How to write the business logic codes for an application ?...

Question

@jay,

Hi ,

how to write the business logic codes for an application..i had send some sample coding...pls generate business logic codes for the code..and briefly explain that the business logic codes..

thanx....bye

karthik.k

jaya kumar · Answer

hai Karthi i given some example to handle Business logic and DataLayer. Create two class files,like BL.cs and ProductProperties.cs *to write all Business related functionality in BL.cs to write code for Login verification (Login Button Click event) protected void Login_click(object sender, EventArgs e) { // to set properties ProductProperties Obj=new ProductProperties (); Obj.UserName=TextBox1.text; Obj.Password=TextBox2.text; //to create Object for BL.cs BL ObjBL=new BL () if(ObjBL. isvalid ()) { //login sucessfully... } else { invalid username or password... } } ---------------------------------------------------------------- public class ProductProperties { private string userName,Password; public string UserName { set{userName=value;} get{return userName;} } public string Password { set{password=value;} get{return password;} } // to write like this for all needed variables.. } ---------------------------------------------------------------- public class BL { public BL() { //to establish the connection... } //to call DB using DataSet or ExecuteScalar public boolen isvalid (ProductProperties Obj) { //to validate username and password using Querystring or StoredProcedure if valid hten return true else return false here am using storedProcedure. SqlCommand cmd = new SqlCommand(); cmd.Parameters.Add("@loginID", SqlDbType.VarChar).Value = TextBox1.Text;//loginID-procedure first argument cmd.Parameters.Add("@Password", SqlDbType.VarChar).Value = TextBox2.Text;//Password-procedure second argument cmd = new SqlCommand("submitrecord", con);//submitrecord-stored procedure name cmd.CommandType = CommandType.StoredProcedure; con.Open(); isValidUser=(cmd.ExecuteScalar().Hasrow) con.Close() return (isValidUser); } // to insert any data use ExecuteNonquery method.. public int newData (ProductProperties Obj) { return(row affected or not..) } //to display all datas use Dataset. public Dataset Alldatas (ProductProperties Obj) { return (dataset); } }

Felipe Ramos · Answer

It looks like so far you could create three base object: -Customer -Supplier -Product You could further extend that by have CustomerCollection : List SuppllierCollection : List etc. You will also need your data access class CustomerDAL SupplierDAL ProductDAL example of Customer in vb since your code is on vb Option Strict On Imports Microsoft.VisualBasic Public Class Customer Private g_id As Integer = -1 Private g_name As String = String.Empty Public Sub New(ByVal ID As Integer, ByVal Name As String) g_id = ID g_name = Name End Sub Public ReadOnly Property ID() As Integer Get Return g_id End Get End Property Public Property Name() As String Get Return g_name End Get Set(ByVal value As String) g_name = value End Set End Property Public Shared Function Load(ByVal CustomerID As Integer) As Customer Dim result As System.Data.DataSet = CustomerDAL.GetCustomer(CustomerID) Return New Customer(CInt(result.Tables(0).Rows(0)("ID")), result.Tables(0).Rows(0)("Name").ToString()) End Function End Class Friend Class CustomerDAL Public Shared Function GetCustomer(ByVal CustomerID As Integer) As System.Data.DataSet Return Nothing End Function End Class

Karthik K · Answer

Thanks Gentleman !..I helped me ..

Karthik K · Answer

Thanks lot for you Code !.. By karthik.k