Adds the specified number of rows to the collection based on the row at the specified index.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
- Type: System.Int32
The index of the row on which to base the new rows.
Return ValueType: System.Int32
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:
This method is being called from a handler for one of the following DataGridView events:
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 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.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.