Access :: Select & Update Query At The Same Time?

Currently I run 2 separate queries to update + retrieve a tickent number. What happens if there're 2 users clicking on the same button at the same time? Could somehow two updates being run first and then both users get back the same ticket number?

string mySql = "UPDATE TicketCounter SET TicketNumber = (TicketNumber + 1)";
OleDbConnection myConnection = new OleDbConnection(accessConnStr);
OleDbCommand myCmd = new OleDbCommand(mySql, myConnection);
myCmd.Connection.Open();
myCmd.ExecuteNonQuery();
mySql = "SELECT TicketNumber FROM TicketCounter"
myCmd.CommandText = mySql;
OleDbDataReader myReader = myCmd.ExecuteReader();