[c#] How do I get an Excel range using row and column numbers in VSTO / C#?

If you want like Cells(Rows.Count, 1).End(xlUp).Row , you can do it.

just use the following code:

using Excel = Microsoft.Office.Interop.Excel;

string xlBk = @"D:\Test.xlsx";
Excel.Application xlApp;
Excel.Workbook xlWb;
Excel.Worksheet xlWs;

Excel.Range rng;
int iLast;

xlApp = new Excel.Application();
xlWb = xlApp.Workbooks.Open(xlBk, 0, true, 5, "", "", true, 
Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);

xlWs = (Excel.Worksheet)xlWb.Worksheets.get_Item(1);

iLast = xlWs.Rows.Count;
rng = (Excel.Range)xlWs.Cells[iLast, 1];
iLast = rng.get_End(Excel.XlDirection.xlUp).Row;

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