In C#, the ExecuteNonQuery method is used to execute a command that does not return any result set, such as an INSERT, UPDATE, DELETE statement. The return value of the ExecuteNonQuery method indicates the number of rows affected by the query.
If the ExecuteNonQuery method successfully executes the command, it returns an integer value representing the number of rows affected by the query. This value can be used to determine the success of the query execution and the impact it had on the database.
If the ExecuteNonQuery method encounters an error while executing the command, it will throw an exception. In this case, the return value will be -1 to indicate that an error occurred.
Overall, the return value of ExecuteNonQuery can be used to determine the success or failure of the query execution, as well as the number of rows affected by the query.