Hi all, I am wanting to create a re-useable class to manage db connections in an app. This is what i have so far: using System; using System.Data; using System.Data.SqlClient; using System.Configuration; public class DBUtil { public DBUtil() { } public s...more >>

This seems like it has probably been covered many times before, but I'm having a hard time finding any discussion about it (probably just searching the wrong terms). Is there a way to capture whether the Text of a TextBox has been changed by code or the user. I don't care if the Text is chang...more >>

Hi there, In the expression A + B where A is a string and B isn't, I know that "B.ToString()" will be called and the results concatenated. If B is null however does the standard guarantee that "String.Empty" will be used instead. Thanks. ...more >>

I traced this all the to the domain boundary. I also but a breakpoint in the server. That was never hit. It happens after it leaves the client but before it calls into the "add" method in the server. I don't know how to debug this any further. exact error message and code follows thi...more >>

I cannot stand being unable to change the code while the debugger is running. Is there a way to do this? thanks, Zytan ...more >>

Hi, I'm developing a C# app that monitors the data feed for a single stock. I want to start multiple instances of app dynamically passing the stock symbols to instances as they start up. Any ideas on how I can do this? Thanks in advance, EG *** Sent via Developersdex http://www.devel...more >>

Hello, A timer control (I think) runs in another thread apart from a main form. In the OnTick event, you can update some form control with no worries. I'm making an AsyncronousServer class that runs in a separate thread and I'd like to have server generated events (OnListen, OnConnect, O...more >>

Hi I have a problem in the form designer , when i SINGLE click a control in the forms designer the IDE sometimes generates code for the default event. I recently updated to sp1 and i think this is the reason Any suggestions ? ...more >>

I have a scenario where a user can click on a textbox, a context menu is displayed and he can select a particular text from the list. Then, that text will be appended to the textbox. Thus i have several textboxes, that share the same context menu since the text is common, and all the items ...more >>

I'm using the .Net 2.0 SoundPlayer class for the sound effects in my = app. But it doesn't seem to allow simultaneous sounds... I'm even = executing the instantiation and play on a separate thread. But sound = two never gets played. Anyone have much experience with this? Thanks. J...more >>

Hi, I have method that should according an input argument (a collection) call the appropriate callback delegate. I am using a list, where I store a struct with fields: delegate, input argument. To invoke a proper delegate I have to go through this dictionary, compare input argument an...more >>

I have scenario where I need to create an object of an unknown type. Reference types work fine. I call Type.GetConstructors(), let the user pick a ConstructorInfo and then call ConstructorInfo.Invoke(). However, for the value types I have tested (like Int32) GetConstructors doesn't return any...more >>

I have a db with two tables, Parent and Child. A Parent will always have 1 or 2 children: Child1, Child2, or both children. I'm writing a C# windows app over these tables. The user, in a datagridview, will be able to view, update, etc. the data. Problem is, I have to flatten the two tables int...more >>

I posted a month or so ago and never got a response. So I'm trying again. I just moved over to C#2. In 1.1 I implemented a generic event handler strategy by emitting a handler of the correct signature type. However, with Covariance/Contravariance in C#2 I hoped to clean things up. Since...more >>

I am using Dns.GetHostByAddress and Dns.Resolve to successfully resolve and IP address to an IPEndPoint. IPEndPoint ep = null; IPAddress ipAddr = IPAddress.Parse(m_sRemoteHost); ep = new IPEndPoint(Dns.GetHostByAddress(ipAddr).AddressList[0], m_iRemotePort); // ep = n...more >>

Say i have: [Serializable] public class A { } public class B : A { } does B need the serializable attribute as well? dan...more >>

Hi, I am working on some general OOP constructs and I was wondering if I could get some guidance. I have an instance where I have a Base Abstract Class, and 4 Derived classes. I now need to make a list class that will store the objects. My question is how do I go about creating the lis...more >>

Hi All I have a custom class that is derived from the PictureBox class. One of the properties from the PictureBox class is "SizeMode" and in my custom class I want to disable the user from being able to modify this. How can I remove this property from my class? Thanks, Steve ...more >>

Is it possible to reference .lib files in a C# project? Or is there process that can make a .lib file accessible from a C# project? Cheers! ...more >>

Hello All, I'm validating a textbox to make sure it contains only a whole number so I'm using Int32.TryParse. It works fine when I test it on a local winform app. However, when I transfer the code to my project that's using ClickOnce, it throws an error. Here's the code that's identical in ...more >>

I am converting a VB.NET application to C#.NET and I have ran into a situation that I cannot so far find an answer to. Retrieving data with an ODBCDataReader, I could issue a rdr.Read method call and then refernce the columns with the rdr("columnname") function. Seems that C# does not allow acce...more >>

Fairly new to ACLs and I'm not understanding a behavior. I am moving a folder, modifying its ACL, and then eventually moving it back to its original location. And I can't seem to get the ACL back to the original. Original: Root folder has explicit full rights ACE for a user account. All s...more >>

Hello, I am using Visual Studion.net 2003 to run and test a small program that supposed to be tested in a word document. I got the connection and using a data reader to read the data. It executes fine but I don't see the results in command prompt beacuase I use VS.net 2003 to run the program...more >>

Hello, I am using Visual Studion.net 2003 to run and test a small program that supposed to be tested in a word document. I got the connection and using a data reader to read the data. It executes fine but I don't see the results in command prompt beacuase I use VS.net 2003 to run the program...more >>

Hi Everyone, I've been tasked with building a messaging service for a custom app that supports localization. Within the app itself people will be able to specify the languge of their choice and therefore can switch at run time. However, the UI layer will send the locale of choice to my c...more >>

I am trying to use a custom type inside settings.settings. When I create my class, I am able to add it in as the type and the value ends up showing as XML data. If I change any of the values in my class, the values do not update the settings file. Can anyone provide any insight and/or sampl...more >>

Hello, I was trying to do a WCF tutorial (http://wcf.netfx3.com/content/ BuildingHelloWorld.aspx). I need to get the meta data from my service usin svcutil.exe why is not working? Please see below: E:\Program Files\Microsoft SDKs\Windows\v6.0\Bin>svcutil http://localhost/hello?wsdl Micr...more >>

Hi I have a Form with textbox controls on it and a run button The Run button Starts a Class that does some work against our Sql Database In a Loop During this time i want to update the windows form for current status of this Object running Iam havein problems referencing back to the form i...more >>

I have an event handler on the CellFormatting event of a DataGridView. This event handler highlights cells that are below a certain threshold. This threshold value may change based on user actions. Once changed, any new cells that scroll into view will use the new threshold value, but how coul...more >>

I have a simple need. scan bills into the computer, ocr them, use c# to build some simple screen that would allow copy/paste from the ocr into author, and a few keywords. this would be updated into the file on the hard drive (in the summary tab on the file>properties) why am i not findi...more >>

Hello, I have another method in a DLL which i am trying to use and i keep getting null reference exception can anyone shed any light on this. int GetConnectedControllers(char * controllers , int controllersSize) which should return buffer of chars which indicates readers connected. which ...more >>

In the Data explorer, how can I add another .net data provider?. I know the path and the dlls? I already tried adding the reference in the project solution ...more >>

Hi, I developed an application that generates code to be dinamically execute with reflection. When I used reflection everything seems to work fine until I saw a handle and memory leak. Researching in the web I found several news that explaine memory leaks and handle leaks with reflection. N...more >>

I have 2 constructors in my class, first one with no paramter and the second one is with a paramter. I want the later constructor to use the first constructor and do some more with the parameter. How can I do this? eg: public const() { //do base work } public const(string data) { ...more >>

I have a database table that contains approx 150 columns per row. I need to update all 150 columns at once. To create a stored procedure will cause me to have to create 150 sqlParameters....Rows will only be updated one at a time. Does anyone else have any thoughts on the best way to handle t...more >>

I have the following line of code (.NET 2.0): myDataView.RowFilter = "SELECT DISTINCT CYCLE_DATE"; where CYCLE_DATE is one of my column names. This throws the following exception: Syntax error: Missing operand after 'DISTINCT' operator. Any suggestions on what this is really trying to ...more >>

Hello, I have started to use an old WIN32 API to develop an application and am having trouble executing one of the DLL's methods. int ContactController(char *ipHostName, int port) I have my code as follows: [DllImport("MYDLL.dll", SetLastError = true, CharSet = CharSet.Auto)] stat...more >>

using System; using System.Drawing; using System.ComponentModel; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Text; using System.Collections; using System.Diagnostics; public delegate bool IECallBack(int hwnd, int lParam); public delegate bool IEChildCall...more >>

Hi, I'm presented with the task of making a quick mockup of an entire ecommerce site (with user administration, shopping basket and whatnot). I've previously been involved in developing a number of sites of the same size, and have gotten used to a certain way of doing things, ie. a number ...more >>

I'm trying to create a context menu that pops up upon right clicking the notify icon of my application. The menu works great with plain text... no problem. My problem is that I want to add some sparkle by displaying a different highlighting scheme for the individual mouse over events and ...more >>

hi, how to drag and drop element from datagridview to treeview? \ Thks.... ...more >>

Thanks Shiva you helped me to solve that problem.But i have one more problem Now I am able to create the web service successfully, I have a doubt after creating the web service, need we to debug it? After creating the web service I created the C# windows application, and Added my the web servi...more >>

I am refactoring some code to move some base classes into a separate assembly. One of these base classes has a member property which is 'protected internal'. However when I move these base classes to another assembly, the compiler complains that the override in the derived class, also declar...more >>

Hi We have a ASP.net app which calls into a web service which allow users to print stuff. At the moment they have to specify the printer. Apparently this is too much for our users, so I was wondering if there's a way of getting the default printer from their user profile? TIA Glenn...more >>

Hello! I have to sign my assembly (WinForms C# 1.1) with a string name. Unfortulately, I'm forced to reference another assembly (no COMInterop Wrapper) not being signed with a strong name. This results in an compiler error preventing my assembly from being build. I cannot influence anything o...more >>

Hi, Is it possible to change a threading timers delay and interval from another threading timers callback routine? Thanks Ole ...more >>

Hi, I got a service (written in C#) that sends out messages to a third party system. The messages contain encoded attachments. Everything works fine as long as the messages are small (say < 100kb). When I try to send message >100kb I get an expception stating: "The underlying connection w...more >>

I have an application using dial monitors which is used in an aution room. The auctioneer has a form showing details of the current lot number. As he changes to the next lot number I need to send a message to a form on the other monitor to change to picture to this new lot. Shat is the be...more >>