How to sum all values in a column of an excel/Datatable?

[ClaytonM]

@AlexRPA
If you just need to sum a column, I would suggest using the syntax like this:

tblaccount.AsEnumerable.Sum(Function(x) Convert.ToDouble(x("AVAIL_BALANCE").ToString.Trim) ).ToString

You can filter to only certain columns also using .Where, like this:

tblaccount.AsEnumerable.Where(Function(x) x("column").ToString.Trim.Equals("123456")).Sum(Function(x) Convert.ToDouble(x("AVAIL_BALANCE").ToString.Trim) ).ToString

I hope this helps.

Regards.