas for me Sigh | :sigh:

ed^nrgc28-Dec-06 6:20

ed^nrgc

28-Dec-06 6:20

An edu address, and it's not homework? hmmm.

Use Firefox and let it populate it for you.

Nader Elshehabi28-Dec-06 7:15

28-Dec-06 7:15

1) Yes there are ways to do this including commercial and freeware products, but this is called hacking, and it's illegal. You should use the page they provided to access individual records, and if you want mass transfer of data you should contact the adminstrator rather than just hack into their website -not to mention how poor a hack this way would be-.

2) Same as (1). Also MSDN is not designed to answer specific question, it's a general technical documentation that gives you guidlines and general help. You tailor that help to suit your needs. If you did look carefully you could have seen several classes dealing with Http data transfer, and this is as far as I would tell you.

Forgive my rudeness, but your request is quite unacceptable without appropriate clarification of your motives.

Regards

Eric Georgiades29-Dec-06 9:26

Eric Georgiades

29-Dec-06 9:26

teeboss wrote:
But that's not my homework but a problem i wanna solve.

hahaha
i like the way you try and "hide" what you're trying to do.