5 replies to this topic

[sangalaki]

Hello

Hope someone can help me with this.
I've been practising to build a basic windows app from O'reilly HeadFirst C# book and Im stuck. I have exactly the same code as the book wrote but I can't compile it due to error with words that has got red curly underline (Words underline below). These words does not exist in current context, how can I remove this? and where did I do wrong?

Here is the code;

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Navigatorchapter3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void textBox1_TextChanged(object sender, EventArgs e)
{
string destination = textBox1.Text;
string route2StreetToAvoid = textBox2.Text;
string route3StreettoInclude = textBox3.Text;

Navigator navigator1 = new Navigator();
navigator1.SetDestination(destination);
int distance1 = navigator1.TotalDistance();
}

private void textBox2_TextChanged(object sender, EventArgs e)
{
Navigator navigator2 = new navigator();
navigator2.SetDestination(destination);
navigator2.ModifyToAvoid(route2StreetToAvoid);
int distance2 = navigator2.TotalDistance();
}

private void textBox3_TextChanged(object sender, EventArgs e)
{
Navigator navigator3 = new navigator();
navigator3.SetDestination(destination);
navigator3.ModifyRouteToInclude();
int distance3 = navigator3.TotalDistance(route3StreetToInclude);

int shortestDistance = Math.Min(distance1, Math.Min(distance2, distance3));
}
}
}


Thanks in advance

Wahyu

[Davide]

Check out if O'Reilly's code has any using statement that you don't have. Do you have a class named Navigator in your project? If not, that's why it is underlined.

[Davide]

Also, you declared a distance1 in an event, but you are using it in another, you can't do that.

private void stuff()
{
int myVariable = 5;
}

private void anotherStuff()
{
int result = myVariable + 2; //You CAN'T do this, myVariable has to be declared inside the same event, or outside
}
int myVariable; //Like this

[gokuajmes]

i always advice members to post your code in the code tags.Read below to know how,

1.First you Paste some code.

2.Then highlight the code with your mouse.

3.In the HTML editor click the # button.

that's it.

[sangalaki]

Hi Davide,

I wrote this code according to the book, can you show me where I got it wrong in the code please? Thanks

[Davide]

Hello sangalaki,
there must be something that you are missing there, it could be here:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

Or, you forgot to add a class named "Navigator.cs" to your project.

Also, try to read further through the book, maybe you have to add that class right after writing this code. Keep on reading, if the book tells you to compile and you still got the curly underlines, there must be some other mistake.