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Validating data in datagridview, creating the Form

References to the System, System. You will see a DataGridView filled with data from the Customers table. You can also build this example in Visual Studio by pasting the code into a new project. For more information, see Protecting Connection Information. When the user edits a cell in the CompanyName column, its value is tested for validity by checking that it is not empty.

To test the form Compile and run the application. Using Windows Authentication, also known as integrated security, is a more secure way to control access to a database.

If the cell value fails validation, set the Cancel property of the System. The following code example provides basic initialization and includes a Main method.

Validating data in DataGridView

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In this walkthrough, you will retrieve rows from the Customers table in the Northwind sample database and display them in a DataGridView control. Be sure that you set the connectionString variable to a value that is appropriate for your database. Important Storing sensitive information, such as a password, within the connection string can affect the security of your application.

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The CellValidating event handler is where you determine whether the value of a cell in the CompanyName column is empty. 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. You can validate data by handling the CellValidating event, which is raised by the DataGridView when the current cell changes. In this example, jordana nail polish uk dating 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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Compiling the Code

Using Windows Authentication also known as integrated security is a more secure way to control access to a database. This code example uses a GetData method that returns a populated DataTable object. This causes the DataGridView control to prevent the cursor from leaving the cell. The DataGridView class provides a convenient way to perform validation before data is committed to the data store. When you type a non-empty string into the cell, the DataGridView control lets you exit the cell.

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Creating the Form

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