Well, LINQ operates on things that implement IEnumerable.  So the first  
thing you need to do is convert your string to something that's  
enumerable.  Then you can use LINQ to create a query from that result that  
returns instances of your class based on the data in each line.

I've posted below an example of a very simple program that does this.  If  
it's not the sort of thing you're looking for, you will probably want to  
rephrase your question so that it's more specific.

By the way, I'm kind of new at this LINQ stuff.  I'm hoping that one of  
the experts will point out some ways to clean up my code a bit (I'm  
especially skeptical of my use of the lambda expression, since with two  
statements in the method I'm hard-pressed to see how that syntax is better  
than an anonymous method :) ).

Pete

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace TestLinqFromString
{
    class Program
    {
        class Record
        {
            public readonly string field1;
            public readonly string field2;

            public Record(string field1, string field2)
            {
                this.field1 = field1;
                this.field2 = field2;
            }
        }

        static void Main(string[] args)
        {
            string strInput =
                "A field1\tA field2\r\n" +
                "B field1\tB field2\r\n" +
                "C field1\tC field2";

            IEnumerable<Record> query = strInput.Split(new string[]  
{ "\r\n" }, StringSplitOptions.None)
                .Select(str =>
                    {
                        string[] strFields = str.Split('\t');
                        return new Record(strFields[0], strFields[1]);
                    });

            foreach (Record rec in query)
            {
                Console.WriteLine(rec.field1 + ", " + rec.field2);
            }

            Console.ReadLine();
        }
    }
}