Load and delete sheet from dbenfachALL.xlsx(https://www.devexpress.com/Support/Center/Question/Details/Q571743),
System.ArgumentOutOfRangeException throws.

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using System;
using System.IO;
using Infragistics.Documents.Excel;

namespace ConApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Stream stream = File.Open("dbenfachALL.xlsx", FileMode.OpenOrCreate);
            Workbook wb = Workbook.Load(stream);
            if (wb == null)
            {
                return;
            }

            var count = wb.Worksheets.Count;
            for (int i = count - 1; i > 0; i--)
            {
                wb.Worksheets.RemoveAt(i);
            }
        }
    }
}