How to match value if present else get all records in SQL Server Query

Hello

In my table i saved value like abcd-30"-20p-(NP),bcdf-30"-20p-(NP).

now i want to search table data through this value. i have one dropdownlist which contain values

abcd, bcdf. and now i want to search table data by select value from dropdownlist. 

and in second search i have a textbox also. if i select value from dropdownlist and fill textbox value 30. then it should also show table data which has been match.

How can i search like this. 

Thanks