una función que extraiga el nombre de las hojas de un archivo excel y las pase a un arreglo. Agregar

public void ReadExcelAndCreateArray(string FilePath)
{
    string fileExtension = Path.GetExtension(FilePath);
    switch (fileExtension)
    {
    case ".xls":
            ReadXls(FilePath);
            break;
    case ".xlsx":
            ReadXlsx(FilePath);
            break;
}

public void ReadXls(string FilePath)
{
    try
    {
        // Open the Excel file using ClosedXML.
        // Keep in mind the Excel file cannot be open when trying to read it
        using (XLWorkbook workBook = new XLWorkbook(FilePath))
        {
            //Read the first Sheet from Excel file.
            IXLWorksheet workSheet = workBook.Worksheet(1);

            //Create a new DataTable.
            DataTable dt = new DataTable();

            //Loop through the Worksheet rows.
            bool firstRow = true;
            foreach (IXLRow row in workSheet.Rows())
            {
                //Use the