some computer ado.net handcount increasing

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 .net framework 4.8 
 win10
 Not all computers behave this way; it's just some computers.
The system has updated all patches

var conStr=.......;

var scb = new SqlConnectionStringBuilder(conStr);
scb.ApplicationName = "DscServerD";
scb.Pooling = false;
// scb.MinPoolSize = 5;
// scb.MaxPoolSize = 100;
// scb.LoadBalanceTimeout = 5;
conStr = scb.ConnectionString;
Console.WriteLine(conStr);
Console.WriteLine("start debug\r\n");
string sql = "SELECT sort_no AS id,sort_name AS name,leag_flag AS remark FROM leag_sort where ltrim(sort_no)<>'' order by sort_no ";
while (true)
{
Thread.Sleep(5000); //主进程1秒1次

    try
    {
        using(SqlConnection conn=new SqlConnection(conStr))
         {
             using(SqlDataAdapter sda=new SqlDataAdapter(sql, conn))
             {
                 using (DataTable dt = new DataTable())
                 {
                     sda.Fill(dt);
                    //HandleCount will increasing 3
                     Console.WriteLine(string.Format("hand:{0}; query count {1}", Process.GetCurrentProcess().HandleCount, dt.Rows.Count));
                 }
             
             }
           
         }
      
    }
    catch (Exception ex)
    {
        Console.WriteLine(string.Format("hand:{0};  debug:{1}", Process.GetCurrentProcess().HandleCount, ex.Message));

    }

}

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8 hours hand 27000