Re: Counting the new items in the database - C# Discussion Boards

Re: Show me an elegant way to group objects

Mark Churchill20-Dec-07 19:38

20-Dec-07 19:38

Ok, so the part thats only knowing about Foos - what operations is it going to perform on the grouped Foos? Is this a seperate clump of data that will be passed out, or is it fine if the other section queries the existing structure?

Does it have to be serializable?

null keys make an elegant structure a pain - you could inherit Dictionary and keep a seperate list of unparented Foos... basically adding null keys to a dictionary. Bit of work though.

You could also attempt to provide a singleton "null" Foo - similar to DBNull.Value and use that exclusively for keying a Dictionary< Foo, List< Foo>> structure.

Elegance really is going to depend on what the consuming code wants to do with these Foos. :P

Mark Churchill
Director
Dunn & Churchill
Diamond Binding: Zero to Data Layer in 3 mins

SaveFileDialog on Vista not creating files???!!

LongRange.Shooter20-Dec-07 9:58

LongRange.Shooter

20-Dec-07 9:58

I have an application that needs to save some translated files.
So I did what any developer would and incorporated a SaveFileDialog into the project.
It is configured for CreatePrompt = true.

When I run the application and give it a filename inside a folder (that I have the rights to write files to) I click save and get a dialog box that basically says:
Hey, that file doesn't exist!

Then I only get a button to say Okay .. but no button to Create.

Has anyone else experienced this? I see examples EVERYWHERE that I should totally be able to provide a new file name and expect to get it created without the Dialog box from actually blocking me from creating a file!

Thanks,

Michael

Re: SaveFileDialog on Vista not creating files???!!

Paul Conrad24-Dec-07 19:37

Paul Conrad

24-Dec-07 19:37

theRealCondor wrote:
Has anyone else experienced this?

Nope.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

SNTP Request Object

Skippums20-Dec-07 8:59

Skippums

20-Dec-07 8:59

I am attempting to synchronize my system clock with an NTP server using SNTP. I have found a number of publicly available NTP servers hosted by NIST and affiliates here[^]. I also found a reference to the type of message I will receive from the server here[^]. However, I don't know how to get this response from the server. Does anyone have experience with something like this that he or she will share with me? Thanks,

Sounds like somebody's got a case of the Mondays

-Jeff

Re: SNTP Request Object

Skippums21-Dec-07 5:02

Skippums

21-Dec-07 5:02

I found the answer... you send a byte array with 48 empty bytes as a udp client, then listen with the same client for a response. The code is as follows, where m_ep is the IpEndpoint of a NTP server (port 123):

private static readonly IPEndPoint MY_IPEP = new IPEndPoint(IPAddress.Any, 0);

private void GetTime(object clientObj) {
    UdpClient client = (UdpClient)clientObj;
    byte[] result = client.Receive(ref m_ep);
    ... // Do whatever you want with result
}

private void button1_Click(object sender, EventArgs e) {
    UdpClient client = new UdpClient();
    client.Client.Bind(MY_IPEP);
    new Thread(new ParameterizedThreadStart(GetTime)).Start(client);
    byte[] message = new byte[48];
    message[0] = 0x1B; // Indicates version 3 and client type
    client.Send(message, 48, m_ep);
}

Hope this helps someone.

Sounds like somebody's got a case of the Mondays

-Jeff

Counting the new items in the database

s3rro20-Dec-07 7:56

s3rro

20-Dec-07 7:56

I have an access db. Tables have a YES/NO check box as the "NEW ITEM" column, I want to count how many new items are in the db. and print it.

I am connected to the db, how can i count ?

DataAccess da = new DataAccess();

//Choose the table
string sql = "SELECT * FROM read WHERE New?=true ";

and wanna print it as:

You have" + " " + i.ToString()+ " " + "clients waiting";

thanks

Re: Counting the new items in the database

Not Active20-Dec-07 8:47

Not Active

20-Dec-07 8:47

To get a count using SQL you would do this

SELECT COUNT(*) FROM read WHERE New?=true

This will return a single scalar value

only two letters away from being an asset

Re: Counting the new items in the database

s3rro20-Dec-07 9:15

s3rro

20-Dec-07 9:15

thanks, worked well

Capturing the Print Event in C#

VivyG20-Dec-07 5:52

VivyG

20-Dec-07 5:52

Hi,
I hope someone can help me here. We have a 3rd party windows application that is written in .NET 2 and want to prohibit users from being able to use on of the features which seems like a simple print screen from a right click on a list of contacts. The problem is I am a fairly novice C# coder but it has become my problem!

I guess that I would need to somehow capture a win32 API onPrint() event but the problem is I have absoloutly no idea about how one would go abouts doing this. I think it would be a very important step in my learning if I could understand how I could create a custom event handle to a win32 API call. Confused | :confused:

Does anyone have any ideas on how I could do this or where I could find articles on this? I read one article but it went quite over the top of my head and did not seem to work on XP sp2 or vista machines.

Cheers,

Viv

Re: Capturing the Print Event in C#

Not Active20-Dec-07 6:29

Not Active

20-Dec-07 6:29

You want to prevent printing from a third party app? Unless you have the code for this app and modify it, the only other way is to somehow hook into the app, which isn't easy even for experienced people, let alone a novice.

only two letters away from being an asset

Best way to read XML

netJP12L20-Dec-07 5:41

netJP12L

20-Dec-07 5:41

I have different types of objects stored in a xml file. I am wondering what is the fastest/best way to read this file. I mean, should i go line by line or should i read as an object. If reading as an object reduces extract codes then can somebody provides me a simple example.

thanks for answering

Re: Best way to read XML

J$20-Dec-07 5:54

20-Dec-07 5:54

You can use the XmlDocument object to read elements in an XML file.

<br />
// Create XmlDocument object<br />
System.Xml.XmlDocument xmlDocument = new System.Xml.XmlDocument();<br />
<br />
// Read the XML from a file into the XML Document<br />
xmlDocument.Load(filePath);<br />
<br />
// Or if you have already read it into a string variable, you can load it like this<br />
// xmlDocument.LoadXml(xmlString);<br />

Re: Best way to read XML

J4amieC20-Dec-07 6:00

J4amieC

20-Dec-07 6:00

There is no "best" way, but there are at least 3 different ways depending on the circumstance.

1) Use XmlDocument as described above. This allows you read/write access to the Xml file and is therefore generally the slowest.

2) Use an XmlTextReader gives you forward-only read access.

3) use XmlSerializer to turn an object graph into an object. This could well be the "fastest" but it would depend entirely on your object.

Re: Best way to read XML

Ed.Poore20-Dec-07 12:28

Ed.Poore

20-Dec-07 12:28

XLINQ?

(XDocument)

My Blog[^]

Re: Best way to read XML

DaveyM6923-Dec-07 22:32

DaveyM69

23-Dec-07 22:32

If you have LINQ availale in your .net / vs version - use it! It takes a bit of getting used to, but so far I have found it to be far simpler than using XmlDocuments, readers, Xpath etc...

using System.Linq;
using System.Xml.Linq;

will change (for the better) the way you work with xml!

Datagridview update problem

NewToAspDotNet20-Dec-07 5:31

NewToAspDotNet

20-Dec-07 5:31

Hi guys,
I have a datagridview. i can delete all rows, bud not the last row, i mean i can't never delete wen there is only one row remaind.
any idea how to fix this?

thanx.

Re: Datagridview update problem

DotNetXenon20-Dec-07 6:17

DotNetXenon

20-Dec-07 6:17

Can you post your code?

------------------------------------------------------------
"The only true wisdom is in knowing you know nothing." --Socrates

Re: Datagridview update problem

NewToAspDotNet20-Dec-07 6:22

NewToAspDotNet

20-Dec-07 6:22

da_imp = new DataAdapter(sqlcommand);<br />
SqlCommandBuilder cb_imp = new SqlCommandBuilder(da_imp);<br />
da_imp.Update(dt_imp);

MS ACCESS / Web + Desktop Application

s3rro20-Dec-07 5:03

s3rro

20-Dec-07 5:03

I have a desktop application, where you have a link to start the web application. The web application uses a ms access db to retrieve data from.
Now what I want to add is, a "next" button on the desktop app, to get the next row on the ms access to be retrieved and printed to the web applications.

right now the web app get the data on page_Load

public void Page_Load(Object sender, EventArgs E)
{
DataAccess da = new DataAccess();

//Choose the table
string sql = " SELECT * FROM readfrm";

DataSet result = da.GetDataSet(sql);
int size = result.Tables[0].Rows.Count;
// string txtName.Text;

txtName.Text = result.Tables[0].Rows[0]["Name"].ToString();

How can I retrieve the next row on db readfrm by a next button on my desktop app ? The reason is desktop app is a small notification window which is trigerred by some event to tell you there are new rows added to the db, and by clicking on it or clicking on next you will see whats new on the db.

Thanks

Re: MS ACCESS / Web + Desktop Application

J$20-Dec-07 5:40

20-Dec-07 5:40

I'm not entirely sure how your desktop and web app are set up, but this is how I would do it.

Assuming that your Desktop app knows about the new record(s) that you want to display in the Web app (for example, it knows the ID of the new record), I would have the link that points to the Web app have a querystring value for the ID of the record to open in the Web app.

The URL in the link will looks something like http://mydomain.com/ShowMeTheNewRecord.aspx?id=New_ID_From_Desktop_App_Goes_Here

Obviously New_ID_From_Desktop_App_Goes_Here will be replaced with the identifier for that record in the database. Then you can check in your page load to see if there is a querystring value, and if there is, load the corresponding record in your webform.

Hope I didn't confuse you...

ActiveDirectory - getting a lit of users in a group

RugbyLeague20-Dec-07 5:01

RugbyLeague

20-Dec-07 5:01

How do I programmatically get a list of users in an ActiveDirectory group? A google search has shown up several ways of doing it, none of which I can get to work and none of which seem to agree with each other. Is there a definitive way to, say, get a list of users of a group called, for example, Sales?

Re: ActiveDirectory - getting a lit of users in a group

Giorgi Dalakishvili20-Dec-07 5:14

Giorgi Dalakishvili

20-Dec-07 5:14

Did you search codeproject? There is one article which explains how to do anything with active directory

#region signature
my articles
#endregion

Re: ActiveDirectory - getting a lit of users in a group

RugbyLeague20-Dec-07 5:26

RugbyLeague

20-Dec-07 5:26

I've tried several articles on here and about 50 which Google has shown up. It might be that I have spent so long on this the answer will just pass me by now. I just want a list of user names from a group to populate a listbox. Creating and editing a text file to hold the data is looking very attractive right now.

Re: ActiveDirectory - getting a lit of users in a group

RugbyLeague20-Dec-07 5:36

RugbyLeague

20-Dec-07 5:36

A bit of venting always works $Shucks | :-\$

http://www.codeproject.com/KB/system/QueryADwithDotNet.aspx[^]">

String data into byte array without hex conversion

worked on mine20-Dec-07 3:55

worked on mine

20-Dec-07 3:55

How do I get string data into a byte array, programmatically, without doing a hex conversion. i.e.,
byte[i] = (???)string.Substring(0,2);

I need the programmatic equivelent of:
byte[] bytes = {0x14, 0x55, 0x90, 0x00, 0x01}; or
byte[i] = {0x + string}
I can't make any of this work. Need Guru!

TIA,
Steve

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