Drag and Drop error

Questions & Answers
1

OK, I am doing a C# script about dragging objects from the files to a box(drag and drop files), but the problem is that when I copy this script and save it I get 2 erros saying me:

Assets/Standard Assets/File.cs(5,47): error CS0246: The type or namespace name `DragEventArgs' could not be found. Are you missing a using directive or an assembly reference?

So I don't know what exactly is saying(I dont know what is the error) so I decide to investigate and I found I have to put System.Windows.Forms;(but I am not sure if is that) but I save it and gives me an error that that word dosent exist. Here is the script I copy:

using UnityEngine;
using System.Collections;
using System;
public class File : MonoBehaviour {
private void textBox1_DragEnter(object sender,DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
        e.Effect = DragDropEffects.Copy;
}

private void textBox1_DragDrop(object sender,DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        var objPaths = (string[])(e.Data.GetData(DataFormats.FileDrop));
        if (objPaths != null && objPaths.Length > 0 && File.Exists(objPaths[0]))
        {
            MessageBox.Show(string.Format("Filename: {0}", objPaths[0]));
            using (TextReader tr = new StreamReader(objPaths[0]))
                textBox1.Text = tr.ReadToEnd();
        }
    }
}
}

So please could some one point me in the right direction of I need to do to solve this problem.

Thanks.. In advance.

2

I'm not certain, but you may need to have

using UnityEditor;
3

That does not really look like Unity code. A google search for DragEventArgs turned up this: http://msdn.microsoft.com/en-us/library/system.windows.forms.drageventargs.aspx?PHPSESSID=ev0v34i8u80gkmn37sd8r65363

That seems to indicate that the class is in the System.Windows.Forms namespace.