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Spot the Bug! – The Key to using Anonymous Types (Jonathan Aneja)
16 November 09 11:54 PM
This one’s going to be long, but for those of you who’ve felt the first 3 in this series were too easy I promise this one’s tougher J . Let’s say you want to list all the customers from a table in a ComboBox, and update the UI based on which one is selected. Read More...
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Spot the Bug! – Is it in VB or XAML? (Jonathan Aneja)
12 November 09 07:39 PM
What’s wrong with the following WPF code? Class Window1 Sub OK_Click(sender As Object , e As RoutedEventArgs) Handles OK.Click MsgBox( "Button Clicked" ) End Sub End Class < Window x : Class ="Window1" xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Read More...
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Spot the Bug! – Much ado about Nothing… Part 2! (Jonathan Aneja)
05 November 09 11:46 PM
In yesterday’s post we saw that the use of the wrong comparison operator with Nothing in an If block can lead to surprising results. Let’s look at a slightly different case today: Dim x As Integer = Nothing If x = Nothing Then MsgBox( "A true statement Read More...
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Spot the Bug! – Much Ado about Nothing… (Jonathan Aneja)
03 November 09 06:32 PM
Microsoft has this neat mailing list called “Spot the Bug” where developers can send interesting snippets of code that look correct but actually have subtle bugs in them. The puzzles are a lot of fun and I’ve always thought it’d be a fun thing to try Read More...
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Dynamic Searching using LINQ - Dataset + Joins
10 July 09 05:22 PM
About two years ago I posted some code that shows how to dynamically construct LINQ queries at runtime . On average there's a couple questions per month about trying it in some edge case, and usually the support already exists within the API. Recently Read More...
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Attachment(s):DynamicQueries.zip
VB 2008 Language Deep Dive - Presentation Materials (Jonathan Aneja)
20 August 08 09:55 PM
Last week I got the chance to visit the Toronto .NET User Group and give a talk on all the great new language features in VB2008. It was great to see so much excitement a round LINQ and especially XML Literals ! The slides and demo code are posted at Read More...
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Attachment(s):VBLanguageDeepDive.zip
How LINQ to Dataset works in VB (Jonathan Aneja)
14 May 08 04:52 PM
LINQ at its core requires any data source to be queryable , which basically means it must implement IEnumerable. (It’s actually a bit more complicated than that, for a full explanation see section 11.21.2 of the Visual Basic 9.0 Language Specification Read More...
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Using LINQ to Dataset in an .aspx page (Jonathan Aneja)
13 May 08 06:35 PM
Recently I got a customer question about how to use LINQ to Dataset in an .aspx file. The compiler was complaining that it couldn't find the AsEnumerable method that allows LINQ to work over a DataTable ("AsEnumerable is not a member of 'DataTable'"). Read More...
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Launching External Tools from inside Visual Studio (Jonathan Aneja)
27 November 07 08:08 PM
Visual Studio has a small but extremely useful feature that allows you to hook external tools directly into the IDE’s Tools menu. All you have to do is click Tools->External Tools… and then you can add your own custom menu items that will launch a Read More...
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Option Strict [On|Off|SortOf]
25 September 07 03:29 PM
Yesterday I got a question from a developer asking whether or not we could add something called "Option Strict Warn" to the language. This would give a developer a warning when using something like late binding or an implicit conversion, rather than disabling Read More...
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Implementing Dynamic Searching Using LINQ
29 August 07 03:51 PM
A common requirement in forms-over-data applications is that users be able to search by any combination of fields to construct a dynamic query at run time. For example, the search feature in this application allows the user to find all records that meet Read More...
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Attachment(s):DynamicCondition.zip
LINQ Cookbook, Recipe 7: Selecting Pages of Data from Northwind (Jonathan Aneja)
12 July 07 10:58 AM
Ingredients: - Visual Studio 2008 (Beta2 or Higher) - Connection to Northwind database Categories: LINQ-To-Objects, LINQ-To-SQL Instructions: · Create a new Windows Forms project with a Northwind DataContext (for step-by-step instructions on how to do Read More...
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LINQ Cookbook, Recipe 3: Find all the prime numbers in a given range (Jonathan Aneja)
28 June 07 01:21 PM
Ingredients: - Visual Studio 2008 (Beta2 or Higher) Categories: LINQ-To-Objects Instructions: - Open Visual Studio 2008, and Click ‘File/New Project’. Find and double-click the ‘Console Application’ Icon - Add the following code: Module Module1 Sub Main() Read More...
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