linq with dataTable in c#

Question

I am using datatable on which I want to use Linq. but as i am new to linq i dont know how it uses. I google it I got lots of information which is not sufficient like. If I am using datatable and i got info like :

DataRow r = from dr in ds.Tables["Customers"].AsEnumerable()

where dr.Field<Guid>("customerid").ToString() = row[2].ToString()

select dr;    

dt.ImportRow(r);

and I have lots of queries like what is "dr". dr.fields?, ".AsEnumerable()" is not present at my side.

Even this code also doesnt work:

IEnumerable<DataRow> r = from dr in ds.Tables["Customers"].Select().Where(x => x.Field<Guid>("customerid").ToString() == row[2].ToString())
                        select dr;

So can anyone please give me link on which i got all information from beggining on linq.

Answer 1

You should iterate rows to achive it

var r = ds.Tables["Customers"].Rows
  .Cast<DataRow>()
  .Where(r => r["fieldName"].ToString() == "Test");

Answer 2

Hope this can help you.

LINQ to DataSet

http://msdn.microsoft.com/en-us/library/bb386921.aspx

Answer 3

It's like a SQL select query, where dr is the * (that is, it is the returned data).

Some nice examples: http://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b