Inserting data from an Excel Spreadsheet into Microsoft Access using C# not working for specific fields

Question

Currently importing data from Excel into a MS Access database using a C# client, which works perfectly the majority of the time.

Having specific instances wheres it doesn't work with no error being thrown. For the life of me i cant understand why.

My SQL Statement:-

INSERT INTO [MS Access;DATABASE=C:\\TempReport.mdb].[Bucket]
(ID,[RefName],[0M],[3M],[6M],[1Y],[2Y],[3Y],[4Y],[5Y],[7Y],[10Y],[12Y],[15Y],[20Y],[25Y],[30Y],[40Y],[40Y+]) 
SELECT
7,[RefName],[0M],[3M],[6M],[1Y],[2Y],[3Y],[4Y],[5Y],[7Y],[10Y],[12Y],[15Y],[20Y],[25Y],[30Y],[40Y],[40Y+])  FROM [MainReport$C29:AA48]

ConnectionString:- "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=[FILE];Extended Properties='Excel 8.0;HDR=Yes;IMEX=0;'";

Problem:- Columns 20Y,25Y,30Y,40Y, [40Y+] never populate even if theres data, with no error being thrown.

Please Help!

Answer 1

Found the answer with some trial and error.

Changed the IMEX setting in the connection string to 1, from 0. This now works.