DataTAble to Generic List

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
    class IndexName
    {
        public int Index { get; set; }
        public string Name { get; set; }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("Index"));
        dt.Columns.Add(new DataColumn("Name"));
        for (int i = 0; i < 10; i++) { DataRow row = dt.NewRow(); row["Index"] = i; row["Name"] = "dummyData" + i.ToString(); dt.Rows.Add(row); }
        //bind the gridview
        List<string> obj = new List<string>();
        obj = dt.Select().Select(t => t.Field<string>("index")).ToList();
        List<IndexName> obj2 = new List<IndexName>();
        obj2 = (from DataRow dr in dt.Rows
                select new IndexName
                {
                    Index = Convert.ToInt32(dr["Index"]),
                    Name = Convert.ToString(dr["Name"])
                }).ToList();
    }
}
Second Example:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using employee;
using System.Collections.Generic;
public partial class Default2 : System.Web.UI.Page
{
    DataSet ds = new DataSet("Collections");
    DataTable dt = new DataTable();
    DataTable dt1 = new DataTable();
    protected void Page_Load(object sender, EventArgs e)
    {
        TestCollections();
        //FillData();
        LINQJoinOnDataTable();
    }
    private void TestCollections()
    {
        dt.Columns.Add("SrNo", Type.GetType("System.Int32"));
        dt.Columns.Add("Data", Type.GetType("System.String"));
        DataRow dr = dt.NewRow();
        dr["SrNo"] = "1";
        dr["Data"] = "A";
        dt.Rows.Add(dr);
        DataRow dr1 = dt.NewRow();
        dr1["SrNo"] = "2";
        dr1["Data"] = "B";
        dt.Rows.Add(dr1);
       
        dt1.Columns.Add("SrNo", Type.GetType("System.Int32"));
        dt1.Columns.Add("Data", Type.GetType("System.String"));
        DataRow dr2 = dt1.NewRow();
        dr2["SrNo"] = "1";
        dr2["Data"] = "One";
        dt1.Rows.Add(dr2);
        DataRow dr3 = dt1.NewRow();
        dr3["SrNo"] = "1";
        dr3["Data"] = "Two";
        dt1.Rows.Add(dr3);
        DataRow dr4 = dt1.NewRow();
        dr4["SrNo"] = "3";
        dr4["Data"] = "Three";
        dt1.Rows.Add(dr4);
        //var data = dt.Select().Select(t => new { SrNo = Convert.ToInt32(t["SrNo"]), Data = Convert.ToString(t["Data"]) }).Where(t => t.Data == "B").ToList();
        //int abc = (from d in data select d.SrNo).SingleOrDefault();
        //var data1 = dt1.Select().Select(t => new { SrNo = Convert.ToInt32(t["SrNo"]), Data = Convert.ToString(t["Data"]) }).Where(t => t.SrNo == abc).ToList();
        //string[] a = (from d in data1 select d.Data).ToArray();
    }
    private void FillData()
    {
        Employee emp1 = new Employee() { ID = 1, Name = "A", DeptID = 1 };
        Employee emp2 = new Employee() { ID = 2, Name = "B", DeptID = 1 };
        Employee emp3 = new Employee() { ID = 3, Name = "C", DeptID = 1 };
        Employee emp4 = new Employee() { ID = 4, Name = "D", DeptID = 2 };
        Employee emp5 = new Employee() { ID = 5, Name = "E", DeptID = 2 };
        Employee emp6 = new Employee() { ID = 6, Name = "F", DeptID = 2 };
        Employee emp7 = new Employee() { ID = 7, Name = "G", DeptID = 6 };
        Employee emp8 = new Employee() { ID = 8, Name = "H", DeptID = 3 };
        Employee emp9 = new Employee() { ID = 9, Name = "I", DeptID = 3 };
        Employee emp10 = new Employee() { ID = 10, Name = "J", DeptID = 7 };
        Employee emp11 = new Employee() { ID = 11, Name = "K", DeptID = 7 };
        Employee emp12 = new Employee() { ID = 12, Name = "L", DeptID = 5 };
        Department Dept1 = new Department() { ID = 1, Name = "Development" };
        Department Dept2 = new Department() { ID = 2, Name = "Testing" };
        Department Dept3 = new Department() { ID = 3, Name = "Marketing" };
        Department Dept4 = new Department() { ID = 4, Name = "Support" };
        List<Employee> ListOfEmployees = new List<Employee>();
        ListOfEmployees.AddRange((new Employee[] { emp1, emp2, emp3, emp4, emp5, emp6, emp7,emp8, emp9, emp10, emp11, emp12 }));
        List<Department> ListOfDepartment = new List<Department>();
        ListOfDepartment.AddRange(new Department[] { Dept1, Dept2, Dept3, Dept4 });
        var data = from emp in ListOfEmployees
                   join dept in ListOfDepartment on emp.DeptID equals dept.ID where emp.DeptID==1
                   select new
                   {
                       EmployeeName = emp.Name,
                       DepartmentName=dept.Name
                   };
    }
    private void LINQJoinOnDataTable()
    {
        var result =  from p in dt.AsEnumerable()
                        join q in dt1.AsEnumerable() on p.Field<int>("SrNo") equals q.Field<int>("SrNo") where p.Field<string>("Data")=="A"
                        select new
                        {
                            ID = q.Field<int>("SrNo"),
                            Type = q.Field<string>("Data")
                        };
    }
}