Updating any Object through Linq Query

public class TestClass

{

    public String RollNo { get; set; }

    public String Name { get; set; }

    public String ClassName { get; set; }

}

ObservableCollection<TestClass> aaa = new ObservableCollection<TestClass>();

aaa.Add(new TestClass() {

RollNo = "1602", Name = "Khalid Rafique", ClassName = "A" });

aaa.Add(new TestClass() {

RollNo = "1702", Name = "Jamal Ali Khan", ClassName = "A" });

Method1

var result = aaa.Where(c => c.RollNo == "1702");

foreach (TestClass tc in result)

{

tc.Name = textBox4.Text;

      tc.ClassName = textBox1.Text;

}

Method2

aaa

    .Where(c => c.RollNo == "1702")

    .Update(m =>

                {

                  m.Name = textBox4.Text;

                  m.ClassName = textBox1.Text;

                });

Following is the class having extensible Method of Linq update.

public static class LinqExtensableMethods

{

public static void Update(this IEnumerable source, params Action[] updates)

{

    if (source == null)

      throw new ArgumentNullException("source");

    if (updates == null)

      throw new ArgumentNullException("updates");

       foreach (T item in source)

       {

                foreach (Action update in updates)

                {

                    update(item);

                }

       }

   }

}

Method3

var result =  ocTextClass .Where(c => c.RollNo == "1702").ToList().ForEach(tc => tc.Name=TextBox.Text);