help C# (split # bi nahayat)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Diagnostics;
using System.Windows.Forms;
using System.Linq;
using System.Xml.Linq;
using System.Net.Sockets;
using System.Text;
using System.Collections.ObjectModel;
namespace WindowsApplication1
{
public partial class Form1
{
internal Form1()
{
InitializeComponent();
}
private Collection collect = new Collection();
private string[] a;
private void Button1_Click(object sender, System.EventArgs e)
{
try
{
a = TextBox1.Text.Split('#');
Label1.Text = "count of ids: " + a.GetUpperBound(0).ToString();
for (var i = a.GetLowerBound(0); i <= a.GetUpperBound(0); i++)
{
System.Net.Sockets.Socket soket = new System.Net.Sockets.Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
collect.Add(soket);
collect[i] = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
collect[i].Connect("o.nimbuzz.com", 5222);
collect[i].Send(Encoding.UTF8.GetBytes(""));
collect[i].Send(Encoding.UTF8.GetBytes("" + a[i] + "" + TextBox2.Text + "" + TextBox3.Text + ""));
collect[i].Send(Encoding.UTF8.GetBytes("freebuzzzzzzzzzzzz"));
}
}
catch (Exception ex)
{
}

}
}

}