Updating records using linq
The panel1 is not visible when the form firstly loads. It is visible when the user clicks the add button to add a row or when the user double clicks a row to update its data. Before you can work with the table of the database, you need to create a class to map to the table. You will learn how to read data from a SQL Server database and place them in a List View control, add, update, and delete rows from a Window Form. Then create a Windows Form Application in Visual Studio C# 2010 Express. The add Record will be called when the user clicks the add new button.
First we will look at a complicated , adding a new customer to the Adventure Works database.
The List View (list View1) is used to display records from the Institution table. Current Directory "/images/saveicon.png"); btdelete. The delete Record is called when the delete button is pushed.
Above the List View, there are two buttons, delete and add new buttons. Check Boxes = true; //Connect to SQL Server database db = new Data Context("Server=ASPIREV5\SQLEXPRESS; Initial Catalog=testdb; Integrated Security=SSPI"); //add images to buttons (save, delete, and add new buttons) btsave. It will delete all checked rows from the List View as well as from the database.
Note: This is not a very good example from the standpoint of keeping the Adventure Works database clean and correct, we are only interested in meeting each of the SQL Constraints, not the business logic. Creating a new record keeps with the mind set of working with objects, so you simply create a new object of the appropriate record type and set its properties.
will wrap up all of the changes you have made to the database and submit them as a single transaction, this is good news because if any of them changes fail, they all fail. When linking two records together, you have two choices, both of which I have given an example of.