Import many excel sheets into C#

Question

hi, i would like to ask several questions

 

1)how to select/import many excel sheets into c#, so i can transpose all the excel sheets

 

2) then, i want to change the position of excel row(eg, row 1 become row 500, and row 500 become row 1)

 

3) is that possible C# can process all the excel data into video?