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  • C# myths about best practices?

    - by TheMachineCharmer
    My colleague keeps telling me of the things listed in comments. I am confused. Can somebody please demystify these things for me? class Bar { private int _a; public int A { get { return _a; } set { _a = value; } } private Foo _objfoo; public Foo OFoo { get { return _objfoo; } set { _objfoo = value; } } public Bar(int a, Foo foo) { // this is a bad idea A = a; OFoo = foo; } // MYTHS private void Method() { this.A //1 - this._a //2 - use this when inside the class e.g. if(this._a == 2) A //3 - use this outside the class e.g. barObj.A _a //4 - // Not using this.xxx creates threading issues. } } class Foo { // implementation }

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  • Synclock a section of code while waiting for ShowDialog to return

    - by clawson
    I'm having trouble working out how to lock my application out of a section of code while it waits for a response from an external program. I've used Synclock on a section of code with the Me object in the expression. In this Synclock I call an overridden ShowDialog method of a dialog box, which has a timeout parameter, but does return the value from the underlying ShowDialog function call ,once the timer is setup. Works like this. SyncLock Me Dim frmDlgWithTimeout As New frmDlgWithTimeout ' dialog box with overridden ShowDialog ' Dim res As DialogResult = frmDlgWithTimeout.ShowDialog(10 * 1000) ' 10 sec timeout ' End SyncLock Now, external programs may raise events that bring my application to this Synclock but it doesn't prevent it from entering it, even though the ShowDialog function hasn't returned a value (and hence what I thought would keep the section of code locked). There is only one instance of the object that is used for lock in the program. Your help is greatly appreciated.

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  • Events raised by BackgroundWorker not executed on expected thread

    - by Topdown
    A winforms dialog is using BackgroundWorker to perform some asynchronous operations with significant success. On occasion, the async process being run by the background worker will need to raise events to the winforms app for user response (a message that asks the user if they wish to cancel), the response of which captured in an CancelEventArgs type of the event. Being an implementation of threading, I would have expected the RaiseEvent of the worker to fire, and then the worker would continue, hence requiring me to pause the worker until the response is received. Instead however, the worker is held to wait for the code executed by the raise event to complete. It seems like method I am calling via the event call is actually on the worker thread used by the background worker, and I am surprised, since I expected to see it on the Main Thread which is where the mainform is running. Also surprisingly, there are no cross thread exceptions thrown. Can somebody please explain why this is not as I expect?

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  • linq, selecting columns as IEnumerable<DataRow>

    - by joe
    how can i do in linq: IEnumerable<DataRow> query = from rec in dt.AsEnumerable() where rec.Field<decimal>("column2") == 1 && foo(rec.Field<decimal>("column1")) select new { column1 = rec.Field<decimal>("column1"), column2 = rec.Field<decimal>("column2"), column3 = rec.Field<decimal>("column3")} ; this does not work. Im trying to select some columns as new datatable then join it later with some other datatable.

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  • Why do SQL connection leave parameters in?

    - by acidzombie24
    While coding with sqlite everytime i always had the exact number of parameters and when i executed the query i always had 0 parameters after it. I kept using the cmd object and it worked fine. Now while porting to use sql server (2008) my SqlConnection has parameters left over from a successful command. Why? I seem to be able to create tables without the problem (then again i may have use a clone of an empty cmd since i use recursion). Does SqlCommand always leave the parameters in after a query? This always breaks the following query unless i do parameter.clear(). Should i create a new SqlCommand object? or use parameter.clear() each time? I'm somewhat confused.

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  • C# compile finalize method's on runtime?

    - by Royi Namir
    As im reading through 3 books about GC , ive notice some strange fact : C# via CLR CriticalFinalizerObject : the CLR treats this class and classes derived from it in a very special manner what ??? "not find enough memory to COMPILE a method? " IMHO - the code should be already compiled... no ? when Im writing c# code - the whole code is compiled to IL before its running... no? but according to the text - at RUNTIME - he MAY find insufficient memory for compile... Help ?

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  • Maximizing the number of threads to fully utilize all available resources without hindering overall

    - by Matt
    Let's say I have to generate a bunch of result files, and I want to make it as fast as possible. Each result file is generated independently of any other result file; in fact, one could say that each result file is agnostic to every other result file. The resources used to generate each result file is also unique to each. How can I dynamically decide the optimal number of threads to run simultaneously in order to minimize the overall run time? Is my only option to write my own thread manager that watches performance counters and adjust accordingly or does there exists some solid classes that already accomplish this?

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  • Using a Cross Thread Boolean to Abort Thread

    - by Jon
    Possible Duplicate: Can a C# thread really cache a value and ignore changes to that value on other threads? Lets say we have this code: bool KeepGoing = true; DataInThread = new Thread(new ThreadStart(DataInThreadMethod)); DataInThread.Start(); //bla bla time goes on KeepGoing = false; private void DataInThreadMethod() { while (KeepGoing) { //Do stuff } } } Now the idea is that using the boolean is a safe way to terminate the thread however because that boolean exists on the calling thread does that cause any issue? That boolean is only used on the calling thread to stop the thread so its not like its being used elsewhere

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  • Configuration Element Collection Section

    - by Matt
    I would like to set up a custom app configuration element collection section like this <logSectionGroup> <logSection name="Testttt"> <properties name ="Pride"> <pathName="TestingLog.txt"/> <deleteRetention="100"/> <deleteZeroRetention="5"/> <wildcard="*.txt"/> </properties> <properties name ="Adhoc"> <pathName="blah.txt"/> <deleteRetention="70"/> <deleteZeroRetention="3"/> <wildcard="*.*"/> </properties> </logSection> </logSectionGroup> Is this possible? Properties would be the configuration element, and log section would be the configuration element collection. The problem is, I've only seen where you can have multiple instances of a single element instead of multiple elements. <Section name="Section1"> <Section name="Section1"> <SubSection name="SubSection1"> <Item name="Item1" /> <Item name="Item2" /> </SubSection> <SubSection name="SubSection2"> <Item name="Item1" /> <Item name="Item2" /> </SubSection> </Section> When you use GetElementKey() you have it return element "name" in the above example but how would you return 4 different elements like "pathName" "deleteRetention" etc. Here is my Definition for PropElement Public Class PropElement Inherits ConfigurationElement <ConfigurationProperty("pathName", IsRequired:=True)> _ Public Property PathName() As String Get Return CStr(Me("pathName")) End Get Set(ByVal value As String) Me("pathName") = value End Set End Property <ConfigurationProperty("deleteRetention", DefaultValue:="0", IsRequired:=False)> _ Public Property DeleteRetention() As Integer Get Return CStr(Me("deleteRetention")) End Get Set(ByVal value As Integer) Me("deleteRetention") = value End Set End Property <ConfigurationProperty("deleteZeroRetention", DefaultValue:="0", IsRequired:=False)> _ Public Property DeleteZeroRetention() As Integer Get Return CStr(Me("deleteZeroRetention")) End Get Set(ByVal value As Integer) Me("deleteZeroRetention") = value End Set End Property <ConfigurationProperty("wildcard", DefaultValue:="*.*", IsRequired:=False)> _ Public Property Wildcard() As String Get Return CStr(Me("wildcard")) End Get Set(ByVal value As String) Me("wildcard") = value End Set End Property End Class

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  • Getting table schema from a query

    - by Appu
    As per MSDN, SqlDataReader.GetSchemaTable returns column metadata for the query executed. I am wondering is there a similar method that will give table metadata for the given query? I mean what tables are involved and what aliases it has got. In my application, I get the query and I need to append the where clause programically. Using GetSchemaTable(), I can get the column metadata and the table it belongs to. But even though table has aliases, it still return the real table name. Is there a way to get the aliase name for that table? Following code shows getting the column metadata. const string connectionString = "your_connection_string"; string sql = "select c.id as s,c.firstname from contact as c"; using(SqlConnection connection = new SqlConnection(connectionString)) using(SqlCommand command = new SqlCommand(sql, connection)) { connection.Open(); SqlDataReader reader = command.ExecuteReader(CommandBehavior.KeyInfo); DataTable schema = reader.GetSchemaTable(); foreach (DataRow row in schema.Rows) { foreach (DataColumn column in schema.Columns) { Console.WriteLine(column.ColumnName + " = " + row[column]); } Console.WriteLine("----------------------------------------"); } Console.Read(); } This will give me details of columns correctly. But when I see BaseTableName for column Id, it is giving contact rather than the alias name c. Is there any way to get the table schema and aliases from a query like the above? Any help would be great!

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  • how to access items from datalist

    - by kenom
    How to access to Label5 from behind page file(default.aspx.cs)? <ItemTemplate> <asp:Image ID="Image1" runat="server" /> <asp:HyperLink ID="HyperLink1" CssClass="nav_url_odg" runat="server"><%# Eval("user") %></asp:HyperLink> <span class="odgovorio">je odgovorio:</span><br /> <div> <asp:Label ID="Label5" runat="server" Text=""></asp:Label></div> </div> <br /></div> </div> </ItemTemplate> </asp:DataList>

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  • Tutorial for Examine/Lucene

    - by Kumar
    I am interested in Examine for building searching in a standalone desktop app for searching db tables as well as office/.pdf files This looks like an excellent scenario for Lucene/examine However the doc there is minimal and while i have plenty of experience with SQL full text search, Lucene is a different beast altogether and hence looking for help/pointers on how/where to start And yes, i did a google search but did not find any resources as the terms are fairly common ( lucene examine tutorial etc. )

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  • How can I get an IObservable<T> in Rx from a "non-standard" event?

    - by Dan Tao
    Here's what I mean. Suppose I'm working with an API that exposes events, but these events do not follow the standard EventHandler or EventHandler<TEventArgs> signature. One event might look like this, for instance: Public Event Update(ByVal sender As BaseSubscription, ByVal e As BaseEvent) Now, typically, if I want to get an IObservable<TEventArgs> from an event, I can just do this: Dim updates = Observable.FromEvent(Of UpdateEventArgs)( _ target:=updateSource, _ eventName:="Update" _ ) But this doesn't work, because the Update event is not an EventHandler<UpdateEventArgs> -- in fact, there is no UpdateEventArgs -- it's basically just its own thing. Obviously, I could define my own class deriving from EventArgs (i.e., UpdateEventArgs), write another class to wrap the object providing the Update event, give the wrapper class its own Update event that is an EventHandler<UpdateEventArgs>, and get an IObservable<UpdateEventArgs> from that. But that's an annoying amount of work. Is there some way to create an IObservable<[something]> from a "non-standard" event like this, or am I out of luck?

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  • Versioning issues with assemblies

    - by devoured elysium
    Let's assume I have two assemblies: MyExecutable.dll version 1.0.0 MyClassLibrary.dll version 1.0.0 Now, MyExecutable.dll currently uses MyClassLibrary.dll's classes and methods (which include some algorithms). Most of those algorithms were made on the run, being that later I'll want to refine them if needed. This means, I won't change the interface of those classes but the code itself will see some changes. The question at hand is, MyExecutable.dll will be expecting MyClassLibrary.dll 1.0.0 and I'll want it to use version 1.0.1 (or something like that). I don't want to have to recompile MyExecutable.dll(because actually there might be more than just one executable using MyClassLibrary.dll). Is there a solution for this problem? I've heard about the GAC, but if possible I'd like to stay away from it. Thanks

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  • How to override event on a UserControl

    - by Vadim
    Hello! I have a WinForms application (OwnerForm) with some UserControl. When textbox of UserControl is changed, I want to filter content of a OwnerForm. But how can I make it? I don't want to specify OwnerForm inside the user control. I know a solution to add manually handlers for MyUserControl.tb.TextChanged to some functions on a owner form, but I think it's bad way. I'll prefer to have overridable functions, but I can't imagine how to do it. Any suggestions? Thanks in advance,

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  • modalpopupextender.Show() wont fire

    - by Peter Lea
    I'm pretty new to developing for the web so bare with me. I have a company page with multiple locations and emails etc at each of these addresses. The idea is to have a single modalpopup to edit each type of data (one for email, one for urls, one for addresses etc). I link the modalpopupextender to a hiddenbutton and then call an edit function from various places where I can populate some hiddenfields and textboxes in the panel before showing it. The code executes but it just wont show the damn popup, I just see a flash and can't figure out if its my panel, my css or something I don't understand about ajax and postbacks etc. Things i've tried after reading various threads: Disable smart navigation in web.config Move ToolKitScriptManager up to master page and use proxy in content set hiddenbutton to use style="display:none" tried links etc instead of hidden button Heres my code CSS .modalBackground { position: absolute; z-index: 100; top: 0px; left: 0px; background-color: #000; filter: alpha(opacity=60); -moz-opacity: 0.6; opacity: 0.6; } .modalPopup { background-color: #FFD; border-width: 3px; border-style: solid; border-color: gray; padding: 3px;} Asp/html <ajaxToolkit:ModalPopupExtender runat="server" ID="mpe_email" BackgroundCssClass="modalBackground" PopupControlID="modal_email" CancelControlID="btn_cancel_email" TargetControlID="fake_btn_email" /> <asp:Button ID="fake_btn_email" runat="server" Text="email" style="display:none;" /> <asp:panel id="modal_email" runat="server" class="modalPopup" Width="500px" Height="500px"> <asp:HiddenField ID="hf_modal_email_location_id" runat="server" Value="" /> <asp:HiddenField ID="hf_modal_email_contact_id" runat="server" Value="" /> <asp:HiddenField ID="hf_modal_email_comms_id" runat="server" Value="" /> <table width="100%"> <tr> <td> <asp:Label ID="lbl_mpe_email_title" runat="server" Text="Edit Email Address" /> </td> </tr> <tr> <td> <table width="100%"> <tr> <td width="40px"><img src="../images/email.png" height="30px" width="30px"/></td> <td> <table width="100px"> <tr> <td><span>Quick Ref: <asp:TextBox ID="txb_mpe_email_qref" runat="server" Text="" /></span></td> </tr> <tr> <td><span>Email Address: <asp:TextBox ID="txb_mpe_email_address_full" runat="server" Text="" /></span></td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td width="40px" align="left"><asp:Button ID="btn_cancel_email" runat="server" Text="Cancel"/></td> <td align="right"><asp:Button ID="btn_save_email" runat="server" Text="Save" OnCommand="save_modal_email" /></td> </tr> <tr> <td colspan="2" align="right"><asp:Label ID="lbl_mpe_email_err" runat="server" Text="" /></td> </tr> </table> c# public void oloc_ocon_email_edit(object sender, RepeaterCommandEventArgs e) { switch (e.CommandName) { case "edit": hf_modal_email_location_id.Value = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_location_id")).Value; hf_modal_email_contact_id.Value = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_contact_id")).Value; hf_modal_email_comms_id.Value = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_comms_id")).Value; lbl_mpe_email_title.Text = "Edit Email Address"; txb_mpe_email_qref.Text = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_qref")).Value; txb_mpe_email_address_full.Text = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_email_full")).Value; lbl_mpe_email_err.Text = ""; mpe_email.Show(); break; case "new": hf_modal_email_location_id.Value = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_location_id_p")).Value; hf_modal_email_contact_id.Value = ((HiddenField)e.Item.FindControl("hf_oloc_ocon_emails_contact_id_p")).Value; hf_modal_email_comms_id.Value = "0"; lbl_mpe_email_title.Text = "New Email Address"; txb_mpe_email_qref.Text = ""; txb_mpe_email_address_full.Text = ""; lbl_mpe_email_err.Text = ""; mpe_email.Show(); break; } } Stuff makes so much more sense in a desktop environment, I hope someone can point me in the right direction. Thanks

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  • Custom DataGridView column sort based on Value not Formatted value

    - by Dan Neely
    I have a custom DGV cell I'm using to display the contents of MyType objects. To control how they're being formatted I'm overriding the GetFormattedValue() and FormattedvalueType methods of DataGridViewTextBoxCell because in this case I don't want to use the default ToString() method. The problem is that when I do this the DGV is sorting the column by the string in FormattedValue instead of by Value. I'm not seeing a method I can override to change the sort behavior of the column. While I know I can, I don't want to have to write custom Sort mthods for the DGVs themselves because I'm using this in multiple DGV's.

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  • DataSet v/s Database

    - by Hemanshu Bhojak
    While designing applications it is a very good practice to have all the business logic in one place. So why then we sometimes have the business logic in stored procs? Can we fetch all data from the DB and store it in a DataSet and then process it? What would be the performance of the app in this scenario?

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  • Having problem reaching client which don't have static ip address

    - by user317311
    i am making a messenger over internet. it has a server which listens to clients but when it try to send the reply to any request to client it shows the error of client not found. however my clients are connecting to that server because it has a static ip address and live server. having problem reaching client because they can be behind any firewall or network and dont have static ip addresses. so how can i reach to my client?? any Suggestions..

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  • Faster way to clone.

    - by AngryHacker
    I am trying to optimize a piece of code that clones an object: #region ICloneable public object Clone() { MemoryStream buffer = new MemoryStream(); BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(buffer, this); // takes 3.2 seconds buffer.Position = 0; return formatter.Deserialize(buffer); // takes 2.1 seconds } #endregion Pretty standard stuff. The problem is that the object is pretty beefy and it takes 5.4 seconds (according ANTS Profiler - I am sure there is the profiler overhead, but still). Is there a better and faster way to clone?

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  • Single Query returning me 4 tables, How to get all of them back into dataset ?

    - by Shantanu Gupta
    How to fill multiple tables in a dataset. I m using a query that returns me four tables. At the frontend I am trying to fill all the four resultant table into dataset. Here is my Query. Query is not complete. But it is just a refrence for my Ques Select * from tblxyz compute sum(col1) suppose this query returns more than one table, I want to fill all the tables into my dataset I am filling result like this con.open(); adp.fill(dset); con.close(); Now when i checks this dataset. It shows me that it has four tables but only first table data is being displayed into it. rest 3 dont even have schema also. What i need to do to get desired output

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  • how VAR is determined against many options?

    - by Royi Namir
    i have this code : IEnumerable<string> q = customers /*EF entity*/ .Select (c => c.Name.ToUpper()) .OrderBy (n => n) To select entity, ObjectContext actually create ObjectQuery, which implement IQueryable. The object return from ObjectQuery, is not normal object, but EntityObject but what if i write : ( notice the var) var q = customers /*EF entity*/ .Select (c => c.Name.ToUpper()) .OrderBy (n => n) it can be determined both to ienumerable or iqueryable : because ObjectQuery Also implements IEnumerable... i dont know if there's any specific info which tell the compiler "use A and not B. A is more specific..." ( there must be...i just cant find it) any help ? how will it know to use A || B ?

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  • When are predicates appropriate and what is the best pattern for usage

    - by Maxim Gershkovich
    When are predicates appropriate and what is the best pattern for usage? What are the advantages of predicates? It seems to me like most cases where a predicate can be employed a tight loop would accomplish the same functionality? I don’t see a reusability argument given you will probably only implement a predicate in one method right? They look and feel nice but besides that they seem like you would only employ them when you need a quick hack on the collection classes? UPDATE But why would you be rewriting the tight loop again and again? In my mind/code when it comes to collections I always end up with something like Class Person End Class Class PersonList Inherits List(Of Person) Function FindByName(Name) as Person tight loop.... End Function End Class @Ani By that same logic I could implement the method as such Class PersonList Inherits List(Of Person) Function FindByName(Name) as PersonList End Function Function FindByAge(Age) as PersonList End Function Function FindBySocialSecurityNumber(SocialSecurityNumber) as PersonList End Function End Class And call it as such Dim res as PersonList = MyList.FindByName("Max").FindByAge(25).FindBySocialSecurityNumber(1234) and the result along with the amount of code and its reusability is largely the same, no? I am not arguing just trying to understand.

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