Question

I have big DataTable I want to get subset of this DataTable represented as DataTable either.
Briefly saying how do I select particular columns in DataTable.

I was trying something like this but it doesn’t work…

DataTable dTable = new DataTable();
...
...
...
        DataTable dt = from field in dTable
                       where field.Field<string>("Manager")
                       where field.Field<string>("Phone")
                       select field;

Maybe my code is wrong, how do I get “managers” and “Phone” columns from one DataTable to another without looping thought it?

Answer 1

Reference the DataTableExtensions –

http://msdn.microsoft.com/en-us/library/system.data.datatableextensions.asenumerable.aspx

Then…

var whatever = dTable.AsEnumerable();

Then per the MSDN example…

var productNames = from products in table.AsEnumerable() 
      select products.Field<string>("ProductName");

Edit/update: Unfortunately I do not think there is a built in direct cast back to a DataTable with a different schema. You have to use a DataTable? I believe it… as it might be too much effort to refactor and test your code. Good luck and keep us posted as working with strongly-typed lists are much more fun.