The Situation: You have a List<string> and need to convert it to a comma-delimited list (for display or storage). A Solution: This is a great example of how C# has improved over the years. I found this solution in this StackOverflow discussion and don't want to lose it, so I am copying it here for … Continue reading How to Convert a Generic List to a Comma-Delimited List
Author: Jim McMullen
How to Add a New Table to an Existing Database via EF Code-First Migrations
The Situation: You have been using Entity Framework code-first migrations with an existing database. Making changes to an existing table, such as adding a new field, go smoothly, and the database is updated correctly when you run an "Update-database" command. However, when you create an entirely new entity in your model and run "Update-database", the … Continue reading How to Add a New Table to an Existing Database via EF Code-First Migrations
How to Enable and Use EF Code-First Migrations for Multiple Contexts
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
How To Make a Column in an ASPxGridView ReadOnly for Editing but Enabled when Inserting a New Record
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
Entity Framework: Repository or Not Repository?
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?
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