ParameterDirection

ParameterDirection is an enumeration in the .NET Framework that specifies whether a parameter is an input, output, or both. It is used in conjunction with the DbCommand and DbParameter objects to define the behavior of parameters in database operations.

The enumeration has three members: Input, Output, and InputOutput. When a parameter is set to Input, its value is passed from the application to the database. If it is set to Output, its value is returned from the database to the application. InputOutput indicates that the parameter is used for both input and output.

This enumeration is fundamental for working with stored procedures and parameterized queries, allowing developers to control the flow of data between their applications and the database. For example, when calling a stored procedure that returns a value, the corresponding parameter would be set to Output or InputOutput. Similarly, when passing values to a stored procedure, the parameter would be set to Input or InputOutput. Understanding and correctly utilizing ParameterDirection ensures that data is exchanged as intended and that database operations function correctly. It is a key component of ADO.NET for managing database interactions.