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  • SQL Compact 2008 Connection String Problem

    - by Seth
    I have the following code to connect to a sql server compact edition 2008: private SqlConnection sqlConn; public void createConnection() { String connectionString = @"Data Source=C:\Projects\somefile.sdf;Persist Security Info=False"; sqlConn = new SqlConnection(connectionString); sqlConn.Open(); } However, I keep getting the following error when sqlConn.Open() is executed: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Does anyone have any ideas what the problem might be? I can create a connection to the db in the database explorer but it doesn't seem to work in code.

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  • implementing user tracking (logging) in Rails 3

    - by seth.vargo
    Hi, I'm creating a Rails application in which logging individual user actions is vital. Every time a user clicks a url, I want to log the action along with all parameters. Here is my current implementation: class CreateActivityLogs < ActiveRecord::Migration create_table :activity_logs do |t| t.references :user t.string :ip_address t.string :referring_url t.string :current_url t.text :params t.text :action t.timestamps end end   class ActivityLog < ActiveRecord::Base belongs_to :user end In a controller, I'd like to be able to do something like the following: ... ActivityLog::log @user.id, params, 'did foo with bar' ... I'd like to have the ActivityLog::log method automatically get the IP address, referring url, and current url (I know how to do this already) and create a new record in the table. So, my questions are: How do I do this? How do I use ActivityLog without having to create an instance everytime I want to log? Is this the best way? Some people have argued for a flat-file log for this kind of logging - however, I want admins to be able to see a user's activity in the backend as well, so I thought a database solution may be better?

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  • F# in 90 Seconds

    - by Ben Griswold
    I mentioned in a previous post that we’ve started a languages club at the office.  In an effort to decide which language we will first concentrate on, I volunteered to give the rundown on F#.  Rather than providing a summary here, I’ve provided my slide deck for your viewing enjoyment.  There’s nothing special here outside of a some pretty cool characters from The 56 Geeks Project by Scott Johnson and collection of information from my prior functional programming presentations.   Download F# in 90 Seconds

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  • Hands-on Entity Framework

    People keep saying that Entity Framework is simple to learn. Simple? Well, finally, we're going to be forced to agree, thanks to James Johnson's new series on learning EF the hands-on way.

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  • ArchBeat Link-o-Rama for 2012-04-05

    - by Bob Rhubart
    Webcast: Oracle Maximum Availability Architecture Best Practices event.on24.com Date: Thursday, April 12, 2012 Time: 10:00 AM PDT Oracle expert Tom Kyte discusses how Oracle’s Maximum Availability Architecture can help to minimize the costs and risk of downtime. Oracle Enterprise Manager Ops Center 12c Launch - Interactive Webcast and Live Chat www.oracle.com Thursday, April 12, 2012. 9 a.m. PT / 12 p.m. ET / 4 p.m. GMT. Speakers: Steve Wilson (VP Systems Management, Oracle) John Fowler (Exec VP Systems, Oracle) Brad Cameron (VP Development, Oracle Fusion Middleware) Bill Nesheim (VP Oracle Solaris) Dennis Reno (VP Customer Portal Experience, Oracle) Mike Wookey (Chief Architect, Oracle Enterprise Manager Ops Center) Prasad Pai (Sr Director, Oracle Enterprise Manager Ops Center) 2012 Real World Performance Tour Dates |Performance Tuning | Performance Engineering www.ioug.org Coming to your town: a full day of real world database performance with Tom Kyte, Andrew Holdsworth, and Graham Wood. Rochester, NY - March 8 Los Angeles, CA - April 30 Orange County, CA - May 1 Redwood Shores, CA - May 3 Oracle Technology Network Developer Day: MySQL - New York www.oracle.com Wednesday, May 02, 2012 8:00 AM – 4:30 PM Grand Hyatt New York 109 East 42nd Street, Grand Central Terminal New York, NY 10017 Webcast Series: Data Warehousing Best Practices event.on24.com April 19, 2012 - Best Practices for Workload Management of a Data Warehouse on Oracle Exadata May 10, 2012 - Best Practices for Extreme Data Warehouse Performance on Oracle Exadata How to create a Global Rule that stores a document’s folder path in a custom metadata field | Nicolas Montoya blogs.oracle.com An illustrated how-to from Oracle Fusion Middleware A-Team blogger Nicolas Montoya. Get Proactive with Fusion Middleware | Daniel Mortimer blogs.oracle.com Daniel Mortimer shows how to access "a one stop shop for navigating to proactive support material, tools, and communication channels related to Oracle Fusion Middleware." Build an enterprise on 'other peoples' work', via SOA and cloud | Joe McKendrick www.zdnet.com Are you down with OPW? Joe McKendrick's synopsis of a recent presentation by David Linthicum focuses on reuse. Oracle Fusion Middleware Security: Unsolicited login with OAM 11g | Chris Johnson fusionsecurity.blogspot.com Chris Johnson shows how to create a shopping cart login model using "plain old HTML." How to use the Human WorkFlow Web Services | Edwin Biemond biemond.blogspot.com Oracle ACE Edwin Biemond shows how to invoke two WorkFlow web services to query the Human task in Oracle SOA Suite with your own ordering and restrictions. Bad Practice Use Case for LOV Performance Implementation in ADF BC | Andrejus Baranovskis andrejusb.blogspot.com "If you want to learn something well, there is nothing better [than] to learn bad practices first," says Oracle ACE Director Andrejus Baranovskis. Thought for the Day "The best meetings get real work done. When your people learn that your meetings actually accomplish something, they will stop making excuses to be elsewhere." — Larry Constantine

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  • Evènement annuel SpringOne 2GX, à Chicago du 19 au 22 Octobre 2010. Les inscriptions sont ouvertes

    Si l'évènement SpringOne 2GX Europe n'a pas été renouvelé cette année, son équivalent US est annoncé par SpringSource. Cette série de conférence organisée par SpringSource et No Fluff Just Stuff aura lieu cette année à Chicago du 19 au 22 Octobre. Comme l'an passé, les sujets seront regroupés autours de deux thèmes : Spring présenté, entre autre, par Rod Johnson (Créateur de Spring Framework), Rob Harrob (Dm Server) , Adrian Col...

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  • Windows Azure Server Supported by RealCloud Pro

    CopperEgg CEO Scott Johnson commented on the new release: RevealCloud Pro is quickly gaining traction with our customers deploying and managing services in the cloud, virtual environments and data centers. The addition of server monitoring for Windows Azure addresses the needs of developers building services on the Azure platform as well as hybrid environments, who are looking for a robust server monitoring solution that is quickly deployed, easy to use and provides instant insight into server health. The key benefits provided by RevealCloud Pro's server monitoring begin with its flexibilit...

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  • Multiselect combobox with ExtJs

    - by Justin Johnson
    How do you implement a multiselect combobox as part of a Ext.FormPanel using ExtJs? I've been looking, but can't seem to find a solution that is compatible with the latest version of ExtJs (this question is similar, but doesn't have a working/current solution). This is what I have so far, but it's a single select: new Ext.FormPanel({ labelAlign: 'top', frame: true, width: 800, items: [{ layout: 'column', items:[{ columnWidth: 1, layout: 'form', items: [{ xtype: 'combo', fieldLabel: 'Countries', name: 'c[]', anchor: '95%', allowBlank: false, typeAhead: true, triggerAction: 'all', lazyRender: true, mode: 'local', store: new Ext.data.ArrayStore({ id: 0, fields: ['myId', 'displayText'], data: [ ["CA", 'Canada'], ["US", 'United States'], ["JP", 'Japan'], ] }), valueField: 'myId', displayField: 'displayText' }] }] }] }).render(document.body); I didn't see any parameters in the documentation that suggests that this is supported. I also found this and this but I could only get them working with Ext 2.

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  • DotNetOpenAuth OpenID Provider "Sequence contains more than one element"

    - by Matthew Johnson
    Hello, all, I'm having trouble implementing my OpenID provider with DNOA 3.4.3. Everything was going absolutely peachy until I needed AX support as well. I set AXFetchAsSregTransform in the web config, as recommended by Andrew at http://groups.google.com/group/dotnetopenid/browse_thread/thread/5629a24c0a7e8d99. Doing this caused me to get the exception "Sequence Contains More Than One Element" on my decide.aspx page, however, and I haven't been able to get past it. The following line is throwing the exception: Edit: Strangely enough, this is not the line throwing the error anymore. The SendResponse() is now triggering the exception ClaimsRequest requestedFields = ProviderEndpoint.PendingRequest.GetExtension(); ProviderEndpoint.SendResponse() Any thoughts on why this may be? Any help would be greatly appreciated! The logs leading up to the error are as follows: 2010-04-28 12:38:20,247 (GMT-7) [5] INFO DotNetOpenAuth.Messaging.Channel - Scanning incoming request for messages: https://myprovider/provider.ashx?openid.ns=http%3A%2F%2Fspecs.openid.net%2Fauth%2F2.0&openid.claimed_id=http%3A%2F%2Fspecs.openid.net%2Fauth%2F2.0%2Fidentifier_select&openid.identity=http%3A%2F%2Fspecs.openid.net%2Fauth%2F2.0%2Fidentifier_select&openid.mode=checkid_setup&openid.ns.ext1=http%3A%2F%2Fopenid.net%2Fsrv%2Fax%2F1.0&openid.ext1.mode=fetch_request&openid.ext1.type.email=http%3A%2F%2Faxschema.org%2Fcontact%2Femail&openid.ext1.type.fullname=http%3A%2F%2Faxschema.org%2FnamePerson&openid.ext1.type.language=http%3A%2F%2Faxschema.org%2Fpref%2Flanguage&openid.ext1.required=email&openid.return_to=http%3A%2F%2Fmyrelyingparty%2Flogin.jsp%3Foidreturn%3D%252Fhome&openid.assoc_handle=%7B634080802953194640%7D%7BHxjFNw==%7D%7B20%7D&openid.realm=http%3A%2F%2Fmyrelyingparty 2010-04-28 12:38:20,285 (GMT-7) [5] INFO DotNetOpenAuth.Messaging.Channel - Processing incoming CheckIdRequest (2.0) message: openid.claimed_id: http://specs.openid.net/auth/2.0/identifier_select openid.identity: http://specs.openid.net/auth/2.0/identifier_select openid.assoc_handle: {634080802953194640}{HxjFNw==}{20} openid.return_to: http://myrelyingparty/login.jsp?oidreturn=%2Fhome openid.realm: http://myrelyingparty/ openid.mode: checkid_setup openid.ns: http://specs.openid.net/auth/2.0 openid.ns.ext1: http://openid.net/srv/ax/1.0 openid.ext1.mode: fetch_request openid.ext1.type.email: http://axschema.org/contact/email openid.ext1.type.fullname: http://axschema.org/namePerson openid.ext1.type.language: http://axschema.org/pref/language openid.ext1.required: email 2010-04-28 12:38:22,773 (GMT-7) [14] INFO DotNetOpenAuth.Messaging.Channel - Scanning incoming request for messages: https://myprovider/login.aspx?ReturnUrl=%2fdecide.aspx 2010-04-28 12:38:36,167 (GMT-7) [5] INFO DotNetOpenAuth.Messaging.Channel - Scanning incoming request for messages: https://myprovider/login.aspx?ReturnUrl=%2fdecide.aspx 2010-04-28 12:38:38,147 (GMT-7) [14] ERROR DotNetOpenAuth.Messaging - Protocol error: An HTTP request to the realm URL (http://myrelyingparty/) resulted in a redirect, which is not allowed during relying party discovery. at DotNetOpenAuth.Messaging.ErrorUtilities.VerifyProtocol(Boolean condition, String message, Object[] args) at DotNetOpenAuth.OpenId.Realm.Discover(IDirectWebRequestHandler requestHandler, Boolean allowRedirects) at DotNetOpenAuth.OpenId.Realm.DiscoverReturnToEndpoints(IDirectWebRequestHandler requestHandler, Boolean allowRedirects) at DotNetOpenAuth.OpenId.Provider.HostProcessedRequest.IsReturnUrlDiscoverableCore(OpenIdProvider provider) at DotNetOpenAuth.OpenId.Provider.HostProcessedRequest.IsReturnUrlDiscoverable(OpenIdProvider provider) at OpenIdProviderWebForms.decide.Page_Load(Object src, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.decide_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error) at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) 2010-04-28 12:38:38,149 (GMT-7) [14] INFO DotNetOpenAuth.Yadis - Relying party discovery at URL http://myrelyingparty/ failed. DotNetOpenAuth.Messaging.ProtocolException: An HTTP request to the realm URL (http://myrelyingparty/) resulted in a redirect, which is not allowed during relying party discovery. at DotNetOpenAuth.Messaging.ErrorUtilities.VerifyProtocol(Boolean condition, String message, Object[] args) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\Messaging\ErrorUtilities.cs:line 235 at DotNetOpenAuth.OpenId.Realm.Discover(IDirectWebRequestHandler requestHandler, Boolean allowRedirects) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Realm.cs:line 446 at DotNetOpenAuth.OpenId.Realm.DiscoverReturnToEndpoints(IDirectWebRequestHandler requestHandler, Boolean allowRedirects) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Realm.cs:line 424 at DotNetOpenAuth.OpenId.Provider.HostProcessedRequest.IsReturnUrlDiscoverableCore(OpenIdProvider provider) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Provider\HostProcessedRequest.cs:line 142 2010-04-28 12:38:42,076 (GMT-7) [8] ERROR OpenIdProviderWebForms.Global - An unhandled exception was raised. Details follow: System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. --- System.InvalidOperationException: Sequence contains more than one element at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source) at DotNetOpenAuth.OpenId.Provider.Request.GetExtension[T]() in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Provider\Request.cs:line 176 at DotNetOpenAuth.OpenId.Extensions.ExtensionsInteropHelper.ConvertSregToMatchRequest(IHostProcessedRequest request) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Extensions\ExtensionsInteropHelper.cs:line 180 at DotNetOpenAuth.OpenId.Behaviors.AXFetchAsSregTransform.DotNetOpenAuth.OpenId.Provider.IProviderBehavior.OnOutgoingResponse(IAuthenticationRequest request) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Behaviors\AXFetchAsSregTransform.cs:line 139 at DotNetOpenAuth.OpenId.Provider.OpenIdProvider.ApplyBehaviorsToResponse(IRequest request) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Provider\OpenIdProvider.cs:line 482 at DotNetOpenAuth.OpenId.Provider.OpenIdProvider.SendResponse(IRequest request) in c:\TeamCity\buildAgent\work\bf9e2ca68b75a334\src\DotNetOpenAuth\OpenId\Provider\OpenIdProvider.cs:line 325 at OpenIdProviderWebForms.decide.Yes_Click(Object sender, EventArgs e) in C:\Projects\OpenIdProviderWebForms\decide.aspx.cs:line 130 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace --- at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.decide_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\7f580b93\b3e4d917\App_Web_tulh9ymv.1.cs:line 0 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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  • Slow loading jQuery Autocomplete

    - by Andrew G. Johnson
    Hi I am building an internal app for my company using jQuery's autocomplete and am finding it tends to start off very slow. My assumption is that the bottle neck is perhaps adding its elements to the DOM since after the first query it seems to be substantially speedier. Does anyone know of a way to pre-load these elements on page load instead of doing it for the first time when the user starts typing?

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  • WebSocket handshake with Ruby and EM::WebSocket::Server

    - by Chad Johnson
    I am trying to create a simple WebSocket connection in JavaScript against my Rails app. I get the following: WebSocket connection to 'ws://localhost:4000/' failed: Error during WebSocket handshake: 'Sec-WebSocket-Accept' header is missing What am I doing wrong? Here is my code: JavaScript: var socket = new WebSocket('ws://localhost:4000'); socket.onopen = function() { var handshake = "GET / HTTP/1.1\n" + "Host: localhost\n" + "Upgrade: websocket\n" + "Connection: Upgrade\n" + "Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\n" + "Sec-WebSocket-Protocol: quote\n" + "Sec-WebSocket-Version: 13\n" + "Origin: http://localhost\n"; socket.send(handshake); }; socket.onmessage = function(data) { console.log(data); }; Ruby: require 'rubygems' require 'em-websocket-server' module QuoteService class WebSocket < EventMachine::WebSocket::Server def on_connect handshake_response = "HTTP/1.1 101 Switching Protocols\n" handshake_response << "Upgrade: websocket\n" handshake_response << "Connection: Upgrade\n" handshake_response << "Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk=\n" handshake_response << "Sec-WebSocket-Protocol: quote\n" send_message(handshake_response) end def on_receive(data) puts 'RECEIVED: ' + data end end end EventMachine.run do print 'Starting WebSocket server...' EventMachine.start_server '0.0.0.0', 4000, QuoteService::WebSocket puts 'running' end The handshake headers are per Wikipedia.

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  • Merge Cells Vertically in RTF

    - by Jimmy Johnson
    I need to programmatically generate an RTF document with a table that has a column vertically merged., e.x. ______________________________ | merged | foo | hello | | cell | | | | right |--------|----------| | here | bar | world | |_________|________|__________| I looked up online and found that the codes are \clvmgf and \clvmrg but I can't find a decent example. I made a text rtf using MS word, but there's too much junk rtf codes in it for me to figure it out where to put the \clvmgf and \clvmrg to get this to work. Could someone give me an rtf for above example table with no extraneous rtf codes so I can figure out how \clvmgf and \clvmrg works? Any additional explanation would also be greatly appreciated. Thanks!

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  • How to Delete a Virtual Directory from an FTP Site in IIS 7 and IIS 7.5 using C#/VB.Net and WMI?

    - by Steve Johnson
    Hi all. I hope everybody is doing fine. I try to delete a virtual directory using WMi (Server Manager Class) and recreate with different values. The problem i am facing is that the virtual directory is not getting deleted. Please help. Here is my code. Try Using mgr As New ServerManager() Dim site As Site = mgr.Sites(DomainName) Dim app As Application = site.Applications("/") '.CreateElement() '("/" & VirDirName) Dim VirDir As VirtualDirectory = app.VirtualDirectories.CreateElement() For Each VirDir In app.VirtualDirectories If VirDir("path") = "/" & VirDirName Then app.VirtualDirectories.Remove(VirDir) Exit For End If Next mgr.CommitChanges() End Using Catch Err As Exception Ex = Err Throw New Exception(Err.Message, Ex) End Try

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  • Angle and Length of Wind Barb Flags

    - by Kristopher Johnson
    I am working on an application that displays surface winds. Wind speed and direction will be displayed using "wind barb" symbols, as described here: Plotted Winds My question: Are there any standards for the angles and lengths of the "flags" in relation to the the wind-barb "pole"? Eyeballing the diagrams I've seen, I think that an angle of 60 degrees and a flag length about a third as long as the pole length would look fine, but if there are any officially defined standards for these symbols, I'd like to follow them. Note: This app will not be used for navigation, so it is not very important that it look exactly like an official chart. I just don't want it to be ugly, or to look obviously wrong to a knowledgeable user.

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  • Constant opacity with glBlendFunc on iPhone

    - by Jeff Johnson
    What glBlendFunc should I use to ensure that the opacity of my drawing is always the same? When I use glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) and multiple images are drawn on top of each other, the result is more and more opaque until it's completely opaque after a certain number of imgaes. The closest I have come is to use glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA) which maintains a constant opacity no matter how many images are on top of each other, although there is a slight variation in opacity if the images overlap each other. Any other render states I should consider trying? Any other ideas? I am making a drawing app for my kid and I don't want the images (brush) they draw to cover up the background. Heres the closest I've got: I want to have it so that the overlap part of the circles is the same color and opacity as the center part of the circle. I am using cocos2d iphone v. 0.99

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  • Best way to detect integer overflow in C/C++

    - by Chris Johnson
    I was writing a program in C++ to find all solutions of a^b = c (a to the power of b), where a, b and c together use all the digits 0-9 exactly once. The program looped over values of a and b, and ran a digit-counting routine each time on a, b and a^b to check if the digits condition was satisfied. However, spurious solutions can be generated when a^b overflows the integer limit. I ended up checking for this using code like: unsigned long b, c, c_test; ... c_test=c*b; // Possible overflow if (c_test/b != c) {/* There has been an overflow*/} else c=c_test; // No overflow Is there a better way of testing for overflow? I know that some chips have an internal flag that is set when overflow occurs, but I've never seen it accessed through C or C++.

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  • POCO Best Practice

    - by Paul Johnson
    All, I have a series of domain objects (project is NHibernate based). Currently as per 'good practice' they define only the business objects, comprising properties and methods specific to each objects function within the domain. However one of the objects has a requirement to send an SMTP message. I have a simple SMTP client class defined in a separate 'Utilities' assembly. In order to use this mail client from within the POCO, I would need to hold a reference to the utilities assembly in the domain. My query is this... Is it a departure from best practice to hold such a reference in a POCO, for the purpose of gaining necessary business functionality. Kind Regards Paul J.

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  • Properly handling possible System.NullReferenceException in lambda expressions

    - by Travis Johnson
    Here's the query in question return _projectDetail.ExpenditureDetails .Where(detail => detail.ProgramFund == _programFund && detail.Expenditure.User == _creditCardHolder) .Sum(detail => detail.ExpenditureAmounts.FirstOrDefault( amount => amount.isCurrent && !amount.requiresAudit) .CommittedMonthlyRecord.ProjectedEac); Table Structure ProjectDetails (1 to Many) ExpenditureDetails ExpenditureDetails (1 to Many) ExpenditureAmounts ExpenditureAmounts (1 to 1) CommittedMonthlyRecords ProjectedEac is a decimal field on the CommittedMonthlyRecords. The problem I discovered in a Unit test (albeit an unlikely event), that the following line could be null: detail.ExpenditureAmounts.FirstOrDefault( amount => amount.isCurrent && !amount.requiresAudit) My original query was a nested loop, in where I would be making multiple trips to the database, something I don't want to repeat. I've looked in to what seemed like some similar questions here, but the solution didn't seem to fit. Any ideas?

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