passing parameters via function

I'm making a C# airlines reservation project, taking the user details via form1, say I have a class Passen开发者_StackOverflowgerDetails with class variables. Now, on click of the button, I need to assign all those TextBox values to the class variables

private void btnSubmit_Click(object sender, EventArgs e)
{
    string fn = txtFname.Text;
    string ln = txtLname.Text;
    string add = txtAddress.Text;
    int age =   int.Parse(txtAge.Text);
    submit(fn, ln, add, age);
}

I need to pass these to the function. How should I declare it?

Create a class for passenger data and pass this as a parameter.

class Passenger
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Address { get; set; }
    public int Age { get; set; }
}

private void AddButton_Click(object sender, EventArgs e)
{
    var passenger = new Passenger
                        {
                            FirstName = txtFname.Text,
                            LastName = txtLname.Text,
                            Address = txtAdd.Text,
                            Age = int.Parse(txtAge.Text)
                        };
    AddPassenger(passenger);
}

Can't you just make a simple assignment?

public class MyClass
{
  public string fn;
  public string ln;
 public string add;
  public int age;
}

the submit function is

submit(string fn, string ln, string add, int age)
{
  MyClass myclass = new MyClass();
  myclass.fn = fn;
  myclass.ln = ln;
  myclass.add=add;
  mycalss.age = age;
}

You would have a form-level variable that stores an instance of your passenger details class can call that:

Note: pseudo code! Do not copy and paste!

class form1()
{
    private passenger_details = new PassengerDetail()

    private void button_click()
    {
        passenger_details.age = int(nameField.Text);
    }
}

You could also overload your constructor:

class Passenger
{
     public string FirstName { get; set; }
     public string LastName { get; set; }
     public string Address { get; set; }
     public int Age { get; set; }

     void Passenger() {}

     void Passenger(string _firstName, string _lastName, string _address, int _age) 
     {
          this.FirstName = _firstName;
          this.LastName = _lastName;
          this.Address = _address;
          this.Age = _age; 
     }
}

Then your event would just assign them at creation. (following code assumes you have a global variable called MyPassenger)

private void btnSubmit_Click(object sender, EventArgs e)  
{  
    this.MyPassenger = new Passenger(txtFname.Text, txtLname.Text, txtAddress.Text, int.Parse(txtAge.Text));     

}