DataGridViewRowsAddedEventArgs Class

Provides data for the RowsAdded event.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

Public Class DataGridViewRowsAddedEventArgs
	Inherits EventArgs
Dim instance As DataGridViewRowsAddedEventArgs

public class DataGridViewRowsAddedEventArgs extends EventArgs
public class DataGridViewRowsAddedEventArgs extends EventArgs
Not applicable.

The RowsAdded event occurs when rows are added to a DataGridView control. When the user adds a new row using the row for new records, the RowIndex value in the handler for this event is equal to the index of the new location of the row for new records, which is one greater than the row just added. When you add rows programmatically, however, the RowIndex value is the index of the first row added.

For more information about handling events, see Consuming Events.

The following code example handles the RowsAdded event to increment the number of rows in a virtual DataGridView. The number of rows is used in the CellValueNeeded handler so it knows when to show a blank cell versus an initialized cell for a new row. This example is part of a larger example available in the VirtualMode reference topic.

    Dim newRowNeeded As Boolean

    Private Sub dataGridView1_NewRowNeeded(ByVal sender As Object, _
        ByVal e As DataGridViewRowEventArgs) _
        Handles dataGridView1.NewRowNeeded

        newRowNeeded = True
    End Sub

    Const initialSize As Integer = 5000000
    Dim numberOfRows As Integer = initialSize

    Private Sub dataGridView1_RowsAdded(ByVal sender As Object, _
        ByVal e As DataGridViewRowsAddedEventArgs) _
        Handles dataGridView1.RowsAdded

        If newRowNeeded Then
            newRowNeeded = False
            numberOfRows = numberOfRows + 1
        End If
    End Sub

#Region "data store maintance"
    Const initialValue As Integer = -1

    Private Sub dataGridView1_CellValueNeeded(ByVal sender As Object, _
        ByVal e As DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValueNeeded

        If store.ContainsKey(e.RowIndex) Then
            ' Use the store if the e value has been modified 
            ' and stored.
            e.Value = store(e.RowIndex)
        ElseIf newRowNeeded AndAlso e.RowIndex = numberOfRows Then
            If dataGridView1.IsCurrentCellInEditMode Then
                e.Value = initialValue
                ' Show a blank value if the cursor is just resting
                ' on the last row.
                e.Value = String.Empty
            End If
            e.Value = e.RowIndex
        End If
    End Sub

    Private Sub dataGridView1_CellValuePushed(ByVal sender As Object, _
        ByVal e As DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValuePushed

        store.Add(e.RowIndex, CInt(e.Value))

    End Sub
#End Region

    Dim store As System.Collections.Generic.Dictionary(Of Integer, Integer) = _
        New Dictionary(Of Integer, Integer)

private boolean newRowNeeded;

private void dataGridView1_NewRowNeeded(Object sender,
    DataGridViewRowEventArgs e)
    newRowNeeded = true;
} //dataGridView1_NewRowNeeded

private final int INITIALSIZE = 5000000;
private int numberOfRows = INITIALSIZE;

private void dataGridView1_RowsAdded(Object sender,
    DataGridViewRowsAddedEventArgs e)
    if (newRowNeeded) {
        newRowNeeded = false;
        numberOfRows = numberOfRows + 1;
} //dataGridView1_RowsAdded

#region "data store maintance"
private final int INITIALVALUE = -1;

private void dataGridView1_CellValueNeeded(Object sender,
    DataGridViewCellValueEventArgs e)
    if (store.ContainsKey(e.get_RowIndex())) {
        // Use the store if the e value has been modified 
        // and stored.            
    else {
        if (newRowNeeded && e.get_RowIndex() == numberOfRows) {
            if (dataGridView1.get_IsCurrentCellInEditMode()) {
            else {
                // Show a blank e if the cursor is just loitering
                // over(the)
                // last row.
        else {
} //dataGridView1_CellValueNeeded

private void dataGridView1_CellValuePushed(Object sender,
    DataGridViewCellValueEventArgs e)
    store.Add(e.get_RowIndex(), Int32.Parse(e.get_Value().ToString()));
} //dataGridView1_CellValuePushed

private Dictionary<int, int> store = new Dictionary<int, int>();


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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