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C# - How to load text from text file in a listbox into a richTextBox?

Now solved. Thanks for your answers!
This is my code right now:
//Listbox scripts is the name of my folder
private void Form1_Load(object sender, EventArgs e)
{
foreach (var file in Directory.GetFiles(AppDomain.CurrentDomain.BaseDirectory + #"Listbox scripts"))
{
string file2 = file.Split('\\').Last();
listBox1.Items.Add(file2);
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
webBrowser1.Document.InvokeScript("SetText", new object[]
{
File.ReadAllText(string.Format("./Listbox scripts/{0}", listBox1.SelectedItem.ToString()))
});
}
I'm new to coding in C# and I have a textbox that has the names of text files in a directory and when I click on the text file in the listbox it's supposed to load the text from it into my textbox (named 'ScriptBox')
Here's my code:
private void Form1_Load(object sender, EventArgs e)
{
string User = System.Environment.MachineName;
textBox1.Text = "{CONSOLE} Welcome to Linst, " + User + "!";
directory = new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory + #"Scripts");
files = directory.GetFiles("*.txt");
foreach (FileInfo file in files)
{
listBox1.Items.Add(file.Name);
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
var selectedFile = files[listBox1.SelectedIndex];
ScriptBox.Text = File.ReadAllText(selectedFile.FullName); //these parts are the parts that dont work
}
Thanks in advance!

Add the below into your Form1.cs. What this is going to do is when a user clicks a listbox item, its going to call (raise an event) the "listBox1_MouseClick" method and set the text of the textbox to the text of the listbox item. I just quickly created an app and implemented the below and it works.
private void listBox1_MouseClick(object sender, MouseEventArgs e)
{
textBox1.Text = listBox1.Text;
}
And add the below to the Form1.Designer.cs where the rest of your list box properties are. The below is subscribing to an event, the listBox1_MouseClick method in Form1.cs, so when a user clicks on a listbox item, the listBox1_MouseClick method is going to run.
this.listBox1.MouseClick += new MouseEventHandler(this.listBox1_MouseClick);
I hope the above makes sense.

Your code is nice, and perfect but it just need a little validation check in list index selection
Try thing in your listbox_selectedIndexChanged
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (listBox1.SelectedIndex!=-1)
{
FileInfo selectedFile = files[listBox1.SelectedIndex];
ScriptBox.Text = File.ReadAllText(selectedFile.FullName);
}
}

I actually don't see a problem with your code, could it be a typo somewhere?
I did this and it worked for me:
private void Form1_Load(object sender, EventArgs e)
{
foreach (var file in System.IO.Directory.GetFiles(#"c:\"))
{
listBox1.Items.Add(file);
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (listBox1.SelectedItem != null)
{
textBox1.Text = System.IO.File.ReadAllText(listBox1.SelectedItem.ToString());
}
}

How to make Drag&Drop work?

I have a textbox on a winform in Visual Studio. I want to drag&drop files on it. This is what I have done:
public LangMerge()
{ InitializeComponent();
this.AllowDrop = true;
tbxFilepath.AllowDrop = true;
tbxFilepath.DragDrop += new DragEventHandler(tbxFilepath_DragDrop);
tbxFilepath.DragEnter += new DragEventHandler(tbxFilepath_DragEnter);
}
void tbxFilepath_DragDrop(object sender, DragEventArgs e)
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
foreach (string file in files) tbxFilepath.Text=(file);
}
void tbxFilepath_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.Copy;
}
Neither the drag effect nor the receiving of the file does not work. No error messages or warnings. What could be the problem?
UPDATE: I inserted breakpoints into the event handler methods and the code doesn't get into them in the first place, no matter what I do with the cursor.

You have set AllowDrop=true; and handled DragDrop() and DragEnter() events, however for winforms application you need to also handle TextBox.DragOver() event :
Something like this :
private void textBoxFile_DragOver(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}

How to drag & drop only one file on form window

I have one windows application in c#, i want to add drag & drop facility in this application, after adding this facility it takes multiple files, so I want to take only one file at a time, how to do this?

read the code below and try applying it to your situation
public Form1()
{
InitializeComponent();
this.AllowDrop = true;
this.DragEnter += Form1_DragEnter;
this.DragDrop += Form1_DragDrop;
}
void Form1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Copy;
}
void Form1_DragDrop(object sender, DragEventArgs e)
{
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
if (files.Length == 1)
{
// do what you want
}
else
{
// show error
}
}

C# drag and drop files to form

How could I load files to a form by drag-and-drop?
Which event will appear?
Which component should I use?
And how to determine name of file and others properties after drag-and-dropping it to a form?
Thank you!
Code
private void panel1_DragEnter(object sender, DragEventsArgs e){
if (e.Data.GetDataPresent(DataFormats.Text)){
e.Effect = DragDropEffects.Move;
MessageBox.Show(e.Data.GetData(DataFormats.Text).toString());
}
if (e.Data.GetDataPresent(DataFormats.FileDrop)){
}
}
ok, this works.
How about files? How can I get filename and extension?
and this is only a dragEnter action.

This code will loop through and print the full names (including extensions) of all the files dragged into your window:
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
foreach (string filePath in files)
{
Console.WriteLine(filePath);
}
}

Check the below link for more info
http://doitdotnet.wordpress.com/2011/12/18/drag-and-drop-files-into-winforms/
private void Form2_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string[] filePaths = (string[])(e.Data.GetData(DataFormats.FileDrop));
foreach (string fileLoc in filePaths)
// Code to read the contents of the text file
if (File.Exists(fileLoc))
using (TextReader tr = new StreamReader(fileLoc))
{
MessageBox.Show(tr.ReadToEnd());
}
}
}

You need work with 2 below Events, of course while your Control/Form AllowDrop property's is true.
private void Home_DragOver(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.Link;
else
e.Effect = DragDropEffects.None;
}
private void Home_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
//YourOpenMethod(files);
}
}
Enjoy...

How can I drag a folder from my Windows Explorer into a ListView and load the files into it?

I can't seem to make this work using this:
private void listView1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
e.Effect = DragDropEffects.Copy;
}
}
private void listView1_DragDrop(object sender, DragEventArgs e)
{
string[] directoryName = (string[])e.Data.GetData(DataFormats.FileDrop);
string[] files = Directory.GetFiles(directoryName[0]);
foreach (string file in files)
{
if (Path.GetExtension(file) == ".mp3")
{
listView1.Items.Add(file);
}
}
}
The mouse cursor shows a NOT sign and I can't drop the folder in my program.

Have you set the AllowDrop property of your ListView to True?
Is your DragEnter event ever being hit?