From this Business World .Net components is essential for developing Web Applications.

Before creating .NET Components we need to declare a Business class.

See this example.

using System;
using System.Data;
using System.Data.SqlClient;
   
namespace BANK{
   
public class BankAccount {
   
   private string m_AccountNumber;
   
   public BankAccount () {
      m_AccountNumber=”";
   }
   
   public BankAccount (string AccountNumber) {
      m_AccountNumber = AccountNumber;
   }
   
   public string DatabaseConnection {
      set { m_AccountNumber = value; }
      get { return m_AccountNumber; }
   }
   public DataSet GetAccounts (string AccountType) {
      if (m_AccountNumber == “”)
      {
         throw new ArgumentNullException(“DatabaseConnection”,
                           “No value for the database connection string”);
      }
      SqlConnection myConnection = new SqlConnection(m_AccountNumber);
      SqlDataAdapter sqlAdapter1 = new SqlDataAdapter(
      “SELECT * FROM Accounts WHERE AccountType=’”+AccountType+”‘”, myConnection);
      DataSet Accounts = new DataSet();
      sqlAdapter1.Fill(Accounts, “Accounts”);
   
      return Accounts;
   }
   
   public DataSet GetAccountTypes () {
   
      if (m_AccountNumber == “”)
      {
         throw new ArgumentNullException(“DatabaseConnection”,
                           “No value for the database connection string”);
      }
      SqlConnection dbConnection = new SqlConnection(m_AccountNumber);
      dbConnection.Open();
   
      SqlDataAdapter sqlAdapter1 = new SqlDataAdapter(
            “SELECT DISTINCT AccountType FROM Accounts”, dbConnection);
   
      DataSet types = new DataSet();
      sqlAdapter1.Fill(types, “ProdTypes”);
   
      return types;
   }
   
 
   }
}
For Combiling this sample class,we need to type the below statement in Command Prompt.

csc /out:binBANK.dll /t:library sampleObject.cs /r:System.Data.dll
/r:System.dll /r:System.XML.dll
After we need to try this component in ours webpage

using BANK  —We accessing the Developed Component,Don,t forget to referencing BANK Component.

BANK.BankAccount  objbankAccount = new BANK.BankAccount();

Now we can utilize any methods using objbankAccount.

Cheers

Hope this helps you better

Happy Coding!