Adding formula to cell Exception from HRESULT: 0x800A03EC

Question

I\'m trying to add a formula to cell but i got the error Exception from HRESULT: 0x800A03EC There are lots of posts with similar issues however none could help

Answer 1

Hans Passant is correct, but there may be additional settings needed to enable Excel's ability to handle the cadence of your code operations.

Here's a good set of options to make Excel capable of processing requests faster: Turn Automatic Calculations Off/On

A summary of what worked for me:

    using Excel = Microsoft.Office.Interop.Excel;

    public class ExcelAppWrapper : IDisposable
    {
        private Excel.Application _application;

        public ExcelAppWrapper()
        {
            _application = new Excel.Application { Visible = true };
            _application.Workbooks.Add(Missing.Value);
            //there must be a workbook before setting Application.Calculation
            ConfigureApplication(false);
        }

        public void Dispose()
        {
            ConfigureApplication(true);
        }

        private void ConfigureApplication(bool enable)
        {
            _application.Calculation = enable ? XlCalculation.xlCalculationAutomatic : XlCalculation.xlCalculationManual;
            _application.EnableEvents = enable;
            _application.ScreenUpdating = enable;
            _application.DisplayStatusBar = enable;
        }
    }