Hou to upload multiple Excel file in c# windows form applica

Question

I have multiple excel file where contains salary sheet data. like that..

 

EMP1001.xls or EMP1001.xlsx    ---- here EMP1001 is a employee no of a employee

month	basic	da	hra	total
jan	20000	15000	3000	38000
feb	19800	14000	2860	36660
mar	23200	16000	3050	42250

 

EMP1002.xls or EMP1002.xlsx

 

month	basic	da	hra	total
jan	8000	14000	2500	24500
feb	9000	17000	2100	28100
mar	10000	19000	1800	30800

 

 I create a database table and extract excel data

 

emp_no	month	basic	da	hra	net
EMP1001	jan	20000	15000	3000	38000
EMP1001	feb	19800	14000	2860	36660
EMP1001	mar	23200	16000	3050	42250
EMP1002	jan	8000	14000	2500	24500
EMP1002	feb	9000	17000	2100	28100
EMP1002	mar	10000	19000	1800	30800

 

Actually I done all of these process with single file upload.

 

I want to upload multiple excel file and insert these data into database from excel file.

 

Please help me.