Button MyButton; // Field
.
.
.
MyButton = new Button ();
MyButton.Location = new Point (16, 16);
MyButton.Size = new Size (96, 24);
MyButton.Text = "Click Me";
Controls.Add (MyButton); 
MyButton.Click += new EventHandler (OnButtonClicked);
.
.
.
void OnButtonClicked (Object sender, EventArgs e)
{
// TODO: Respond to the button click
}
ControlDemo Example
using System;
using System.Windows.Forms;
using System.Drawing;
using System.IO;
class MyForm : Form
{
Label PathNameLabel; // four controls on this form
TextBox PathNameBox;
ListBox FileNameBox;
Button ShowFileNamesButton;
string CurrentPath;
MyForm ()
{
// Set the form's title
Text = "Control Demo";
// Set the form's size
ClientSize = new Size (256, 248);
// Create the form's controls
PathNameLabel = new Label ();
PathNameLabel.Location = new Point (16, 16);
PathNameLabel.Size = new Size (224, 16);
PathNameLabel.Text = "Path name";
PathNameBox = new TextBox ();
PathNameBox.Location = new Point (16, 32);
PathNameBox.Size = new Size (224, 24);
PathNameBox.TabIndex = 1;
FileNameBox = new ListBox ();
FileNameBox.Location = new Point (16, 72);
FileNameBox.Size = new Size (224, 128);
FileNameBox.TabIndex = 2;
FileNameBox.DoubleClick += new EventHandler (OnShowFileInfo);
ShowFileNamesButton = new Button ();
ShowFileNamesButton.Location = new Point (112, 208);
ShowFileNamesButton.Size = new Size (128, 24);
ShowFileNamesButton.Text = "Show File Names";
ShowFileNamesButton.TabIndex = 3;
ShowFileNamesButton.Click +=
new EventHandler (OnShowFileNames);
// Add the controls to the form
Controls.Add (PathNameLabel);
Controls.Add (PathNameBox);
Controls.Add (ShowFileNamesButton);
Controls.Add (FileNameBox);
}
// Handler for the Show File Names button
void OnShowFileNames (object sender, EventArgs e)
{
// Extract the path name from the TextBox control
string path = PathNameBox.Text;
if (path.Length > 0) {
// Make sure the path name is valid
if (Directory.Exists (path)) {
// Empty the list box
FileNameBox.Items.Clear ();
// Get a list of all the files in the directory
string[] files = Directory.GetFiles (path);
// Put the file names (minus path names) in the
// list box
foreach (string file in files) {
FileAttributes attr = File.GetAttributes (file);
if ((attr & FileAttributes.Hidden) == 0)
FileNameBox.Items.Add (Path.GetFileName (file));
}
// Save the path name in case the user double-
// clicks a file name
CurrentPath = Path.GetFullPath (PathNameBox.Text);
}
// If the path isn't valid, notify the user
else
MessageBox.Show (path + " is not a valid path",
"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
// Handler for DoubleClick events from the ListBox
void OnShowFileInfo (object sender, EventArgs e)
{
// Create a fully qualified file name from the file name
// that the user double-clicked
string file = CurrentPath;
if (!file.EndsWith (":") && !file.EndsWith ("\\"))
file += "\\";
file += FileNameBox.SelectedItem.ToString ();
// Display the dates and times that the file was created
// and last modified
DateTime created = File.GetCreationTime (file);
DateTime modified = File.GetLastWriteTime (file);
string msg = "Created: " + created.ToLongDateString () +
" at " + created.ToLongTimeString () + "\n" +
"Modified: " + modified.ToLongDateString () +
" at " + modified.ToLongTimeString ();
MessageBox.Show (msg, FileNameBox.SelectedItem.ToString (),
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
static void Main ()
{
Application.Run (new MyForm ());
}
}
