Getting error when fetching MySql data from .net ; ( Fatal error encountered during command execution)

Question

I am fetching data from MySQL from.Net application. It is throwing errors sometimes as below

MySql.Data.MySqlClient.MySqlException (0x80004005): Fatal error encountered during command execution.
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Fatal error encountered attempting to read the resultset.
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Reading from the stream has failed.
---> System.IO.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.
---> System.Net.Sockets.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
    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
    --- End of inner exception stack trace ---
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
    at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
    at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
    at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
    at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
    at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
    at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
    at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int64& insertedId)
    at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
    at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
    at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
    at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
    at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
    at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
    at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
    at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
    at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
    at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)

My code as below

_mySqlConn = new MySqlConnection(ConfigurationManager.ConnectionStrings["BiometricConnectionPush"].ToString());
_mySqlConn.Open();
_strQry = "SELECT * FROM biologs WHERE id>" + LastPunchId + " ORDER BY id ASC LIMIT " + RowLimit.ToString();

MySqlCommand _sqlCmd = new MySqlCommand();
_sqlCmd.CommandText = _strQry;
_sqlCmd.CommandTimeout = 100000;
_sqlCmd.Connection = _mySqlConn;
_sqlCmd.CommandType = CommandType.Text;

Data = new DataSet();
_mySqlDa = new MySqlDataAdapter(_sqlCmd);
_mySqlDa.Fill(Data);

Answer 1

System.IO.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.

System.Net.Sockets.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.

Your MySQL server can't be contacted, or things time out.

Note you've explicitly set your command timeout to 10 seconds; if for some reason execution your query takes more than that, you'd get that exception.