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In addition to the security and performance benefits, parameterized commands provide a convenient method for organizing values passed to a data source.

A Db Parameter object can be created by using its constructor, or by adding it to the Db Parameter Collection by calling the method will take as input either constructor arguments or an existing parameter object, depending on the data provider.

This topic walks through several examples that explain the programming model.

The following table shows the The syntax for parameter placeholders depends on the data source. NET Framework data providers handle naming and specifying parameters and parameter placeholders differently. So, if the user enters ‘01234’ we should see an error message that would instruct the user about what type of data is valid for this field.To start, we create a text field and bring up the properties dialog for the field.Unlike command text, parameter input is treated as a literal value, not as executable code. This helps guard against "SQL injection" attacks, in which an attacker inserts a command that compromises security on the server into an SQL statement.

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