Articles for Csharp and ASP dot net

Call multiple ajax calls in sequence, rather than all at the same time

Visual Studio Profiler setup

This will show the slowest functions in your code.

How to set up SignalR in MVC3, asp.net 4.6, in VS2013

Web scraping with html agility pack

Make Select2 Dropbox to work like an autocomplete

Load data based on what you type instead of loading all of it together

How to create a unique reference number

Ascii art - excel to source code table

If you want to paste an example from excel into your source code - use this

ASP.NET Error Messages

The following error messages are those typically encountered due to site configuration and other general conditions that are not obvious compilation or runtime errors. As our standard platform is ASP.NET MVC 2, many of the solutions assume that is the platform. If you get an IIS error that you ca...

simple sync code

If you need to sync something from an API or service based data source, with a local db - here is an example.

ABC PDF Versions Mismatch - update!

Error: Collection was modified; enumeration operation may not execute

Ignore service end point security errors

When in server to server discussion, is it ok to ignore the cert errors?

Lawson M3 / Infor web service calls

Lawson M3 / Infor web service calls

Image drawing example

How to draw a custom image using c# code

How to write an mvc view to a string

useful when returning ajax

HTML fragments in view page - can be called over and over - eg in a loop

When you are writing a report, sometimes you have a chunk of html that you need to call over and over - like subtotal. You can use an Action and an anoymous 'function' full of html to do this. - like a renderaction and an ascx, but inline on the page. This reduces files in the project, and you dont need an actionresult method in the controller.

How to use jsonp and mvc to cross domains when we control both domains

Sometimes you need to call ajax on a different server. Thies is how to use jsonp and mvc to cross domains when we control both domains

C# How to sort a list that is already in memory

Here is how, with an example of sorting a structured memory object using icomparer

World Clock

Time Calculator

Access to the registry key 'Global' is denied

A workaround to this issue

Colourbox and forms

Problems when forms disappear from colorbox (colorpowered)

C# timer, how to add duration to a page

page / function timer code

Sample email template code

How to send email from c# using a textblock template

Routing issues in MVC

I had an issue when including a warningbar in admin, caused by strange routing behaviour in MVC related to html.renderaction and html.action

Cookie as a property get/set

Code snippet for creating a PDF from an HTML page using abcpdf

This function calls an html page, creates a pdf from it, saves it to a month stamped folder /// /// note: to add page break, add around the place /// /// file name of pdf created public string BuildPdf_ABCPDF() { //create document //String htmlText = ""; var newFileName ...

HTTPget sync and async version

Sometimes you need to read a remote ( or local ) web page for scraping the content or ajax save, etc. Async version has been tested by calling it 10000 times, and watching the threads for leaks - no problems found. This is good when you want to do a lengthy process in the background, when the use...

abcPDF installation errors

IE9 Issues abcPDF uses the MSHtml rendering engine that is built in to windows on the server. If IE is upgraded to IE9 this can cause an issue where a previously relied on GDI call is no longer available. IE8 will be upgraded automatically to IE9 via windows update unless you are careful with windo...

How to set up a development environment

In order to make a stand alone dev system (on a laptop for example), you need to go to the following place: http://www.microsoft.com/express Get a copy of : - visual studio express 2010, c#.net addition http://www.microsoft.com/visualstudio/en-us/products/2010-editions/visual-web-developer-exp...

Security

AntiXSS and Anti SQL Injection engine and encoders - looks interesting if we find our existing solutions inadequate http://wpl.codeplex.com/

How to sort a sql query in memory

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test35.aspx.cs" Inherits="Test35" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="Beweb" %> <html> <head> <title></title> </head> <body> <% var sql = new Sql("selec...

ABCpdf dot NET Manual Installation

UPDATE: see http://www.websupergoo.com/helppdf7net/source/3-concepts/6-installation.htm since we are using version 7 on Edna for reference see http://www.websupergoo.com/helppdf5net/source/3-concepts/6-installation.htm To do this you will need the files: - ABCpdf.dll (C:\Program Files\WebSupergoo...

How to do an 'include' or user control (ascx) in MVC, and pass data or model to it

How to do an 'include' in MVC, and pass data to it. in aspx <%Html.RenderAction<LifeInsuranceController>(controller=>controller.PopHealthRespiratory(record)); %> in controller. Note: record is the typed data you are passing to the ascx view public ActionResult PopHealthRespir...

C Sharp Collection Classes

How to choose a Collection type in .NET .NET contains many different collection types and they all have slightly different behaviour and limitations. Extracted from MSDN http://msdn.microsoft.com/en-us/library/ms132438(v=VS.80).aspx Be sure to choose your collection class carefully. Using the wro...

Use list to check for duplicates in a datarow

If you are walking through a dataset or datarow printing things out, you can skip duplicates by using a list to keep track of what you have done so far. var dupcheck = new List<string>(); foreach (DataRow dr in dt.Rows) { //rowIndex++; string partNumber = dr[1]+""; if(dupcheck.Contains(pa...

Captcha

I ran into a few problems with 'recaptcha' - i like it, but dont like how you need a site key for each one. Instead i decided to use MSCaptcha. Here is what I did: add this to web.config: <system.web> <httpHandlers> <add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.Capt...

Threading

Good discussion of threading, including a FireAndForget utility, using the thread pool, delegates and Beginxxx()/Endxxx() method pairs. http://www.yoda.arachsys.com/csharp/threads/threadpool.shtml HTTP GET with WebClient This seems to be the simplest way of doing HTTP GETs and also provides a sim...

Codelib Future

Links to possible things to implement in future Stongly typed web.config sections http://haacked.com/archive/2007/03/12/custom-configuration-sections-in-3-easy-steps.aspx An implementation of subforms: http://www.joncurtis.co.uk/ Capturing HTML response output to a string instead of sending d...

Csharp Date functions

private int GetAge(DateTime birthDate){ // cache the current time DateTime now = DateTime.Today; // today is fine, don't need the timestamp from now // get the difference in years int years = now.Year - birthDate.Year; // subtract another year if we're before the // birth day in the current year if...

VBS and ASP to CS converter

Sick of ASP? Got some VBS you need to use? Here is a basic converter to get you started: VBS / ASP to CS converter It could do with a bit more work, so email me if you need the source, and you're a regex freak.

Debugging

Set debug with PDB-Only mode in the web.config: <system.codedom> <compilers> <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" compilerOptions="/debug:pdbo...

Old style Custom Validators

Basic Validators <asp:RequiredFieldValidator ControlToValidate="Password" ErrorMessage="password is required" ValidationGroup="sign_up" Display="None" runat="server" /> Email Validator <asp:RegularExpressionValidator ValidationGroup="sign_up" ControlToValidate="Email" ValidationExpres...

Rounding

This may seem kind of obvious but in actual fact there are a couple of types of rounding, and there are lots of sites out there that explain it, but I'm going to keep it real simple here. Normal rounding: 3.4 -> 3 3.5 -> 4 3.6 -> 4 Round-to-even method (also known as unbiased rounding,...

Inversion of control

James Kovacs' roll-your-own IoC container Very good introduction to dependency injection and inversion of control http://www.dnrtv.com/default.aspx?showNum=126

Create, Insert, Update, Delete Raw (no ORM)

void test1() { string sConnectionString = "Password=StrongPassword;User ID=UserName;" + "Initial Catalog=pubs;"+ "Data Source=(local)"; sConnectionString = Beweb.BewebData.GetConnectionString(); var objConn = new SqlConnection(sConnectionString); objConn.Open(); var daAuthors = new SqlD...

Listview counter

Listview with a counter column: <asp:ListView ID="Top20Lv" DataSourceID="Top20Ds" runat="server"> <LayoutTemplate> <table cellspacing="0"> <tr> <th class="leftcol">#</th><th class="leftcol">People</th> </tr> <...