To create a custom validation rule, create a class that derives from the Validation Rule class and implement the Validate method.
Add the custom validation rule to the property is set to Updated Value so that the validation occurs only after the bound data object is updated.
On the architectural level you have indeed (at least) two options when it comes to validation.
Dim adapter As New Sql Data Adapter(select Command, connection String) Dim data As New Data Table() data. Storing sensitive information, such as a password, within the connection string can affect the security of your application.
When you display data entry functionality to users, you frequently have to validate the data entered into your form.
Text = "Data Grid View validation demo (disallows empty Company Name)" End Sub Private Sub Form1_Load(By Val sender As System. All Cells Except Header) End Sub Private Sub data Grid View1_Cell Validating(By Val sender As Object, _ By Val e As Data Grid View Cell Validating Event Args) _ Handles data Grid View1. Header Text ' Abort validation if cell is not in the Company Name column. Equals("Company Name") Then Return ' Confirm that the cell is not empty.
Load ' Initialize the Binding Source and bind the Data Grid View to it. Data Source = Get Data("select * from Customers") Grid View1. Auto Resize Columns( _ Data Grid View Auto Size Columns Mode.
Search for validating datagrid:
The bound entities themselves are unaware of this process.