MySQL connection failed: 'Fatal error encountered during command execution.'

First of all, when I try to read data from my mysql database on my windows server 2016 vds server to my desktop applications(c#), I often encounter this error. I couldn't handle it.

***Error details:*** 

MySql.Data.MySqlClient.MySqlException
      HResult=0x80004005
      Message=Fatal error encountered during command execution.
      Source=MySql.Data
      StackTrace:
       at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
       at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
       at serverAnalizUrunBot.Form1.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in C:\Users\sezer\source\repos\serverAnalizUrunBot\serverAnalizUrunBot\Form1.cs:line 43
       at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
       at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
    
      This exception was originally thrown at this call stack:
        [External Code]
    
    Inner Exception 1:
    MySqlException: Fatal error encountered attempting to read the resultset.
    
    Inner Exception 2:
    MySqlException: Reading from the stream has failed.
    
    Inner Exception 3:
    IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
    
    Inner Exception 4:
    SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond