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public ArrayList ExpandAlnumRange(string startVal, string endVal){
			if(startVal.Length!=endVal.Length)
				return null;
			if(startVal.Length>1){
				ArrayList ret=new ArrayList();
				string startBegin=startVal.Substring(0,startVal.Length-1);
				string startEnd=startVal.Substring(startVal.Length-1,1);
				string endBegin=endVal.Substring(0,endVal.Length-1);
				string endEnd=endVal.Substring(endVal.Length-1,1);
				ArrayList endRange=ExpandAlnumRange(startEnd, endEnd);
				foreach(string beginText in ExpandAlnumRange(startBegin, endBegin)){
					foreach(string endText in endRange){
						ret.Add(beginText+endText);
					}
				}
				return ret;
			}else{
				ArrayList ret=new ArrayList();
				char start=startVal[0];
				char end=endVal[0];
				if(end<start)
					return null;
				char curVal=start;
				do{
					ret.Add(curVal.ToString());
					if(curVal==end)
						break;
					curVal++;

					if(curVal>'Z' && curVal<'0')
						curVal='A';
					else if(curVal>'9' && curVal<'A')
						curVal='0';

				}while(true);
				//ret.Add(curVal.ToString());
				return ret;
			}
		}