c# - How to get data from every single cell? -

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i'm doing app friend works in hospital.

what app doing grab data excel, sort , display it. stuck on grabbing data. excel file has 3 columns , n rows. cells of first column not filled in.

i have tried different ways of taking data, , wasn't able make working right. trying include empty cells search, temp returns me empty strings.

how iterate each row until end, , on every iteration grab data each column, if empty - return ""?

            excel.application excelapp = new microsoft.office.interop.excel.application();             excel.workbook excelworkbook = excelapp.workbooks.open(currentexcellocation, 0, true, 5, "", "", false, excel.xlplatform.xlwindows,                                                                         "", false, true, 0, false, false, false);             excel.sheets excelsheets = excelworkbook.worksheets;             excel.worksheet excelworksheet = (excel.worksheet)excelsheets.get_item(3);             int itotalrows = excelworksheet.usedrange.rows.count;             (int = 1; <= itotalrows; ++i)             {                 string templ = (excelworksheet.cells[i, 1] excel.range).specialcells(excel.xlcelltype.xlcelltypeblanks).text.tostring();                 if (templ != "") { temp = templ; }                 string temps = (excelworksheet.cells[i, 2] excel.range).value2.tostring();                 string tempd = (excelworksheet.cells[i, 3] excel.range).value2.tostring();                 datascheme.symptoms tempsd = new datascheme.symptoms(temps, tempd);                 if (data.findindex(a => a.location == temp) < 0) { data.add(new datascheme(temp)); }                 data.find(b => b.location == temp).symplist.add(tempsd);                 textbox6.text += temp + environment.newline;             }             excelworkbook.close(0);             excelapp.quit();             marshal.finalreleasecomobject(excelapp);             marshal.finalreleasecomobject(excelworkbook);             marshal.finalreleasecomobject(excelsheets);             marshal.finalreleasecomobject(excelworksheet);

get closedxml nuget, follow method return excel data datatable way can data each row. 

    public static datatable importsheet(string filename)     {         var datatable = new datatable();         var workbook = new xlworkbook(filename);         var xlworksheet = workbook.worksheet(1);         var range = xlworksheet.range(xlworksheet.firstcellused(), xlworksheet.lastcellused());          var col = range.columncount();         var row = range.rowcount();          datatable.clear();         (var = 1; <= col; i++)         {             var column = xlworksheet.cell(1, i);             datatable.columns.add(column.value.tostring());         }          var firstheadrow = 0;         foreach (var item in range.rows())         {             if (firstheadrow != 0)             {                 var array = new object[col];                 (var y = 1; y <= col; y++)                 {                     array[y - 1] = item.cell(y).value;                 }                  datatable.rows.add(array);             }             firstheadrow++;         }         return datatable;     }

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