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Tuesday, July 14, 2009

Master-Detail Data Binding in WPF with Entity Framework

by Beth Massi via Beth Massi on 7/14/2009 11:24:06 PM

Today I thought I would talk about a really common scenario in data applications, creating a master-details (one-to-many) data entry form. I’ve written about WPF data binding and Entity Framework a lot in the past: Posts: Master-Details with Entity Framework Explicit Load Loading Data and Binding Controls in WPF with CollectionViewSource Using the WPF ObservableCollection with EF Entities Data Binding WPF Lookup Combobox Values to EF Entities Notifying the UI when Entit ... [ read more ] 8 comment(s)

Debugging: Heisenbug

by Deborah Kurata via Deborah Kurata on 7/14/2009 10:32:50 PM

Being a physics major in college, I am familiar with the Heisenberg Uncertainty Principle which basically states that in quantum physics, some properties (like position and momentum) cannot both be known to any precision. Though not technically accurate, the Heisenberg Uncertainty Principle is often simplified to what is called the observer effect . This refers to the fact that the act of observing something can change its behavior. This is very often true in programming, especially wh ... [ read more ] 1 comment(s)

Hyperlinks with Images and WPF Pages

by CanOz via VB & .NET Blogs @ vbCity.com on 7/14/2009 10:31:00 PM

Continuing on the subject, and project, from my last post I will look at using an Image, as well as other WPF Elements, instead of plain boring Text as the visual for a Hyperlink on a WPF Page. The page in question will be viewed by the user in the web browser, in the instance of my application the browser will be IE6, which will link to external sites on the Internet. We wanted to use the logo from the sites, sometimes with a caption under the logo, rather than just a textual lin ... [ read more ]

Dates: Binding to Day Numbers

by Deborah Kurata via Deborah Kurata on 7/14/2009 9:07:07 PM

My prior post demonstrated how to bind to a list of month names. Once the user picks the desired month, you may want to provide a list of valid dates to pick a date in that month. For example: 1-30 for September and 1-31 for July. You can accomplish this using a switch statement (Select Case in VB), but that hard-codes the dates, does not handle leap year, and does not support localization. Another option is to use the culture specific calendar as shown below. The code is first shown ... [ read more ]

Dates: Binding to Month Names

by Deborah Kurata via Deborah Kurata on 7/14/2009 8:14:38 PM

Visual Studio comes with DateTimePicker and MonthCalendar controls that provide a standard looking calendar for the user to pick a date. But there are times when these controls don’t provide the features you need. For example, say you want to ask the user for the month and year that their credit card expires. Or you want to ask for a birth date and don’t want the user to have to scroll back to 1932. Or better yet, don’t need to know the year (not that I refuse to admit my birth year <G> ... [ read more ] 1 comment(s)

Hyperlinks and WPF Pages

by CanOz via VB & .NET Blogs @ vbCity.com on 7/14/2009 5:44:00 AM

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