DataGridViewCellValidatingEventArgs Class
Assembly: System.Windows.Forms (in system.windows.forms.dll)
The DataGridView.CellValidating event lets you cancel changes to the current cell when the new value is not valid. Use the FormattedValue property to determine the current value. To determine the state of the current cell, use the RowIndex and ColumnIndex properties to access the cell through the DataGridView.Rows collection. To cancel the change, set the Cancel property to true.
When this event is canceled in data-bound mode, the new value is not pushed to the underlying data source. When this event is canceled in virtual mode, the DataGridView.CellValuePushed event will not be raised.
The following code example handles the CellValidating event to ensure that only positive integers are entered by the user. This example is part of a larger example available in the VirtualMode reference topic.
Private Sub dataGridView1_CellValidating(ByVal sender As Object, _ ByVal e _ As DataGridViewCellValidatingEventArgs) _ Handles dataGridView1.CellValidating Me.dataGridView1.Rows(e.RowIndex).ErrorText = "" Dim newInteger As Integer ' Don't try to validate the 'new row' until finished ' editing since there ' is not any point in validating its initial value. If dataGridView1.Rows(e.RowIndex).IsNewRow Then Return If Not Integer.TryParse(e.FormattedValue.ToString(), newInteger) _ OrElse newInteger < 0 Then e.Cancel = True Me.dataGridView1.Rows(e.RowIndex).ErrorText = "the value must be a non-negative integer" End If End Sub
private void dataGridView1_CellValidating(Object sender,
DataGridViewCellValidatingEventArgs e)
{
int newInteger = 0;
// Don't try to validate the 'new row' until finished
// editing since there
// is not any point in validating its initial value.
if (dataGridView1.get_Rows().get_Item(
e.get_RowIndex()).get_IsNewRow()) {
return;
}
if (!(Int32.TryParse(e.get_FormattedValue().ToString(), newInteger))
|| newInteger < 0) {
e.set_Cancel(true);
}
} //dataGridView1_CellValidating
System.EventArgs
System.ComponentModel.CancelEventArgs
System.Windows.Forms.DataGridViewCellValidatingEventArgs
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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.
Reference
DataGridViewCellValidatingEventArgs MembersSystem.Windows.Forms Namespace
DataGridView Class
DataGridView.CellValidating Event
DataGridView.CellValidated Event
DataGridView.CellValuePushed Event
DataGridView.OnCellValidating
DataGridViewCell Class
DataGridViewCellValidatingEventHandler
FormattedValue
RowIndex
ColumnIndex
CancelEventArgs.Cancel