Returns a value indicating whether all the DataGridView cells are currently selected.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Return ValueType: System.Boolean
true if all cells (or all visible cells) are selected or if there are no cells (or no visible cells); otherwise, false.
The SelectedCells collection does not perform efficiently with large selections. To determine whether all the cells in the DataGridView have been selected before you access the contents of the SelectedCells collection, check the return value of the method. However, this method can cause rows to become unshared. For more information about DataGridView performance, see Best Practices for Scaling the Windows Forms DataGridView Control.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.