the pokemon machines csv eater

public string GetValueFromCSVStore(string csvfilename, string columnname, string additionalkeys)
        {
            int i, j, k;
            int columnid = -1;
            storedcsv tempcsv;
            string[] columnnames;
            string[] additionalkeybuffer;
            string[] additionalkeyvaluebuffer;
            string[] buffer;
            char[] delimiterChars = { ',' };
            char[] keysdelimiterChars = { '|' };
            bool additionalkeycheck = false;
            bool ignorethisline = false;
            List<csvsearchkey> searchkeys = new List<csvsearchkey>();
            csvsearchkey tempsearchkey = new csvsearchkey();
            //load the right file
            tempcsv = thejerkstore.Find(delegate(storedcsv searchcsv) { return searchcsv.myname == csvfilename; });
            //find the column names, we find the column needed for this get
            columnnames = tempcsv.Lines[0].Split(delimiterChars);
            for (i = 0; i < columnnames.Length; i++)
            {
                if (columnnames[i] == columnname)
                {
                    columnid = i;
                }

            }
            //we parse the additonal keys, with 2 splits
            additionalkeybuffer = additionalkeys.Split(delimiterChars);
            for (i = 0; i < additionalkeybuffer.Length; i++)
            {
                additionalkeyvaluebuffer = additionalkeybuffer[i].Split(keysdelimiterChars);
                if (additionalkeyvaluebuffer.Length == 2)
                {
                    tempsearchkey.columnname = additionalkeyvaluebuffer[0];
                    tempsearchkey.val = additionalkeyvaluebuffer[1];
                    //once we know the column/value pair to check we need to column for that get
                    for (j = 0; j < columnnames.Length; j++)
                    {
                        if (tempsearchkey.columnname == columnnames[j])
                        {
                            tempsearchkey.columnid = j;
                        }
                    }
                    searchkeys.Add(tempsearchkey);
                }
            }

            //now we read every line of the file
            for (i = 0; i < tempcsv.Lines.Length; i++)
            {
                ignorethisline = false;
                buffer = tempcsv.Lines[i].Split(delimiterChars);
                for (j = 0; j < buffer.Length; j++)
                {
                    //and check if against the additonal keys
                    for (k = 0; k < searchkeys.Count; k++)
                    {
                        //if the value matches the condition is met
                        if (buffer.Length > columnid)
                        {
                            if (buffer[searchkeys[k].columnid] == searchkeys[k].val)
                            {
                                additionalkeycheck = true;
                            }
                            else
                            {
                                //if it isn't, and we had a match before, then this is NOT the right line, move on.
                                if (additionalkeycheck == true)
                                {
                                    ignorethisline = true;
                                }
                            }
                        }
                        else
                        {
                            ignorethisline = true;
                        }
                    }
                    //this is it.
                    if ((ignorethisline == false) && (additionalkeycheck == true))
                    {
                        if (columnid != -1)
                        {
                            return buffer[columnid];
                        }
                    }
                }
            }
            return "";
        }