How can I get the data falling between two selected strings?

Hi

I have data e.g. 000.DGDH.34H, 222.JJ8D ... 999.YDH77, A.383JD, B.HDJ738, D.J8829 ... Z.78WY8. I have to select the data that falls between the two strings. If the selected two strings are 000 and 777, it should return the data from 000 to 777. 

If the selected two strings are 000 and 777, it should return the data from 000 to 777. 

If the selected two strings are A and S, it should return the data between A and S.

How can I do that in ASP.Net MVC4.