NET Framework 3.5 release, and which enables you to easily model relational databases using . You can use LINQ expressions to query the database with them, as well as update/insert/delete data.
We just need to create a new object of corresponding database table type, then add it to the Data Context object and then commit the changes. If you want to insert more than one row, then you will have to create a ‘List’ array object containing all the ‘User’ objects and then use ‘Insert All On Submit‘ method, it will work fine.
Here is a small block of c# code samples to create new ‘User’ linq to sql class(Representing ‘Users’ Table in Database) and add it to ‘Users Data Context’ class(Represents the database) and commit the changes to original database by ‘Submit Changes'(without this, no changes will be reflected to database): For your information, the above code example is for . If you are using an earlier version, you will have to use ‘Add‘ method instead of ‘Insert On Submit‘ . Deleting data/row from database using linq is as simple as inserting data and this is also sql syntax free operation 🙂 .
So, here it’s automatically reflecting when we made change in the ‘n USer’ Object.
However, the following code won’t work: This won’t work because it causes the n User object to point another memory location reference and that memory location isn’t tracked by Data Context object.
Initially, the update was set when the information was passed to the window to get the information inthe fields.
If the table object was null, the I set the Update flag to false.Recently, I have discussed about getting started linq to sql in c#That articles also covered for creating select query for retrieving both single and multiple results.The accept button will have code to direct the appropriate call like this: The Database Commands methods are located in my cs file as this is a good place to put my general code (personal preference). If there is an SQL error of some sort, the program will open a messagebox and explain the error.You could just have easily created a new folder in the project and put the classes there. The exception may be caused be an illegal constraint.Thus, no changes will be reflected to your database.