LinqToExcel, Row into Array

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ASP.NET

LINQ

MS-Excel

I need to collect all rows in string, I am using LinqToExcel query, I have many others operation that I need to use LinqToExcel package.

My problem is that I am not able to convert all rows value in single string,

My code:

var excelFile = new ExcelQueryFactory(Server.MapPath("Documents//Existing Users10.xlsx"));
excelFile.DatabaseEngine = LinqToExcel.Domain.DatabaseEngine.Ace;
var list= (from a in excelFile.Worksheet("Existing Users")
                   select new MyClass
                   {

                       email= a["Email"].Value.ToString(),
                       values= string.Join(",", a.ToList().Select(y => y.Value))

                   }).ToList();

a.ToList() giving me error that The given key was not present in the dictionary.

Thanks