For more information, see Protecting Connection Information. If the event handler for the CellValidating event finds that the value is an empty string, the DataGridView prevents the user from exiting the cell until a non-empty string is entered. In this walkthrough, you will retrieve rows from the Customers table in the Northwind sample database and display them in a DataGridView control.
This code example uses a GetData method that returns a populated DataTable object. Using Windows Authentication also known as integrated security is a more secure way to control access to a database.
This causes the DataGridView control to prevent the cursor from leaving the cell. Important Storing sensitive information, such as a password, within the connection string can affect the security of your application. Using Windows Authentication, also known as integrated security, is a more secure way to control access to a database. Be sure that you set the connectionString variable to a value that is appropriate for your database.
The following code example provides basic initialization and includes a Main method. You can validate data by handling the CellValidating event, which is raised by the DataGridView when the current cell changes. When you type a non-empty string into the cell, the DataGridView control lets you exit the cell. If the cell value fails validation, set the Cancel property of the System. You will see a DataGridView filled with data from the Customers table.
The DataGridView class provides a convenient way to perform validation before data is committed to the data store. When the user edits a cell in the CompanyName column, its value is tested for validity by checking that it is not empty. The CellValidating event handler is where you determine whether the value of a cell in the CompanyName column is empty. References to the System, System. You can also build this example in Visual Studio by pasting the code into a new project.
In this example, the DataGridView is populated with rows from the Customers table of the Northwind sample database. Next Steps This application gives you a basic understanding of the DataGridView control's capabilities.
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