In the preceding code, I created a data Grid View1_Row Header Mouse Click Event for updating and deleting the selected record.When the user clicks on the Row Header of a row then the data present in the cell of the row is stored into the Text Boxes.Also note that your relations form the database are displayed with the correct parent/child (PK/FK) relation.
I’ll write some details on this later – but the basic principle is that if you have a nullable foreign key – i.e. There are ORM tools out there like Entity Spaces, Iron Speed and many more who will build the whole database in code for you, many-to-many relations and all – however, while it’s nice to auto-generate a complete datalayer with two clicks and a cup of coffee, you can also very easily begin to feel that you don’t really know 100% of what is actually a good thing!
you are not sure if you have matches at the end of your table relation and you would normally do a SQL LEFT JOIN, what you need to do in Linq is use the into clause to declare a collection for the results of your join – the reason being that you can then use the Default If Empty() method in a subsequent from clause to return empty objects where there is no match. Id into another Temp Result from tr in temp Result. Deleted == null select new And a more extensive example: /// /// Person Grid Helper. If you don’t know how it works, no-one knows how it works.
Now you can ask questions directly to me on my new site ASPForums.
Net Question Answer site, specially started to allow visitors of this site ask their doubts and queries. Just click the Ask Now button and ask your question now.
Default If Empty() //Left join, records from jobtitles collection, if missing default constructor is called from language in languages.
Note that you have description of the SQL datatype, the matching CLR type, you have null indication, primary key, update checks (check your Timestamp columns!
Here is a simple example: Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
Had some fun with this – rubbish formatting below – but paste into Visual Studio and autoformat it (ctrl e d). In many ways having the 1-to-1 limitation can be seen as a good thing.
Couple of examples below – first creates a anonymous object on the fly – here you have to null check to set values. Default If Empty() from atr in another Temp Result. /// /// /// Linq joins would normally create an anonymous type /// – however we cannot use anon types as the grid collection is passed to another method when searching (Load Person For Search). In contrast to this, Linq to SQL strikes a healthy balance between the convenience of generating classes and a data context (which is easy to query and understand) and leaving the implementation of more advanced features (like retrieving and updating related data) and the core business logic for the developer to implement. Once you have your O/R Designer window open, get the Server Explorer window up and drill into you database and pick two or three good tables to play around with.