C#

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
    // The data that needs to be sent
    byte[] data = new byte[122];

    // Fill the data here

    // Send the data
    socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
    socket.SendTo(data, new IPEndPoint(IPAddress.Broadcast, port));

    // Wait for responses
    for (int i = 0; i < 100; i++)
    {
        int availableBytes = socket.Available;
        if (availableBytes > 0)
        {
            byte[] buffer = new byte[availableBytes];
            socket.Receive(buffer, 0, availableBytes, SocketFlags.None);

            // Interpret the buffer
            
            // Finally, return the response
            return ASCIIEncoding.ASCII.GetString(buffer);
        }

        System.Threading.Thread.Sleep(100);
    }
    return "Nothing found";
}
finally
{
    socket.Close();
}

using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            treeView1.AllowDrop = true;
        }

        private void treeView1_DragDrop(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
                foreach (string file in files)
                {
                    // Do whatever you need here. file contains full path to folder or file
                }
            }
        }

        private void treeView1_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.None;
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effect = DragDropEffects.Copy;
        }
    }
}

Ashfield wrote:

It trims the null(s) off the end of string1.

char[] trim = { 'o', 'a' };
textBox1.Text = "Hellooooo".TrimEnd(trim[0]);

textBox1.Text = "Hellooooo       ".TrimEnd(new char[0]);