How to close database connection in windows service

private void BackupSqlServerDB(string BackupPath, string DBName, string DBCon)
 {

     SqlConnection Con = new SqlConnection();
     try
     {
         System.DateTime TheTime = DateTime.Now;

         string fileName = DBName + ".bak";
         BackupPath = Path.Combine(BackupPath, fileName);
         if (System.IO.File.Exists(BackupPath))
             System.IO.File.Delete(BackupPath);
         if (System.IO.File.Exists(BackupPath + ".zip"))
             System.IO.File.Delete(BackupPath + ".zip");
         Con.ConnectionString = DBCon;
         Con.Open();
         SqlCommand Cmd = new SqlCommand();
         Cmd.Connection = Con;
         Cmd.CommandText = "BACKUP DATABASE " + DBName + " TO DISK ='" + BackupPath + "';";
         Cmd.CommandTimeout = 360;
         Cmd.ExecuteNonQuery();
         Cmd.Dispose();
         Con.Close();
         Con.Dispose();
         GC.Collect();


     }
     catch (Exception ex)
     {

         AddLog(ex.Message, "Preparing Sql Backup", true);
     }
     finally
     {
         Con.Close();
         Con.Dispose();
         GC.Collect();
     }
 }