try
{
    using (SqlConnection con = new SqlConnection(connstring2))
    {
        con.Open();
        using (SqlCommand command = new SqlCommand("DELETE FROM Customer WHERE Id = '" + item + "'", con))
        {
            command.ExecuteNonQuery();
            using (StreamWriter sw = File.AppendText(Application.StartupPath + @"PurgeSucceed.Log"))
            {
                sw.WriteLine(CustomerIdentifier + " was deleted");
            }
        }
        con.Close();
    }
}
catch (Exception ex)
{
    using (StreamWriter sw = File.AppendText(Application.StartupPath + @"PurgeFail.Log"))
    {
        sw.WriteLine(CustomerIdentifier + "  has a relationship somewhere in the database.");
    }
}