Updating dataset using datagrid

02-Feb-2015 04:50 by 10 Comments

Updating dataset using datagrid - interntional dating site for serious relations

For details about the relationship between datasets and schemas, see Introduction to Data Access with ADO. To generate a dataset At this point you have set up everything you need in order to get information out of database and into a dataset.In this walkthrough, you will add a single control — a Data Grid control — that can display all the records from the dataset at the same time and allows you to add the ability to edit records.

Page You need to add an update command string upd = @"update employee set firstname = @firstname where id = @id"; Sql Command cmd = new Sql Command(upd, cn); da.

To begin, you create a data adapter that contains the SQL statement used to populate the dataset later.

As part of this process, you define a connection to access a database.

If the dataset includes constraints, you can temporarily turn constraints off before making any updates, and then turn them back on afterward.

For more information, see Suspending Update Constraints.

The architecture of Web Forms data binding makes it easy to display data in page controls.

However, data binding is not two-way — that is, data binding reads data from a data source but does not update it.

For more information, see Web Data Access Strategy Recommendations. Instead, you will perform the following set of steps: It is important that you follow all the procedures in this section.

Otherwise your page will not have the dataset that you will be using in subsequent parts of the walkthrough.

Updating is more complex than displaying data, and because the majority of Web Forms pages do not require that data be written back to the source, Web Forms data binding keeps page sizes and page processing to a minimum by not including update code.

Of course, there are times when you do want to create a Web Forms page that updates data. It shows how you can use a Data Grid control to display data, allow users to edit it, and then send the changed data back to the source.

Note In Windows Forms, the data-binding architecture takes care of sending changes from data-bound controls to the dataset, and you do not have to explicitly update the dataset with your own code.