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Hi Srinivas,


You should implment IEquatable interface for that.



using System;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//this is my class
public class LibraryClass : IEquatable
{
    #region Fields
    int bookId;
    string bookName;
    string category;
    string authorName;
    #endregion
    #region Properties
    public int BookId
    {
        get { return bookId; }
        set { bookId = value; }
    }
    public string BookName
    {
        get { return bookName; }
        set { bookName = value; }
    }
    public string Category
    {
        get { return category; }
        set { category = value; }
    }
    public string AuthorName
    {
        get { return authorName; }
        set { authorName = value; }
    }
    #endregion
    public LibraryClass()
    {
    }
    public LibraryClass(int a, string b, string c, string d)
    {
        this.BookId = a;
        this.BookName = b;
        this.category = c;
        this.AuthorName = d;
    }
    public override string ToString()
    {
        return string.Format("{0,-5}{1,-10}{2,-10}{3,-10}", BookId, BookName, Category, AuthorName);
    }

    public override bool Equals(object obj)
    {
        return this.Equals(obj as LibraryClass);
    }

    public bool Equals(LibraryClass p)
    {
        // If parameter is null, return false.
        if (Object.ReferenceEquals(p, null))
        {
            return false;
        }

        // Optimization for a common success case.
        if (Object.ReferenceEquals(this, p))
        {
            return true;
        }

        // If run-time types are not exactly the same, return false.
        if (this.GetType() != p.GetType())
            return false;

        return (bookName == p.BookName);
    }
}


Here, also I check the bookname and if there is a book with the same bookname in the list it will return  true for contains. But you can change it as you want.


Now you can call contains method.


            LinkedList obj = new LinkedList();
            obj.AddFirst(new LibraryClass(10, "srinivas", "fds", "dsffdsf"));
            obj.AddFirst(new LibraryClass(20, "srini", "ffds", "ddsfsffdsf"));
            obj.AddFirst(new LibraryClass(30, "sriniffsf", "ffdfsfds", "dfdsdsfsffdsf"));
            foreach (LibraryClass val in obj)
            {
                Console.WriteLine(val);
            }

            //Now you create an object with a book name "srini"
            LibraryClass temp = new LibraryClass(20, "srini", "ffdsfff", "fdsf");

            //Now you check there is an object in the list with the same name.
 if (obj.Contains(temp))//returns true as there is a object with same bookname
            {

            }



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