DataGridViewRowsAddedEventArgs Class


Provides data for the RowsAdded event.

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


public class DataGridViewRowsAddedEventArgs : EventArgs

System_CAPS_pubmethodDataGridViewRowsAddedEventArgs(Int32, Int32)

Initializes a new instance of the DataGridViewRowsAddedEventArgs class.


Gets the number of rows that have been added.


Gets the index of the first added row.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

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 NIB: 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.

bool newRowNeeded;
private void dataGridView1_NewRowNeeded(object sender,
    DataGridViewRowEventArgs e)
    newRowNeeded = true;

const int initialSize = 5000000;
int numberOfRows = initialSize;

private void dataGridView1_RowsAdded(object sender,
     DataGridViewRowsAddedEventArgs e)
    if (newRowNeeded)
        newRowNeeded = false;
        numberOfRows = numberOfRows + 1;

#region "data store maintance"
const int initialValue = -1;

private void dataGridView1_CellValueNeeded(object sender,
    DataGridViewCellValueEventArgs e)
    if (store.ContainsKey(e.RowIndex))
        // Use the store if the e value has been modified 
        // and stored.            
        e.Value = store[e.RowIndex];
    else if (newRowNeeded && e.RowIndex == numberOfRows)
        if (dataGridView1.IsCurrentCellInEditMode)
            e.Value = initialValue;
            // Show a blank value if the cursor is just resting
            // on the last row.
            e.Value = String.Empty;
        e.Value = e.RowIndex;

private void dataGridView1_CellValuePushed(object sender,
    DataGridViewCellValueEventArgs e)
    store.Add(e.RowIndex, int.Parse(e.Value.ToString()));

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

.NET Framework
Available since 2.0

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

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