Creating text file.

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C#

I need urgently help from you guys. i wanted to create textfile in my c drive. ive search for the code and implemented but unsuccessful inserting the value. The value that i want to insert before its will be removes from my listbox.and every 2 second and after containing 6 data in it, the textfile need to be refresh. here my code:

if (listBox1.Items.Count >= 7)
{
string path = @"C:\data.txt";
StreamWriter sw = new StreamWriter(path);

Thread.Sleep(200);
for (int i = 0; i < listBox1.Items.Count; i++)
{
sw.WriteLine(m_strTagUID);
listBox1.Items.RemoveAt(0);
}
sw.Close();
sw.Dispose();

}