Database İçin Oluşturduğum Class

using System;
using System.Collections.Generic;
using System.Web;
using System.Data.SqlClient;
using System.Data;


///

/// Summary description for database
///

public class database
{
public database()
{
//
// TODO: Add constructor logic here
//
}

    public void insertNewBook(book newBook)
    {
        SqlConnection conn = new SqlConnection();
        conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["localSqlServer"].ToString();
        conn.Open();

        SqlCommand cmd=new SqlCommand();
        cmd.CommandType=System.Data.CommandType.StoredProcedure;
        cmd.CommandText="insertNewBook";
      

        SqlParameter bookID=new SqlParameter("@bookID",SqlDbType.BigInt);
        bookID.Value=newBook.bookID;
        cmd.Parameters.Add(bookID);


        SqlParameter bookTitle=new SqlParameter("@bookTitle",SqlDbType.VarChar,100);
        bookTitle.Value=newBook.bookTitle;
        cmd.Parameters.Add(bookTitle);

        SqlParameter bookAuthor=new SqlParameter("@bookAuthor",SqlDbType.VarChar,100);
        bookAuthor.Value=newBook.bookAuthor;
        cmd.Parameters.Add(bookAuthor);


        SqlParameter bookImage=new SqlParameter("@bookImage",SqlDbType.Image);
        bookImage.Value=newBook.bookImage;
        cmd.Parameters.Add(bookImage);

        cmd.Connection = conn;
        cmd.ExecuteNonQuery();


        cmd.Dispose();
        conn.Close();
        conn.Dispose();
  }