title: How do I sum all rows of a specific header in an excel file with c#?
body: <p>I have a excel table with 1 sheet. That sheet has headers in row 1.
  One of the headers is Amount.</p>
  
  <p>I want to read all rows from that header and get the sum of it independently of the number or rows, which is never the same, into a variable of type float.</p>
  
  <p>I'm doing this with c#.</p>
  
  <p>I open the workbook, I get the active sheet and then nothing, I get blocked.</p>
  
  <p>How do I go about this?
  Rui Martins</p>