How to return an array of class type and fill?

Question

I have a function which is supposed to return an array of class type.

So from database I picked data and filled datatable. Now from datatable I am picking columns value

Answer 1

This is only an indirect answer, but: ultimately, the thing you are trying to do is a solved problem, with lots of tools existing to do all the work for you. Since this is a simple scenario, "Dapper" would make this trivial. I'll give a C# example here, as my VB level is read-only:

List BindGridInfoFunctionalLocation()
{
    // note: column aliases to match properties on AssetsDto
    var results = connection.Query(@"
select  FunctionalLocation as 'ASSETTAG',
        EquipmentDescription as 'ASSETDESC',
        Area as 'PARENTTAG',
        EqptType as 'ASSETTYPE'
from    EngineeringData").AsList();

    gv_InfoFunctionalLocation.DataSource = results;
    gv_InfoFunctionalLocation.DataBind()
    return results;
}