C#

private void btnLogon_Click(object sender, System.EventArgs e)<br />
		{<br />
			//If the page is not valid, tell the cleint<br />
<br />
			if (!Page.IsValid)<br />
			{<br />
				lblMsg.Text="Some required fields are invalid.";<br />
				return;<br />
			}<br />
			else<br />
			{<br />
				string cmd=txtBoxEmail.Text;<br />
<br />
				//Create a new instance of the DataSet class<br />
<br />
				DataSet ds= new DataSet();<br />
<br />
				//Read in the XML file containing user name and password combinations.<br />
<br />
				FileStream fs= new FileStream(Server.MapPath("Users.xml"),FileMode.Open,FileAccess.Read);<br />
				StreamReader reader= new StreamReader(fs);<br />
				ds.ReadXml(reader);<br />
				fs.Close();<br />
<br />
				//Create a new instance of a DataTable name users that is initialized to ds.<br />
			<br />
				DataTable users= ds.Tables[0];<br />
<br />
				//Check for any matches between the logon name and the list of name in Users.xml.<br />
				//For each match found, record the name in a DataRow names matches.<br />
<br />
				DataRow[] matches= users.Select(cmd);

[DllImport("wininet.dll", CharSet=CharSet.Auto, SetLastError=true)]
static extern bool InternetGetCookie(string url, string name, [Out] string data,
  ref int size);

public string GetCookie(string url, string name)
{
  int size = 0;
  string data = null;
  // Get the size for 'data' first.
  if (!InternetGetCookie(url, name, null, ref size))
  {
    if (Marshal.GetLastWin32Error() == 122) // ERROR_INSUFFICIENT_BUFFER
    {
      data = new string('\0', size);
      if (InternetGetCookie(url, name, data, ref size))
        return data.Trim();
    }
  }
  return null;
}