C# Discussion Boards - CodeProject

21-Mar-09 9:42

Hello,

How we can Convert String to set it on richBox, i try for MailMessage2.Text = "eeeeeeee"; but there are an exception : Object reference not set to an instance of an object, thank you verry mutch.

DaveyM6921-Mar-09 10:06

21-Mar-09 10:06

Have you actually created an instance of MailMessage2?

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

abbd21-Mar-09 10:08

21-Mar-09 10:08

no, how i van make this?? thank you verry mutch.

DaveyM6921-Mar-09 10:16

21-Mar-09 10:16

This is very basic stuff - you really should work through some online getting started articles/blogs and buy a book or ten.

Assuming MailMessage2 is your RichTextBox:
RichTextBox MailMessage2 = new RichTextBox();

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

c0ax_lx21-Mar-09 11:48

c0ax_lx

21-Mar-09 11:48

Does your code look like this:
public Form1()
{
MailMessage2.Text = "eeeeeeee";
InitializeComponent();
}?

change it to

public Form1()
{
InitializeComponent();
MailMessage2.Text = "eeeeeeee";

}

If it' stuck, DO NOT pull harder!

An object reference is required for the non-static field, method, or property

fly90421-Mar-09 12:44

fly904

21-Mar-09 12:44

abbd wrote:
thank you verry mutch.

"Thank you very much."

I've noticed it on all you're posts.

hmmm pie

Cryptography

kenexcelon21-Mar-09 9:37

kenexcelon

21-Mar-09 9:37

I'm just starting to look at creating a Rijndael encryption library to encrypt strings and files (input and output file name). However, since this is just for my personal use the key is stored right in the library. I'm trying to look into a way to be able to use this library but store the encryption key securely to use for encryption, and decryption. Or would asymmetric encryption be better? What articles would you recommend to look at for either case for key, and possibly init vector storage either on CodeProject or elsewhere?

I've been trying to find some simple articles that are very good, but maybe I'm not using the correct search terms.

Thanks

Revolutionary: Disk drives go round and round.

Re: Cryptography

Ravadre21-Mar-09 16:33

Ravadre

21-Mar-09 16:33

1. Rijndael algorithm is already implemented in C# Stdlib.
2. The whole purpose of having key is to NOT writing it down. For example you can generate it from password. Lets say you have a password "foobar". To encrypt data you get hashcode from you password and you use it as key, then to decrypt the data, you will just get hash from password again. So, what's the point of keeping key?

Re: Cryptography

kenexcelon22-Mar-09 5:59

kenexcelon

22-Mar-09 5:59

Right, I was just starting to research this topic. I'm new to this so I was trying to get it to work any way I could at first and then as I learn more, the library would become more mature and secure. I will look into generated a key from a password. It seems there is an object type called PasswordDerivedBytes as I searched a little last night. I am looking for a way to keep the key secure as I know it's not good to store it. So now when I use this with a website or program, the password will simply need to be passed in to generate the key in the code for encrypting decrypting if I am understanding this correctly. Thanks for that suggestion, I will attempt to put it to use.

Hope you had a great weekend.

Revolutionary: Disk drives go round and round.

abbd21-Mar-09 9:16

Re: An object reference is required for the non-static field, method, or property

21-Mar-09 9:16

Hello, i try for this :

<br />
 System.Windows.Forms.TextBox To;<br />
 mail_message.To = To.Text;<br />
<br />

But i have this error :An object reference is required for the non-static field, method, or property , can uou help me? thank you verry mutch.

DaveyM6921-Mar-09 9:20

The name 'Invoke' does not exist in the current context

21-Mar-09 9:20

System.Windows.Forms.TextBox To = new System.Windows.Forms.TextBox();

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

abbd21-Mar-09 9:14

Re: The name 'Invoke' does not exist in the current context

21-Mar-09 9:14

Hello i have this error : Error 6 The name 'Invoke' does not exist in the current context i do this :

<br />
 if (statusStrip.InvokeRequired)<br />
            {<br />
                ConnectEventHandler con = new ConnectEventHandler(smtp_ConnectionEstablished);<br />
                Invoke(con, new object[] { sender, Server, Port });<br />
            }<br />

Help me please, thank you verry mutch.

DaveyM6921-Mar-09 9:22

21-Mar-09 9:22

You are trying to call Invoke on the class that this code is in.
It appears you might mean statusStrip.Invoke(...

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

kbrp

lakshmanriz21-Mar-09 9:07

lakshmanriz

21-Mar-09 9:07

HOW TO SEND A MESSAGE BY CHANGING THEIR VALUES ACCORDING TO THE PERMUTATION values.

dan!sh 21-Mar-09 9:33

dan!sh

21-Mar-09 9:33

Great subject. What does that mean?

Same goes with the post. Be descriptive and adhere to the rules.

जय हिंद

CPallini21-Mar-09 11:14

CPallini

21-Mar-09 11:14

Are you aware that your sentence doesn't make sense?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Nagy Vilmos21-Mar-09 21:51

Nagy Vilmos

21-Mar-09 21:51

CPallini wrote:
Are you aware ~~that your sentence doesn't make sense~~?

fixed it.

Panic, Chaos, Destruction.
My work here is done.

how link c# with prolog by DLL files

CPallini21-Mar-09 23:46

CPallini

21-Mar-09 23:46

Thank you. Big Grin | :-D

taha_geroun21-Mar-09 8:05

taha_geroun

21-Mar-09 8:05

can you help me please
i'm make project expert system in network computer designing and planning by c# language but I'm need implement some operations in prolog language so, I'm linked c# with prolog by File DLL his name(amzinet.dll) its good but when I'm execute the project in development phase with prolog , its show to me this message.
DLL (C:\Documents and Settings\jameil\My Documents\Visual Studio 2005\Projects\pets\bin\Debug\amzinet.dll) is attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang.
Managed debugging assistants (MDAs)

but the project's file executive
in directory bin his executed correctly.

please help to me

i'm sorry my english language's is very bad

Re: how link c# with prolog by DLL files

Henry Minute21-Mar-09 9:26

Henry Minute

21-Mar-09 9:26

You might get a better response from the Amzi Support Forums here[^].

I would try there, if I were you. Come back here if you get no joy there.

Dclare a public ArrayList

abbd21-Mar-09 7:29