C# excel - extract only rows within a range of columns

I have the following code:

Excel.Range range = workSheet.UsedRange;
for (rowCount = 2; rowCount <= range.Rows.Count; rowCount++)
  {
     //Do something here
  }

However, I encounter the following problem. If I have the following excel data:

cell1, cell2, cell3

cell4, cell5, cell6

..............cell7

range.Rows.Count will return 3. However, I don't care about column C - it has some data that is used for drop-down lists within say column 1. How can I get the rang开发者_运维技巧e.Rows.Count only for columns A and B?

For example:

---

Assuming there are no blanks in column A, just walk down rows until you hit a blank row using range.Offset(x,y): (sorry, I'm more fluent with Excel VBA, you'll have to translate to C#)

Dim myCell as Range
set myCell = workSheet.Range("A2");
Do Until myCell.Formula = ""
     'Do something here
     set myCell = myCell.Offset(1,0) 'Moves down a row 
Loop

Or just loop through numerically using Worksheet.Cells(row,col):

Dim myRow as Integer
myRow = 2
Do Until cells(myrow,2).Formula = ""
     'Do something here
     myRow = myRow + 1
Loop

Edit: You could also use Range("A1").End(xlDown) to find the last populated cell of the first column. This should work with your current logic. Something like (I'll try it in C#):

Excel.Range range = workSheet.Range("A1", Range("A1").End(xlDown));
for (rowCount = 2; rowCount <= range.Rows.Count; rowCount++)
  {
     //Do something here
  }