The Situation You want to use Entity Frameworks code-first migrations to push model changes to the database, but you have multiple databases and contexts in your model. When you try to run Enable-Migrations for the second context, you get an error that looks like this: Migrations have already been enabled in project 'Project1'. To overwrite the … Continue reading How to Enable and Use EF Code-First Migrations for Multiple Contexts
The Situation: You have a DevExpress ASPxGridView on your page with a column designated as "ReadOnly=true". This works great when you are editing an existing record -- it won't allow you to change that field, but when you try to insert a NEW record, you can't enter anything in the field. Note: I don't know … Continue reading How To Make a Column in an ASPxGridView ReadOnly for Editing but Enabled when Inserting a New Record
On the heels of the demise of the commercial version of EntitySpaces, I am delving into Microsoft's Entity Framework. I need to implement it in a big project to replace a much more manual Data Access Layer. So I've done a ton of reading on it (and played with it some, too), and the common … Continue reading Entity Framework: Repository or Not Repository?
The Situation You are trying to find out if an object exists in a List object. A Solution Use Linq. The example below looks for a User object in a List<User> by searching for the UserName:
The Situation: You have set up your CascadingDropDowns as shown on the ASP.NET AJAX Control Toolkit documentation here, using a web service to retrieve and populate your dropdowns. However, in addition to the value of the first dropdown, you need to pass other parameters to the web service to be used in your query. A … Continue reading How to Pass Extra Parameters When Using AJAX Toolkit CascadingDropDowns with a Database
I've done some more thinking about whether or not to use 3rd-party controls (see my original post, and this follow up) and I believe I have some "rules of thumb" that make sense now. My re-evaluation of my position on this has come because the EntitySpaces team announced that they would no longer continue the … Continue reading Should You Use 3rd-Party Controls and Frameworks? – Final Word?
The Situation: You need to to use a control that is not fully compatible with the latest version of Internet Explorer (or you find that your page just doesn't function the same in the latest version). A Solution: The normal solution (and the one that nearly everyone can use UNLESS they are working with ASP.NET … Continue reading How to Force an ASP.NET Page into IE Compatibility Mode (Even when Using Themes)
The Situation: You have an ASP.NET page that uses an ObjectDataSource to provide data access for a GridView, FormView or list control like a DropDownList or CheckboxList. When a data access error occurs, you would like to display a message on the page to help users understand what is happening. A Solution: You could try … Continue reading How to Catch Errors when Using ObjectDataSource
The very next day after I wrote my original post on using 3rd-party controls, the EntitySpaces team announced that they would no longer continue the framework and would make it open source by the end of 2012. Yikes! Now what? I have 2 choices - do nothing with my existing code and continue to use … Continue reading Should You Use 3rd-Party Controls and Frameworks? – Follow-Up
When you first start programming in a language, be it .NET, PHP, JAVA, or whatever, you tend to stick with the built in functions and controls. This makes sense, because you are learning how it works, what its strengths are, and where its limitations will trip you up. But every programmer at some point will … Continue reading Should You Use 3rd-Party Controls and Frameworks?