DataGridViewRowCollection.AddCopies(Int32, Int32) Method


Adds the specified number of rows to the collection based on the row at the specified index.

 virtual int AddCopies(int indexSource, int count);
public virtual int AddCopies (int indexSource, int count);
abstract member AddCopies : int * int -> int
override this.AddCopies : int * int -> int
Public Overridable Function AddCopies (indexSource As Integer, count As Integer) As Integer



The index of the row on which to base the new rows.


The number of rows to add to the DataGridViewRowCollection.



The index of the last row that was added.


indexSource is less than zero or greater than or equal to the number of rows in the control.


count is less than zero.

The associated DataGridView control is performing one of the following actions that temporarily prevents new rows from being added:

  • Selecting all cells in the control.

  • Clearing the selection.


This method is being called from a handler for one of the following DataGridView events:


The DataSource property of the DataGridView is not null.


This operation would add a frozen row after unfrozen rows.


The InheritedStyle property of the new DataGridViewRow has the same values as the InheritedStyle of the DataGridViewRow positioned at indexSource. The AddCopies method adds shared rows to the DataGridViewRowCollection, if possible. Otherwise, the new rows are unshared. For more information, see Best Practices for Scaling the Windows Forms DataGridView Control.

Rows in the control are not automatically sorted when new rows are added. To sort new rows into their correct position, call the DataGridView.Sort method in a DataGridView.RowsAdded event handler. You might also want to call the DataGridView.Sort method in a CellValueChanged event handler to sort the rows when the user modifies a cell.

Applies to

See also