Should this validation be done in the business layer or in the middleware component of a multi-layer application?
Some checks are business rules and thus conceptually they must be done in the business layer of the multi-layer application or in the server-side of a client/server application.
Virtual mode gives you a higher degree of control by allowing you to wait until a cell is actually being displayed to provide the value it will contain. Sql Client Public Class Form1 Dim s Command As Sql Command Dim s Adapter As Sql Data Adapter Dim s Builder As Sql Command Builder Dim s Ds As Data Set Dim s Table As Data Table Private Sub load_btn_Click(By Val sender As System. Open() s Command = New Sql Command(sql, connection) s Adapter = New Sql Data Adapter(s Command) s Builder = New Sql Command Builder(s Adapter) s Ds = New Data Set() s Adapter.
The following source code illustrate how to connect a Data Grid View to a database and addnew/update or delete the database values from Data Grid View.
This eliminates the possibility the end-users will incorrectly enter the values.
The refining of the data is done later, when the data is passed to another layer for processing.
Position) End If Public Class Form1 Private row Index As Integer = 0 Private Sub Form1_Load(By Val sender As System.
It includes a powerful set of libraries called the .
Full Row Select End Sub Private Sub new_btn_Click(By Val sender As System.
Click Data Grid View1.[Read Only] = False save_btn.
Position) End If End Sub Private Sub Context Menu Strip1_Click(By Val sender As System.
The Data Grid View control can display rows of data from a data source.