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Sign inDataGridView.CellValidating Event
Definition
Important
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Occurs when a cell loses input focus, enabling content validation.
public:
event System::Windows::Forms::DataGridViewCellValidatingEventHandler ^ CellValidating;C#
public event System.Windows.Forms.DataGridViewCellValidatingEventHandler CellValidating;C#
public event System.Windows.Forms.DataGridViewCellValidatingEventHandler? CellValidating;member this.CellValidating : System.Windows.Forms.DataGridViewCellValidatingEventHandler Public Custom Event CellValidating As DataGridViewCellValidatingEventHandler 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.
void VirtualConnector::dataGridView1_CellValidating
(Object^ sender, DataGridViewCellValidatingEventArgs^ e)
{
int newInteger;
// 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)
{
return;
}
if (!Int32::TryParse(e->FormattedValue->ToString(),
newInteger) || (newInteger < 0))
{
e->Cancel = true;
}
}
C#
private void dataGridView1_CellValidating(object sender,
DataGridViewCellValidatingEventArgs e)
{
dataGridView1.Rows[e.RowIndex].ErrorText = "";
int newInteger;
// 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) { return; }
if (!int.TryParse(e.FormattedValue.ToString(),
out newInteger) || newInteger < 0)
{
e.Cancel = true;
dataGridView1.Rows[e.RowIndex].ErrorText = "the value must be a non-negative integer";
}
}
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
Canceling this event cancels the changes to the current cell. 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 CellValuePushed event will not be raised.
Handle the CellValidated event to perform post-validation processing.
For more information about how to handle events, see Handling and Raising Events.
Applies to
| Product | Versions |
|---|---|
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9, 10 |