>Hello Viv
>
>Trying to exclude LINQ in that part of the app. I like to reduce the .NET version to allow a greater range of computers which are then able to run my app.

EnumerableRowCollection resides in System.Data.DatasetExtensions, the ElementAtOrDefault extension method in System.Core.dll. Both were introduced in .NET 3.5 for 'Linq to Dataset'. If you really want your application to run on earlier versions of the framework then you should explicitly set the target version for each project before compiliing (or, better yet, before coding :-}). But it you insist on supporting as far back as .NET 2 you will be losing a *lot* of very useful functionality - and upgrading the .NET version on client machines is not a big deal.

Setting the target *platform* is a different thing entirely. It does *not* affect the compiled (IL) code in any way apart from setting flags indicating which platforms should be used - targeting x86 rather than 'Any CPU' simply means your application will still run as 32 bit when on a 64bit machine.

>I am already having the issue with WindowsXP 64-bit - my app doesn't run on there. I think I read in my reasearch that LINQ won't run in that platform.

Don't think that's true. What problems do you have? What's your development platform? Will the app run as 32bit on that machine (as per above)?

>
>
>
>>>Hello Everybody.
>>>
>>>Ok - so I completed my first .NET app (desktop in vb.net and a asp.net web portion), compiled it in x86, install it on WindowsXP (32bit) and Windows 7 (64bit) machines, and it works great. - Hurray :-)
>>>
>>>Now i have some Windows XP 64 bit machines where i got an error right when I am starting the app (the desktop program). I think there was some mentioning about the System.Windows.Forms namespace.
>>>
>>>Well, so I am thinking to myself: "sure that makes sence, just recompile as "AnyCPU".
>>>
>>>Oops - maybe not. First i got some complaints about LINQ - so i converted that code to the System.Data.SqlClient stuff. Still everything works great on the other machienes (reinstalled).
>>>
>>>But now i get an error when compiling (not the code sections I converted) as follows (about 72 errors):

>>>Dim MasterTypeRow As DataTable = _
>>>   Me.TableAdapterManager1.DocumentTypesTableAdapter.GetType_Level0( _ 
>>>      Me.DocList(nRow, 3), Me.DocList(nRow, 4), Me.DocList(nRow, 5))
>>>
>>>' this following line triggers the error
>>>Dim MasterType As String = MasterTypeRow(0)("Type_level0")

>>>throughs the error:

>>>'ElementAtOrDefault' is not a member of 'System.Data.EnumerableRowCollection(Of System.Data.DataRow)'.

>>>Does anybody have an idea what i am missing here?
>>
>>Importing System.Linq ?
>>
>>>
>>>Thank you for all your help!