Vb net datagrid cellvalidating

Add(New Course With ) End Sub End Class Public Class Course Implements IEditable Object, INotify Property Changed Private _name As String Public Property Name As String Get Return _name End Get Set(By Val value As String) If _name = value Then Return _name = value On Property Changed("Name") End Set End Property Private _number As Integer Public Property Id As Integer Get Return _number End Get Set(By Val value As Integer) If _number = value Then Return _number = value On Property Changed("Id") End Set End Property Private _start Date As Date Time Public Property Start Date As Date Time Get Return _start Date End Get Set(By Val value As Date Time) If _start Date = value Then Return _start Date = value On Property Changed("Start Date") End Set End Property Private _end Date As Date Time Public Property End Date As Date Time Get Return _end Date End Get Set(By Val value As Date Time) If _end Date = value Then Return _end Date = value On Property Changed("End Date") End Set End Property #Region "IEditable Object" Private backup Copy As Course Private in Edit As Boolean Public Sub Begin Edit() Implements IEditable Object.

Property Changed Private Sub On Property Changed(By Val property Name As String) Raise Event Property Changed(Me, _ New Property Changed Event Args(property Name)) End Sub #End Region End Class Public Class Course Validation Rule Inherits Validation Rule Public Overrides Function Validate(By Val value As Object, _ By Val culture Info As System. Culture Info) _ As Validation Result Dim course As Course = _ CType(CType(value, Binding Group).

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Error Text = "" End If Next End If End Sub You can create a function that confirms there isn't a duplicated value for a specific column and call it from the the Cell Validating Event Handler. MSDN states: The Value property is the actual data object contained by the cell, whereas the Formatted Value is the formatted representation of this object. Column Index = 5 Then Dim Curr Value as string = dg.rows(e. You could also try to do this in the Cell Value Changed event. The following procedures describe how to apply validation rules to Data Grid bindings and customize the visual feedback. Cancel Edit If Not in Edit Then Return in Edit = False Me.

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