first step in C# - C# Discussion Boards

OK-

I haven't taken the time to comb through the code and find what I was doing wrong. With all the arrays flying around, I suspect I just used the wrong variable somewhere.

The following code works. So it's there for anybody who wants a simple method for encrypting/decrypting byte arrays. It's hard to find examples that aren't written for the writing-an-encrypted-file-to-disk crowd.

Bear in mind that hard coding the key and IV theoretically leaves you open to some hacker reverse engineering your code and being able to easily decrypt your files. But my personal feeling on this matter is that it's infinitely more likely that a user will compromise security by leaving their password on a sticky note stuck to their monitor. And I'm not securing highly sensitive material anyway. If you have a need for greater security, use some other method for generating and keeping track of your keys and IV's.

<br />
public byte[] EncryptStream(byte[] input)<br />
		{<br />
			RijndaelManaged rijn = new RijndaelManaged();			<br />
			byte[] encrypted;			<br />
		<br />
			byte[] key = new byte[]{0x22,0xc0,0x6d,0xcb,0x23,0xa6,0x3,0x1b,0x5a,0x1d,0xd3,<br />
                               0x9f,0x85,0xd,0xc1,0x72,0xed,0xf4,0x54,0xe6,0xba,0x65,<br />
                               0xc,0x22,0x62,0xbe,0xf3,0xec,0x14,0x81,0xa8,0xa};//32<br />
			byte[] IV = new byte[]{0x43,0xb1,0x93,0xb,0x1a,0x87,0x52,0x62,0xfb,0x8,0xd,0xc0,<br />
                              0xca,0x40,0xc2,0xdb};//16<br />
<br />
			//Get an encryptor.<br />
			ICryptoTransform encryptor = rijn.CreateEncryptor(key, IV);<br />
            <br />
			//Encrypt the data.<br />
			MemoryStream msEncrypt = new MemoryStream();<br />
			CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);<br />
			<br />
<br />
			//Write all data to the crypto stream and flush it.<br />
			csEncrypt.Write(input, 0, input.Length);<br />
			csEncrypt.FlushFinalBlock();<br />
			csEncrypt.Close();<br />
<br />
			//Get encrypted array of bytes.<br />
			encrypted = msEncrypt.ToArray();			<br />
<br />
			return encrypted;<br />
			<br />
		}<br />
		<br />
		public byte[] DecryptStream(byte[] encrypted)<br />
		{<br />
			RijndaelManaged myRijndael = new RijndaelManaged();			<br />
			byte[] fromEncrypt;			<br />
			byte[] key = new byte[]{0x22,0xc0,0x6d,0xcb,0x23,0xa6,0x3,0x1b,0x5a,0x1d,0xd3,<br />
															 0x9f,0x85,0xd,0xc1,0x72,0xed,0xf4,0x54,0xe6,0xba,0x65,<br />
															 0xc,0x22,0x62,0xbe,0xf3,0xec,0x14,0x81,0xa8,0xa};//32<br />
			byte[] IV = new byte[]{0x43,0xb1,0x93,0xb,0x1a,0x87,0x52,0x62,0xfb,0x8,0xd,0xc0,<br />
															0xca,0x40,0xc2,0xdb};//16	<br />
				<br />
			<br />
<br />
			//Get a decryptor that uses the same key and IV as the encryptor.<br />
			ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, IV);<br />
<br />
			//Now decrypt the previously encrypted message using the decryptor<br />
			// obtained in the above step.<br />
			MemoryStream msDecrypt = new MemoryStream(encrypted);<br />
			CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);<br />
<br />
			fromEncrypt = new byte[encrypted.Length];<br />
<br />
			//Read the data out of the crypto stream.<br />
			csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);<br />
<br />
			//Convert the byte array back into a string.<br />
			//roundtrip = textConverter.GetString(fromEncrypt);<br />
			return fromEncrypt;<br />
		}<br />

enjoy-
chlock

Hi,

I have a tool bar in my app, from which the user can drag components on to the a form. This works fine except that after dragging a control from the toolbar, once the mouse leaves the tool bar area the corresponding button remains in pressed state and will not become normal until the mouse is brought back on the tool bar. I want the button to become normal as soon as the mouse is release(on the form or elsewhere!)

Any ideas?

Thanks

I'll ask the obvious... Check if the button type is a toggle sytle.

-------------------------------
Joan
MomComputerGeek.com

This happens even with button style being set to either toggle or pushbutton

I have a C# Windows form app with its own installer... I'd like the installer to create several empty subfolders below the install dir that will hold data that will be created by the app... how can this be done...??

thanks,

vince

Why not just have the app check if the folder exists upon startup and create it if it does not exist? That way, users can delete the folders, and the application will not break.

thanks for the reply... as it turns out, that's exactly what I ended up doing

hello
i starting learning a c# and i am in my first step.
i find an exemple who talk about spliting a windows and i tryed to exucute but i acount a problem the sample don't work and i have many error .
i want to know the step to do to creat a project for this sample.

<br />
using System;<br />
using System.Drawing;<br />
using System.Windows.Forms;<br />
<br />
<br />
<br />
public class UnPanelUnSplitter : Form<br />
{<br />
	private Splitter splitter1;<br />
	private Panel panel1;<br />
<br />
<br />
	public UnPanelUnSplitter()<br />
	{<br />
		InitializeComponent();<br />
	}<br />
<br />
<br />
	private void InitializeComponent()<br />
	{<br />
		this.splitter1 = new Splitter();<br />
		this.panel1 = new Panel();<br />
		this.SuspendLayout();<br />
		// <br />
		// splitter1<br />
		// <br />
		this.splitter1.Dock = System.Windows.Forms.DockStyle.Left;<br />
		// <br />
		// panel1<br />
		// <br />
		this.panel1.BackColor = System.Drawing.Color.Yellow;<br />
		this.panel1.Dock = System.Windows.Forms.DockStyle.Left;<br />
		this.panel1.Resize += new EventHandler(PanelOnResize);<br />
		this.panel1.Paint += new PaintEventHandler(PanelOnPaint);<br />
		// <br />
		// Fenêtre UnPanelUnSplitter<br />
		// <br />
		this.BackColor = System.Drawing.Color.Red;<br />
		this.ClientSize = new System.Drawing.Size(319, 322);<br />
		this.Controls.AddRange(new System.Windows.Forms.Control[] {<br />
						  this.splitter1,<br />
						  this.panel1});<br />
		this.Text = "Un panel avec un splitter";<br />
		this.ResumeLayout(false);<br />
		this.Resize += new EventHandler(PanelOnResize);<br />
		this.Paint += new PaintEventHandler(PanelOnPaint);<br />
<br />
	}<br />
<br />
<br />
<br />
	static void Main() <br />
	{<br />
		Application.Run(new UnPanelUnSplitter());<br />
	}<br />
<br />
<br />
<br />
<br />
	void PanelOnResize(object o, EventArgs e)<br />
	{<br />
		Control control = (Control)o;<br />
		control.Invalidate();			<br />
	}<br />
<br />
<br />
	void PanelOnPaint(object o, PaintEventArgs args)<br />
	{<br />
		Control panel = (Control)o;<br />
		Graphics grfx = args.Graphics;<br />
		grfx.DrawLine(Pens.Black, 0, 0, panel.Width-1, panel.Height-1);<br />
		grfx.DrawLine(Pens.Black, panel.Width-1, 0, 0, panel.Height-1);<br />
		grfx.DrawEllipse(Pens.Black, 0, 0, panel.Width-1, panel.Height-1);<br />
	}<br />
}<br />

hi !

i tried this little sample and it worked fine. (apart from the fakt that it doesn't look very pretty)

A)
start your editor
paste the code
save it as "split.cs"
compile at "VisualStudio .Net 2003 COMMAND PROMPT" with "csc split.cs"
run it: split.exe

-- or --

B)
make a new c# project. -> windows application
replace the code of Form1.cs with your code. run it.

if you have still errors, please post them.

>hello
>sorry,but it don't work and i guess that is from because i am newbies.
>when i select Form1.cs it appear a ressource but i don't see when i can put my code,and when i click on the form it send me to a code and when i put the code it don't work.
>please,can u explain me with detail how to add the code and when i find Form1.cs .
>thank u,and sorry for any distruption

--
there must be a "form1.cs" in your solution explorer (right sided). just right-click and select "view code"
now you see the whole code of this form (actually the whole code of the entire project/solution)
delete that code completely.
and paste your code instead.
now "form1.cs" is just your code.
thats it.
start the whole thing. it should work.

good luck.
andi

Hi
I´m trying to install Roman Kiss-WSE-DIME-project at
http://www.codeproject.com/cs/webservices/remotingdime.asp
But I keep on getting the error

"Remoting configuration failed with the exception System.IO.FileLoadException: The located assembly's manifest definition with name 'WSDimeChannel' does not match the assembly reference."

when I testdrive the WindowsClient.

I have done everything that the instruction says. Including draging the 3 dll to the %windows%/assembly - folder.

Running the WebService and trying the echo-method works fine. I may have some errors in the machine.config-file. Can this be of importance (several names with the same ID") Is there something I have forgot when I install the project?

What can be wrong?

Regards

Daniel

is it possible to wrap text in a cell of a datagrid?

if so .. is it possible to make the row height change depending on how much text is in that cell?

put a textbox inside.

the rowheight property changes all the rows

I'm not an expert yet, but I play one at work. Yeah and here too.

I'm finishing up development of a network file backup
application consisting of a C# Windows form app and a
windows service.

Both the form app and the windows service exist in
seperate solutions, and each one is built with its own
installer. Works fine.

I'd like to be able to deploy both components together in
a single installer, but I'm not sure about the best way
to go about it...

I was thinking about adding an installer project for the
service to the form project, or possibly combining the two
solutions somehow, but I'm really just shooting in the dark
at this point... I'm probably making this a lot harder than
it really is..

Would appreciate any suggestions or resources for
packaging both solutions into one installer...

thanks,

vince
..

.

Hi,

Can anyone tell me if a [VB.NET to C#] source code converter utility available on the internet.

clr.

Check out the following CP article:

GBVB - Converting VB.NET code to C#

..:: Keno ::..

How would I implement a checkbox in a datagrid column that when checked or unchecked changes the value for that column in that row??? Confused | :confused:

you can use events, use a checkbox control inside the column and respond to its event

Like, hey scoob they got everything for a DataGrid!

I'm not an expert yet, but I play one at work. Yeah and here too.

QUESTION 1: Does anyone know how to work with this class? I need some code snippet on how to work with ClientSponsor.

QUESTION 2:
I also tried this on server side (console app hosting the remote object):

using System.Runtime.Remoting.LifetimeServices;

LifetimeServices.LeaseTime = TimeSpan.FromMinutes(3);
LifetimeServices.RenewOnCallTime = TimeSpan.FromMinutes(3);

But an RemotingException was thrown on server side, complaining that "LeaseTime can only be set once within an app domain".

QUESTION 3: extracted from MSDN:
context: <lifetime> element in config file.
Quote: "Contains information about the lifetime of all client-activated objects serviced by this application."

I thought "lifetime" applies to:
a. server-activated Singleton
b. client-activated

But according to MSDN, it seems that it only applies to "client activated" remote objects.

QUESTION 4: Can I modify config files at runtime? Do I need to restart server for modifications on config files to take effect?

Thanks!

Hi, I have a listBox. I am trying to bind it to a dataSet that has multiple tables and data relations. Below is the code I am trying to use. The problem is invName is in a table called products and invID is in a table called inventory. I have no idea how to get this to work, as I have never done this before. The two tables are joined together by a key called invProductID (thats the master key in products)

eoListBox1.DataSource = generalDataSet;
eoListBox1.DisplayMember = "invName";
eoListBox1.ValueMember = "invID";

Are you looking for the SQL code to get the data, or trying to get the list box to work? I notice you are missing the DataBind() call...

toticow wrote:
eoListBox1.DataSource = generalDataSet;
eoListBox1.DisplayMember = "invName";
eoListBox1.ValueMember = "invID";
eoListBox1.DataBind();

hi !

i have a datatable and a datagrid bound to that table.

now i want to have a new datagrid which should display the same data as the old_datagrid, BUT: only two columns not all of them.
(
in addition to that, when i select a row of the new_datagrid the row-specific-data of the remaining three columns should be displayed in three labels.
)

i thought the dataview could help, but it looks like, it only filters out rows, not columns.

any ideas ?!

THANKS A LOT !!!!!!

Create yout own tables styles collection and give it the same name as the dataset

Like dude, its everything about a data grid

I'm not an expert yet, but I play one at work. Yeah and here too.

Thanks for that great link !!!!

andi

Hi im trying to use this line of code to create an xml file but it just overwrites it every time or appends to the wrong part. I have tried changing the bool to true and false also tried changing write to writeline nothing works please help.

using (StreamWriter sw = new StreamWriter("TestFile.xml"))
{
sw.Write("<DispatcherQ>" + "<Dispatcher> " + DispID.Text + "</Dispatcher>" + "<CustomerInfo> " + listBox2.SelectedItem.ToString() + "</CustomerInfo>" + "<TaxiInfo> " +listBox3.SelectedItem.ToString()+ "</TaxiInfo>" + "</DispatcherQ>" );

}

Thanks alot,
Big Grin | :-D

Da Intern