DataGridView.RowValidating Event
.NET Framework 2.0
Note: This event is new in the .NET Framework version 2.0.
Occurs when a row is validating.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration Public Event RowValidating As DataGridViewCellCancelEventHandler 'Usage Dim instance As DataGridView Dim handler As DataGridViewCellCancelEventHandler AddHandler instance.RowValidating, handler
/** @event */ public void add_RowValidating (DataGridViewCellCancelEventHandler value) /** @event */ public void remove_RowValidating (DataGridViewCellCancelEventHandler value)
JScript supports the use of events, but not the declaration of new ones.
This event is analogous to the Validating event. Use this event to perform validation on all the values of a row. This event can be used to cancel writing row changes if the DataGridView is data-bound.
For more information about handling events, see Consuming Events.
The following code example uses RowValidating to check if valid track and release dates are entered.
Private Sub ValidateByRow(ByVal sender As Object, _ ByVal data As DataGridViewCellCancelEventArgs) _ Handles songsDataGridView.RowValidating Dim row As DataGridViewRow = _ songsDataGridView.Rows(data.RowIndex) Dim trackCell As DataGridViewCell = _ row.Cells(songsDataGridView.Columns("Track").Index) Dim dateCell As DataGridViewCell = _ row.Cells(songsDataGridView.Columns("Release Date").Index) data.Cancel = Not (IsTrackGood(trackCell) _ AndAlso IsDateGood(dateCell)) End Sub Private Function IsTrackGood(ByRef cell As DataGridViewCell) As Boolean If cell.Value.ToString().Length = 0 Then cell.ErrorText = "Please enter a track" songsDataGridView.Rows(cell.RowIndex).ErrorText = _ "Please enter a track" Return False ElseIf cell.Value.ToString().Equals("0") Then cell.ErrorText = "Zero is not a valid track" songsDataGridView.Rows(cell.RowIndex).ErrorText = _ "Zero is not a valid track" Return False ElseIf Not Integer.TryParse( _ cell.Value.ToString(), New Integer()) Then cell.ErrorText = "A Track must be a number" songsDataGridView.Rows(cell.RowIndex).ErrorText = _ "A Track must be a number" Return False End If Return True End Function Private Function IsDateGood(ByRef cell As DataGridViewCell) As Boolean If cell.Value Is Nothing Then cell.ErrorText = "Missing date" songsDataGridView.Rows(cell.RowIndex).ErrorText = _ "Missing date" Return False Else Try DateTime.Parse(cell.Value.ToString()) Catch ex As FormatException cell.ErrorText = "Invalid format" songsDataGridView.Rows(cell.RowIndex).ErrorText = _ "Invalid format" Return False End Try End If Return True End Function
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
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