Changing the value in a drop down list Excel C#

Question

so I have asked how to change the value in a cell inside of excel using c#, but what if I want to change the value of a drop down list. The code I am using for sheet modifying i

Answer 1

Microsoft.Office.Interop.Excel.Application oXL = new  Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel._Workbook oWB;
Microsoft.Office.Interop.Excel._Worksheet oSheet;
Microsoft.Office.Interop.Excel.Range oRng;
//create exel
oWB = oXL.Workbooks.Open(@"C:\Users\\Desktop\Test.xlsx");
oXL.Visible = true;//Can make it false when don't want to see the excel file
//give u name of workbook
 string ExcelWorkbookname = oWB.Name;
// statement get the worksheet count  
 int worksheetcount = oWB.Worksheets.Count;
string path = oWB.Path;

oSheet = (_Worksheet)oWB.Sheets.get_Item(1);
string str = oSheet.Name;
//IMP: on Excel right click on drop down u can see the drop down name on left top most corner which u r providing below.
// It can be anything like Drop Down 5,Drop Down 6,Drop Down 7 etc
  var dropdownValue= oSheet.Shapes.Item("Drop Down 5").ControlFormat; 
dropdownValue.ListIndex = 2; //This allows you to change the drop down to 2nd element

//this code works but Interop is very very slow.Instead use Oledb