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DataGridViewDataErrorEventHandler Delegate

Represents the method that will handle the DataError event of a DataGridView.

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

public delegate void DataGridViewDataErrorEventHandler (
	Object sender,
	DataGridViewDataErrorEventArgs e
)
/** @delegate */
public delegate void DataGridViewDataErrorEventHandler (
	Object sender, 
	DataGridViewDataErrorEventArgs e
)
Not applicable.

Parameters

sender

The source of the event.

e

A DataGridViewDataErrorEventArgs that contains the event data.

The DataError event is raised when an error occurs during a data processing operation in a data-bound DataGridView (for example, when a format or parse operation throws an exception or the update of the data source fails).

When you create a DataGridViewDataErrorEventHandler 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 demonstrates how to use a DataGridViewDataErrorEventHandler to display information about a DataError in a message box. This code is part of a larger example provided in the DataGridViewComboBoxColumn class overview topic.

private void DataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs anError)
{

    MessageBox.Show("Error happened " + anError.Context.ToString());

    if (anError.Context == DataGridViewDataErrorContexts.Commit)
    {
        MessageBox.Show("Commit error");
    }
    if (anError.Context == DataGridViewDataErrorContexts.CurrentCellChange)
    {
        MessageBox.Show("Cell change");
    }
    if (anError.Context == DataGridViewDataErrorContexts.Parsing)
    {
        MessageBox.Show("parsing error");
    }
    if (anError.Context == DataGridViewDataErrorContexts.LeaveControl)
    {
        MessageBox.Show("leave control error");
    }

    if ((anError.Exception) is ConstraintException)
    {
        DataGridView view = (DataGridView)sender;
        view.Rows[anError.RowIndex].ErrorText = "an error";
        view.Rows[anError.RowIndex].Cells[anError.ColumnIndex].ErrorText = "an error";

        anError.ThrowException = false;
    }
}

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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