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DataGridViewCellValidatingEventHandler Delegate

Note: This delegate is new in the .NET Framework version 2.0.

Represents the method that will handle the CellValidating event of a DataGridView control.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public delegate void DataGridViewCellValidatingEventHandler (
	Object sender,
	DataGridViewCellValidatingEventArgs e
)
/** @delegate */
public delegate void DataGridViewCellValidatingEventHandler (
	Object sender, 
	DataGridViewCellValidatingEventArgs e
)
JScript supports the use of delegates, but not the declaration of new ones.

Parameters

sender

A reference to the event sender.

e

A DataGridViewCellValidatingEventArgs that contains the event data.

The CellValidating event occurs when a cell loses input focus, enabling content validation. 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.

When you create a DataGridViewCellValidatingEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

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 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 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

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.

.NET Framework

Supported in: 2.0

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