static void Main(string[] args)
{
// create a single object for the db app
StudentApp app = new StudentApp();
// read in data from the input file
app.ReadDataFromInputFile();
// operate the database - carry out the user's CRUD operations
app.RunDatabaseApp();
// write the data to the output file
app.WriteDataToOutputFile();
}
static void Main(string[] args)
{
//create a single instance of the db application
StudentApp app = new StudentApp();
//read in the data from the data file
app.ReadDataFromInputFile();
//Rrun the database app
app.RunDatabaseApp();
//write data to the output file
app.WriteDataToOutputFile();
}