使用try-catch代替if语句

Question

Currently learning c#. Is there any way I could use a try-catch block on the code below instead of an if statement to validate user input?

string carID = txtCar.Text;
if (carID != "")
{
    car1.car = carID;
}
else
{
    MessageBox.Show("Please enter a car id e.g: ford");
}

Answer 1

For this case use string.IsNullorEmpty

string carID = txtCar.Text;
if (!string.IsNullorEmpty(carID))
{
    car1.car = carID;
}
else
{
    MessageBox.Show("Please enter a car id e.g: ford");
}

Try and catch statements will slow your program so it is best to use them when necessary. A good example of when to use a try and catch is connecting to a database, also a good time to use throw with it. This is because the network could be down and a possible error could occur.