C#

BindingList<listItem> normalExtItems = new BindingList<listItem>();

//elements are added to the bindingList here

extItem = new listItem(Number,Name,Id));

if(normalExtItems.Contains(extItem))//always returns false
{
   //do sth
}

 private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            groupBox1.Show();<br />
            button2.Hide();<br />
            int count=0;<br />
            string oneline="";<br />
            if (!Directory.Exists(textBox1.Text)) Directory.CreateDirectory(textBox1.Text);<br />
<br />
            // I want my groupBox to remain while this process continues.<br />
            for (int i = 0; i < listBox1.Items.Count; i++)<br />
            {<br />
                oneline = listBox1.Items[i].ToString().ToLower();<br />
                if (oneline.EndsWith(".mts"))<br />
                {<br />
                    string infile = label1.Text+ oneline;<br />
                    string outfile = textBox1.Text + oneline;<br />
                    File.Copy(infile,outfile,true);<br />
                    label2.Text= "Exporting: " + infile;<br />
                    count++;<br />
                }<br />
            }<br />
<br />
            // I do not want the following to execute until the above has completed<br />
            label3.Text = count + " Files Copied ";<br />
            button2.Show();<br />
        }<br />
<br />
        private void button2_Click_1(object sender, EventArgs e)<br />
        {<br />
            groupBox1.Hide();<br />
        }

[Serializable]
public class Type1
{
    public int abc;
}

[Serializable]
public class Type2
{
    public int cba;
}

public class Program
{
    static void Main(string[] args)
    {
        Type1 input = new Type1();
        input.abc = 12345;
        Type2 output = new Type2();

        IFormatter formatter = new BinaryFormatter();
        Stream stream = new FileStream("output.bin", FileMode.Create, FileAccess.Write, FileShare.None);
        formatter.Serialize(stream, input);
        stream.Close();

        stream = new FileStream("output.bin", FileMode.Open, FileAccess.Read, FileShare.None);
        output = (Type2)formatter.Deserialize(stream);

        return;
    }
}