Studio Express problem

[WDT]

Hi

I'm just starting to use the Visual C# Express 2008 IDE.
I have the Following code:

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

namespace WFATest
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {

        }
//===================================================
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
        
        }//================================================
commenting this part out in visual Studio express causes errors despite the fact they do nothing. Can someone explain to me why this is?

        
        private void passToB_Click(object sender, EventArgs e) //This is button A
        {
            textBox2.Text = textBox1.Text;
            textBox1.ResetText();
        }

        private void passToA_Click(object sender, EventArgs e) //This is button B 
        {
            textBox1.Text = textBox2.Text;
            textBox2.ResetText();            
        }
        
    }
}

Which I intend to use to teach someone programming. The problem is Button B works perfectly but clicking A does nothing.

[prog-bman]

Probably because those text fields have events hooked up to them. Look at the lightning bolt in the properties of the text fields and see if there are events hooked up.

[WDT]

Thanks. Button A had nothing assigned.

[vart]

Thanks. Button A had nothing assigned.

Why are you checking Button A while commenting out events for TextBo1 and TextBox2?

[WDT]

I actually don't comment them out when I build the project. If I do it throws up errors. I just had it commented out here to see if someone can explain why taking out the commented section throws up errors.

[WDT]

I came across this:

 if (GetRawInputDeviceList(pRawInputDeviceList, &nDevices, sizeof(RAWINPUTDEVICELIST)) == (<dtype rid="UINT"/>)-1) {Error();}

I'd like to know what the part underlined in bold does.
Also I'm still stuck with my original problem.

I'm now understanding a little more about how to get around my original problem.
It seems I need to PInvoke the DLL file in C# Whilst I've seen examples it fails to clarify a few things for me.

After using the [DllImport("User32.dll")]
a) Do I then need to define the structures of the types I need?
b) Do I need to define/declare the functions I need?
c) I have been reading through msdn. It says I need to wrap function in a class. so far I haven't seen an example of how I'd
use the class after wrapping it in a class.

Any help would be appreciated.

[theoobe]

[DllImport("user32.dll")]
public static extern uint GetRawInputDeviceList(IntPtr pRawInputDeviceList, ref uint nDevices, uint rawInputDeviceListSize);

[WDT]

Thanks theoobe but I already had that.

Still doesn't solve my problem.
I'd just like a document a a few words explaining the process of platform Invoking. I'll take it from there.
Any help in this would be greatly appreciated.