Select a perticular value in combo box - C# Discussion Boards

Re: How is the algorithm to compare a "lot" of strings, tell z frequency and tell which similar strings are found in which index?

Alan Balkany21-Dec-09 9:55

Alan Balkany

21-Dec-09 9:55

Using a NameValueCollection will do the sorting for you. If the string isn't in the collection, insert it with a count of 1. If it IS there, increment the count.

The collection will instantly tell you how many different strings there are with the Count member.

C# for beginners

APolancoS21-Dec-09 5:31

APolancoS

21-Dec-09 5:31

Hi everybody
I'm new using programming languages. I took a basic course of C++ in college. But most of my friends told me C# is more used than C++. I could prove it checking some nice projects made for CS master students.

I wanna learn everything, specially windows app. Please, give me some advices to start up. I've found some manuals and tutorials but they are so advanced for me. please put me in the right track.

Thanks!!!

Re: C# for beginners

EliottA21-Dec-09 5:33

EliottA

21-Dec-09 5:33

Any book that has beginners and C# in the title is designed for you. If you understood the core concepts of C++, then C# shouldn't be all too difficult for you. Most people would fine C++ to be entirely more complicated then C#, so you have a slight advantage over them. Go to a bookstore, or library, pick up a beginners book and work through it.

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Re: C# for beginners

APolancoS21-Dec-09 16:15

APolancoS

21-Dec-09 16:15

Thanks

Re: C# for beginners

Richard MacCutchan21-Dec-09 6:06

Richard MacCutchan

21-Dec-09 6:06

Charles Petzold's .Net Book Zero[^] is a great place to start with C#, and gives enough grounding for you to get familiar with the basics of the language and the .NET concepts.

Re: C# for beginners

V.21-Dec-09 20:38

21-Dec-09 20:38

In addition of your book in case you get stuck:

- MSDN[^]
- CP[^]
- Google is your friend[^]

good luck !

V.

Stop smoking so you can: Enjoy longer the money you save.
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Re: C# for beginners

Rob Philpott21-Dec-09 21:57

Rob Philpott

21-Dec-09 21:57

I'd take a look at CLR via C# by Jeffrey Richter. This is a brilliant book, albeit not that simple in places, but if focuses not just on C# but on .NET itself.

C# is meaningless without the context of .NET so you need to know both.

Regards,
Rob Philpott.

Select a perticular value in combo box

NarVish21-Dec-09 5:05

NarVish

21-Dec-09 5:05

Hi,
I've a combo box, which contains Sites' names(data comes from database). One of the item is "Create new site". I would like to keep the "Create new site" item at the top of all items. I tried to accomplish this by setting SelectedValue to 0, But it didn't work. Below is my code. Please guide to solve this issue. Thanks in advance.

DataTable dtSite = new DataTable();
DataRow drNewAction;

dtSite = objSites.SelectSites();
drNewAction = dtSite.NewRow();
drNewAction["SiteKey"] = 0;
drNewAction["SiteName"] = "Create new site";
dtSite.Rows.Add(drNewAction);

comSiteList.DataSource = dtSite;
comSiteList.DisplayMember = "SiteName";
comSiteList.ValueMember = "SiteKey";
comSiteList.Tag = "Loaded";
comSiteList.SelectedValue = 0;

Re: Select a perticular value in combo box

dbrenth21-Dec-09 7:51

dbrenth

21-Dec-09 7:51

Not sure I understand what you mean by "top of all items". But ComboBoxes will display the list in the exact order they are added to the list - unless you set the sorted property. Even if you have a sorted property you can trick the combo box by starting the item text out with a character that has an ascii value less than 65, like a space or a perenthesis. This will keep the item you want at the top of the list.

Brent

How can i make shortcut keys by using code

inayat basha21-Dec-09 4:49

inayat basha

21-Dec-09 4:49

how can i make shortcut keys in code for examole if i press F1 then some page has to redirect or open. can any one help me plzzz

Regards,
S.Inayat Basha.

Re: How can i make shortcut keys by using code [modified]

robbrad21-Dec-09 5:14

robbrad

21-Dec-09 5:14

http://www.devasp.net/net/articles/display/728.html[^]

Edit: This shows you how to map keys to certain buttons (Not tested).

modified on Monday, December 21, 2009 11:21 AM

Re: How can i make shortcut keys by using code

Luc Pattyn21-Dec-09 5:32

Luc Pattyn

21-Dec-09 5:32

Hi,

there are two ways:

1.
the easy one: give your Form a MainMenu or MenuStrip and make sure the actions you want are present in the menus; all it takes to create shortcuts is setting their corresponding ShortCut property.

2.
the harder way (also for the user as he has no clue what shortcuts are available): let your Form preview the keyboard (Form.KeyPreview) and give it a KeyDown handler. No need to process the keys for each individual Control on the form!

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Update web.config at run time [modified]

treuveni21-Dec-09 4:13

treuveni

21-Dec-09 4:13

Hi,

I'm trying to update my webconfig at runtime throught the .cs file.
This us the code i want to edit:

<br />
<identity impersonate="true" userName="SomeUser"<br />
      password="Password"/><br />

I want to chage the value off "SomeUser" and "Password" to veriables such as,
txtserName.text and txtPassword.text.

Can i do it?

Please help... Frown | :(

modified on Monday, December 21, 2009 10:21 AM

Re: Update web.config at run time

treuveni21-Dec-09 20:51

treuveni

21-Dec-09 20:51

Can someone please help me with this?

Text Cahnging Whith BarCode Reader in TextBox C#

Thaer Hamael21-Dec-09 2:09

Thaer Hamael

21-Dec-09 2:09

Hi All

How do I know if the text(string) is written in the in TextBox in C# Windows Application
Is From Barcode Reader or From user of the system .

thanks Rose | [Rose]

Thaer

Re: Text Cahnging Whith BarCode Reader in TextBox C#

Md. Marufuzzaman21-Dec-09 3:06

Md. Marufuzzaman

21-Dec-09 3:06

Could you clarify your question with some more detail...

Thanks
Md. Marufuzzaman

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

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Re: Text Cahnging Whith BarCode Reader in TextBox C#

Keith Barrow21-Dec-09 3:09

Keith Barrow

21-Dec-09 3:09

Depending upon the code base you have, you probably can't directly, as once the the barcode is in the text box, it is just a string.

You have a couple of options, depending upon why you care that the reader is the source.

1. Record the fact the barcode has been read by a reader when the reading has been done (Reliable)
2. Check that the textbox text is in the form of a barcode number, assuming you have one. This isn't reliable, as the user could enter the number directly or it could come from another source.

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Re: Text Cahnging Whith BarCode Reader in TextBox C#

DJ Matthews21-Dec-09 3:40

DJ Matthews

21-Dec-09 3:40

Some barcode scanners have the ability to add a delimiter character to the start or end of the string the read will return.

You can then check for this delimiter character to see if it came from your reader.

Socket Error: A non-blocking socket operation could not be completed immediately

Harvey Saayman21-Dec-09 1:52

Harvey Saayman

21-Dec-09 1:52

Hey guys

As you may or may not know I've been busy working on a scalable asynchronous TCP server... After previous suggestions here in the forums I've succeeded more or less Smile | :)

My only problem right now is that sometimes, usually when I try to send a packet to a 2nd or 3rd client (my server is just echoing at the moment) I get an exception:
A non-blocking socket operation could not be completed immediately D'Oh! | :doh:

Googling around it seems that this is a non fatal exception and quite normal for asynchronous TCP communications...

My question is how should I handle this?

Thanks

Harvey Saayman - South Africa
Software Developer
.Net, C#, SQL
you.suck = (you.Occupation == jobTitles.Programmer && you.Passion != Programming)
1000100 1101111 1100101 1110011 100000 1110100 1101000 1101001 1110011 100000 1101101 1100101 1100001 1101110 100000 1101001 1101101 100000 1100001 100000 1100111 1100101 1100101 1101011 111111

How to get Modified Registry value old information

Member 437062521-Dec-09 1:18

Member 4370625

21-Dec-09 1:18

Hi,
i want to get the modified registry old information like version, if deleted then i want to know the deleted registry key display name. pls help me out..

vinoth kumar

Re: How to get Modified Registry value old information

Dave Kreskowiak21-Dec-09 3:34

Dave Kreskowiak

21-Dec-09 3:34

Can't be done. The Registry has no versioning or history support. There is no practical way to do what you want.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: How to get Modified Registry value old information

Member 437062521-Dec-09 6:52

Member 4370625

21-Dec-09 6:52

Actually i want after the installation/ uninstallation completion i want to get the product name and version information is this possible, or is there any other way available?.. pls help me out.

vinoth kumar

Re: How to get Modified Registry value old information

Dave Kreskowiak21-Dec-09 8:08

Dave Kreskowiak

21-Dec-09 8:08

So you're looking for the changes that the installation and then uninstall of an application makes to the registry??

You'd need to take a snapshot of the registry, building a database of all the keys and values you're tracking (not everything in the registry would be needed), do the install/uninstall, then take another snapshot, build a second database, then compare the two databases for the changes.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

list of structs

benams20-Dec-09 23:18

benams

20-Dec-09 23:18

AirplanePilot is a struct with some properties, I have the following:
List<airplanepilot> lst;

when I try to change a property(of int type) of one of the list members I get an error:
"cannot modify the return value of because it is not a variable".

I have to mention that when I simply change a property of a struct which is not a member of the list it goes well and I get no errors

Re: list of structs

Keith Barrow20-Dec-09 23:50

Keith Barrow

20-Dec-09 23:50

The problem is because you are using a struct, you are modifying a copy of the object you think you are updating. This is because structs are value types rather than reference types, in C# structs are rarely needed. What you have experienced is a common problem that c++ developers hit when making the switch.
The simplest solution is to make AirplanePilot a class as opposed to a struct. It is probably more efficient as well.

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