IErrorInfo.GetDescription error in .net

Question

Hi m Sourabh Dey n m gettng an error IErrorInfo.GetDescription failed with E_FAIL(0x80004005).The code is as given below:

/*using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;*/
using System;
using System.Collections;
using System.Data;
using System.IO;
using System.Data.OleDb;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Configuration;

namespace Project1
{
  class Globals
  {
  //public const string CONNECTION_STRING = "initial catalog=Library;data source=(local);Connect Timeout=30;user id=sa;password=''";
  public static string ConnectionString = "";
  public static string UserName = "";
  public static string Password = "";
  // Users available in system
  public static Hashtable UsersList = new Hashtable();
  // Categories available in system
  public static Hashtable CategoryList = new Hashtable();
  // Books available in system
  public static Hashtable BookList = new Hashtable();
  public static bool isSystemUser = false;
  public static int NUMBER_OF_BOOKS_ALLOWED = 3;
  public Globals()
  {
  //
  // TODO: Add constructor logic here
  //

  }
  /// <summary>
  /// Get all the application data available in system at system start up
  /// </summary>
  public static bool PopulateAppData()
  {

  //Globals.ConnectionString = ConfigurationSettings.AppSettings["LbraryConnectionString"];
  // Globals.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Library.mdb;";
  UsersList.Clear();
  CategoryList.Clear();
  BookList.Clear();
  try
  {
  DataSet ds = new DataSet();
  string OleDbCommand = "select * from Lib_Users ";
  OleDbCommand += "select * from Lib_Book_Categories ";
  OleDbCommand += "select a.Lib_Book_Title,a.Lib_Book_Author_Name,b.Category_Name,count(*) as Qty from Lib_Book_Details a ";
  OleDbCommand += "join Lib_Book_Categories b on b.Category_ID = a.Lib_Book_Category where a.Lib_Book_Issue_Status = 0 and a.Lib_Book_In_Inventory = 1 ";
  OleDbCommand += "group by a.Lib_Book_Title,a.Lib_Book_Author_Name,b.Category_Name";
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  Adapter.SelectCommand.Connection.Close();
  if (ds.Tables[0].Rows.Count > 0)
  {
  for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
  {
  UsersList.Add(ds.Tables[0].Rows[i][1].ToString(), ds.Tables[0].Rows[i][5].ToString());
  }
  }
  if (ds.Tables[1].Rows.Count > 0)
  {
  for (int i = 0; i < ds.Tables[1].Rows.Count; i++)
  {
  CategoryList.Add(ds.Tables[1].Rows[i][0].ToString(), ds.Tables[1].Rows[i][1].ToString());
  }
  }
  if (ds.Tables[2].Rows.Count > 0)
  {
  for (int i = 0; i < ds.Tables[2].Rows.Count; i++)
  {
  BookList.Add(ds.Tables[2].Rows[i][0].ToString() + "~" + ds.Tables[2].Rows[i][1].ToString() + "#" + ds.Tables[2].Rows[i][2].ToString(), ds.Tables[2].Rows[i][3].ToString());
  }
  }
  return true;
  }
  catch (Exception ex)
  {
  throw ex;
  }
  }
  /// <summary>
  /// Adding category in system
  /// </summary>
  /// <param name="CategoryName"></param>
  /// <returns></returns>
  public static bool AddCategory(string CategoryName)
  {
  bool IsSuccess = false;
  if (CategoryList.ContainsValue(CategoryName))
  {
  return IsSuccess;
  }
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "INSERT INTO Lib_Book_Categories (Category_Name) values ('" + CategoryName + "'\r\n)";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count == 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;

  }
  /// <summary>
  /// Login validation
  /// </summary>
  /// <param name="UserName"></param>
  /// <param name="Password"></param>
  /// <returns></returns>
  public static bool ValidateId(string UserName, string Password)
  {
  try
  {
  DataSet ds = new DataSet();
  string OleDbCommand = "select User_Is_System from Lib_Users where User_Name='" + UserName + "' and User_Password ='" + EncryptDecrypt.Encode(Password) + "'";
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  Adapter.SelectCommand.Connection.Close();
  if (ds.Tables[0].Rows.Count > 0)
  {
  if (Convert.ToBoolean(ds.Tables[0].Rows[0]["User_Is_System"]))
  isSystemUser = true;
  else
  isSystemUser = false;
  return true;

  }
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return false;
  }
  /// <summary>
  /// Register a new user
  /// </summary>
  /// <param name="UserName"></param>
  /// <param name="Password"></param>
  /// <returns></returns>
  public static bool RegisterUser(string UserName, string Password)
  {
  bool IsSuccess = false;
  if (UsersList.ContainsKey(UserName))
  {
  return IsSuccess;
  }
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "INSERT INTO Lib_Users (User_Name,User_Password,User_Is_System) values ('" + UserName + "','" + EncryptDecrypt.Encode(Password) + "'," + "0)\r\n";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count == 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;
  }
  /// <summary>
  /// change user password
  /// </summary>
  /// <param name="UserName"></param>
  /// <param name="Password"></param>
  /// <returns></returns>
  public static bool ChangePassword(string UserName, string Password)
  {
  bool IsSuccess = false;
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "update Lib_Users set User_Password = '" + EncryptDecrypt.Encode(Password) + "' where User_Name = '" + UserName + "'\r\n";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count == 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;
  }
  /// <summary>
  /// Add book in system
  /// </summary>
  /// <param name="BookTitle"></param>
  /// <param name="AuthorName"></param>
  /// <param name="catId"></param>
  /// <param name="Quantity"></param>
  /// <param name="isNewEntry"></param>
  /// <returns></returns>
  public static bool AddBook(string BookTitle, string AuthorName, int catId, int Quantity, string PubName, string Pubat, int Pubyear, int Edition, int volume, int Page, double Price, ref bool isNewEntry)
  {
  bool IsSuccess = false;
  try
  {
  DataSet ds = new DataSet();
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "select Lib_Book_ID from Lib_Book_Details where Lib_Book_Issue_Status = 0 and Lib_Book_In_Inventory = 0 and Lib_Book_Title='" + BookTitle + "' and Lib_Book_Category = '" + catId + "' and Lib_Book_Author_Name = '" + AuthorName + "'\r\n";
  OleDbCommand += "Commit Transaction";
  // Check if there is any record for which inventory status is set to false
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  Adapter.SelectCommand.Connection.Close();

  int iCount = 0;
  bool InsertBookData = true;
  if (ds.Tables[0].Rows.Count > 0)
  {
  iCount = ds.Tables[0].Rows.Count;
  }
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn); ;
  if (iCount > 0)
  {
  isNewEntry = false;
  int LoopCount = 0;
  if (iCount >= Quantity)
  {
  LoopCount = Quantity;
  Quantity = 0;
  iCount = 0;
  InsertBookData = false;
  }
  else
  {
  LoopCount = iCount;
  Quantity = Quantity - iCount;
  }
  OleDbCommand = "BEGIN TRANSACTION\r\n";
  // for records having inventory status as false update status to true
  for (int i = 0; i < LoopCount; i++)
  OleDbCommand += "Update Lib_Book_Details set Lib_Book_In_Inventory = 1 where Lib_Book_ID ='" + Convert.ToInt32(ds.Tables[0].Rows[i][0]) + "'\r\n";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count >= 1)
  {
  IsSuccess = true;
  }
  }
  // insert new rows if there are no records or no records with inventory status as false
  // or there are some row with inventory status false but those are less than quantity of
  // books being added
  if (InsertBookData)
  {
  OleDbCommand = "BEGIN TRANSACTION\r\n";
  for (int i = 0; i < Quantity; i++)
  OleDbCommand += "INSERT INTO Lib_Book_Details (Lib_Book_Title,Lib_Book_Category,Lib_Book_Author_Name,Lib_Book_Publisher_Name,Lib_Book_PublisAt_Name,Lib_Book_YearPubish,Lib_Book_Edition,Lib_Book_Volume,Lib_Book_Page,Lib_Book_Price) values ('" + BookTitle + "'," + catId + ",'" + AuthorName + "','" + PubName + "','" + Pubat + "','" + Pubyear + "','" + Edition + "','" + volume + "','" + Page + "','" + Price + "'\r\n)";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count >= 1)
  {
  IsSuccess = true;
  }
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;

  }
  /// <summary>
  /// Remove book from system
  /// </summary>
  /// <param name="BookTitle"></param>
  /// <param name="Quantity"></param>
  /// <param name="AuthorName"></param>
  /// <param name="CategoryName"></param>
  /// <returns></returns>
  public static bool RemoveBook(string BookTitle, int Quantity, string AuthorName, string CategoryName)
  {
  bool IsSuccess = false;
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  // rows are not removed from system but inventory status is set as false and such records
  // are not at all considered in system for issue etc.
  for (int i = 0; i < Quantity; i++)
  {
  OleDbCommand += "update Lib_Book_Details set Lib_Book_In_Inventory = 0 where Lib_Book_ID = ";
  OleDbCommand += "(select top 1 Lib_Book_ID from Lib_Book_Details a join Lib_Book_Categories b on b.Category_ID = a.Lib_Book_Category where a.Lib_Book_Title = '" + BookTitle + "' and a.lib_book_issue_status = 0 and a.Lib_Book_In_Inventory = 1 ";
  OleDbCommand += "and a.Lib_Book_Author_Name= '" + AuthorName + "' and b.Category_Name = '" + CategoryName + "')\r\n";
  }
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count >= 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;

  }
  /// <summary>
  /// Search books
  /// </summary>
  /// <param name="BookTitle"></param>
  /// <param name="Category"></param>
  /// <returns></returns>
  public static DataSet SearchBook(string BookTitle, string Category)
  {
  DataSet ds = new DataSet();
  string OleDbCommand = "";
  // Book and category both criterias are mentioned by user
  // records retrieved will be those books which are there in inventory and not issued
  if (!BookTitle.Equals("") && !Category.Equals(""))
  {
  OleDbCommand = "select a.Lib_Book_Title as 'Book',a.Lib_Book_Author_Name as 'Author',count(*) as AvailbleQty,b.Category_Name as 'Category' from Lib_Book_Details a join Lib_Book_Categories b ";
  OleDbCommand += "on b.Category_ID = a.Lib_Book_Category where Lib_Book_Title = '" + BookTitle + "' and b.Category_Name = '" + Category + "' and Lib_Book_Issue_Status = 0 and a.Lib_Book_In_Inventory = 1 group by a.lib_book_title,a.Lib_Book_Author_Name,b.Category_Name";

  }
  // Book criteria is mentioned by user
  // records retrieved will be those books which are there in inventory and not issued
  if (!BookTitle.Equals("") && Category.Equals(""))
  {
  OleDbCommand = "select a.Lib_Book_Title as 'Book',a.Lib_Book_Author_Name as 'Author',count(*) as AvailbleQty,b.Category_Name as 'Category' from Lib_Book_Details a join Lib_Book_Categories b ";
  OleDbCommand += "on b.Category_ID = a.Lib_Book_Category where Lib_Book_Title = '" + BookTitle + "' and Lib_Book_Issue_Status = 0 and a.Lib_Book_In_Inventory = 1 group by a.Lib_Book_Title,a.Lib_Book_Author_Name,b.Category_Name";
  }
  // Category criteria is mentioned by user
  // records retrieved will be those books which are there in inventory and not issued
  if (BookTitle.Equals("") && !Category.Equals(""))
  {
  OleDbCommand = "select a.Lib_Book_Title as 'Book',a.Lib_Book_Author_Name as 'Author',count(*) as AvailbleQty,b.Category_Name as 'Category' from Lib_Book_Details a join Lib_Book_Categories b ";
  OleDbCommand += "on b.Category_ID = a.Lib_Book_Category where b.Category_Name = '" + Category + "' and Lib_Book_Issue_Status = 0 and a.Lib_Book_In_Inventory = 1 group by a.Lib_Book_Title,a.Lib_Book_Author_Name,b.Category_Name";
  }
  try
  {
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  Adapter.SelectCommand.Connection.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return ds;

  }
  /// <summary>
  /// Chack if a book is already issued to requesting user
  /// </summary>
  /// <param name="BookTitle"></param>
  /// <param name="Author"></param>
  /// <param name="CategoryName"></param>
  /// <returns></returns>
  public static bool ValidateBook(string BookTitle, string Author, string CategoryName)
  {
  try
  {
  DataSet ds = new DataSet();
  string OleDbCommand = "select a.Lib_Book_Title,a.Lib_Book_Author_Name as 'Author',b.Category_Name from Lib_Book_Details a join Lib_Book_Categories b on b.Category_ID = a.Lib_Book_Category ";
  OleDbCommand += "join Lib_Book_Issue_Details c on c.Lib_Book_ID = a.Lib_Book_ID where c.Lib_Book_Issued_To = '" + Globals.UserName + "'";
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  Adapter.SelectCommand.Connection.Close();
  if (ds.Tables[0].Rows.Count > 0)
  {
  for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
  {
  if (ds.Tables[0].Rows[i][0].ToString().Equals(BookTitle)
  && ds.Tables[0].Rows[i][1].ToString().Equals(Author)
  && ds.Tables[0].Rows[i][2].ToString().Equals(CategoryName))
  {
  return false;

  }
  }

  }
  return true;
  }
  catch (Exception ex)
  {
  throw ex;
  }
  //return false;
  }
  /// <summary>
  /// Issue a book - set issue status as true, insert data in issue details table
  /// </summary>
  /// <param name="BookTitle"></param>
  /// <param name="Author"></param>
  /// <param name="Category"></param>
  /// <returns></returns>
  public static bool IssueBook(string BookTitle, string Author, string Category)
  {
  bool IsSuccess = false;
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "declare @bookid int\r\n";
  OleDbCommand += "select top 1 @bookid =Lib_Book_ID  from Lib_Book_Details a join Lib_Book_Categories b on b.Category_ID = a.Lib_Book_Category ";
  OleDbCommand += "where a.Lib_Book_Title = '" + BookTitle + "'and a.Lib_Book_Issue_Status = 0 and a.Lib_Book_In_Inventory = 1 and a.Lib_Book_Author_Name='" + Author + "'";
  OleDbCommand += "and b.Category_Name = '" + Category + "'\r\n";
  OleDbCommand += "insert into Lib_Book_Issue_Details (Lib_Book_ID,Lib_Book_Issued_On,Lib_Book_Issued_To) values (@bookid,getdate(),'" + Globals.UserName + "')\r\n";
  OleDbCommand += "update Lib_Book_Details set Lib_Book_Issue_Status = 1 where Lib_Book_ID = @bookid\r\n";
  OleDbCommand += "update Lib_Users set Number_Of_Books_Issued = Number_Of_Books_Issued + 1 where User_Name = '" + Globals.UserName + "'\r\n";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count != 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;
  }
  /// <summary>
  /// Return book. Update issue status to false, delete entry from issue details table
  /// </summary>
  /// <param name="BookId"></param>
  /// <param name="IssueId"></param>
  /// <returns></returns>
  public static bool ReturnBook(int BookId, int IssueId)
  {
  bool IsSuccess = false;
  try
  {
  //OleDbConnection conn = new OleDbConnection(Globals.ConnectionString);
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\SOURABH DEY\\My Documents\\Visual Studio 2008\\Projects\\Library Management System\\Library Management System\\Library.mdb;");
  conn.Open();
  OleDbCommand cmd = new OleDbCommand("", conn);
  String OleDbCommand = "BEGIN TRANSACTION\r\n";
  OleDbCommand += "update Lib_Book_Details set Lib_Book_Issue_Status=0 where Lib_Book_ID =" + BookId + "\r\n";
  OleDbCommand += "delete from Lib_Book_Issue_Details where Lib_Book_Issue_ID =" + IssueId + "\r\n";
  OleDbCommand += "update Lib_Users set Number_Of_Books_Issued = Number_Of_Books_Issued - 1 where User_Name = '" + Globals.UserName + "'\r\n";
  OleDbCommand += "Commit Transaction";
  cmd.CommandText = OleDbCommand;
  int Count = cmd.ExecuteNonQuery();
  if (Count != 1)
  {
  IsSuccess = true;
  }
  conn.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return IsSuccess;
  }
  /// <summary>
  /// Issued books data to be used in return books screen
  /// </summary>
  /// <returns></returns>
  public static DataSet PopulateReturnBooks()
  {
  DataSet ds = new DataSet();
  string OleDbCommand = "";
  OleDbCommand = "select a.Lib_Book_ID,a.Lib_Book_Issue_ID,b.Lib_Book_Title,b.Lib_Book_Author_Name,c.Category_Name from Lib_Book_Issue_Details a ";
  OleDbCommand += "join Lib_Book_Details b on a.Lib_Book_ID = b.Lib_Book_ID join Lib_Book_Categories c on b.Lib_Book_Category = c.Category_ID ";
  OleDbCommand += "where a.Lib_Book_Issued_To = '" + Globals.UserName + "'";
  try
  {
  OleDbDataAdapter Adapter = new OleDbDataAdapter(OleDbCommand, Globals.ConnectionString);
  Adapter.Fill(ds);
  //Adapter.SelectCommand.Connection.Close();
  }
  catch (Exception ex)
  {
  throw ex;
  }
  return ds;
 
  }
  }
}