Merge pull request #2 from SyncfusionExamples/ES-975464

ES-975464 - Resolve the ReadMe file length issue in this sample repository

Author: vijayarasan

README.md

@@ -1,2 +1,27 @@
-# how_to_discard_all_changes
-This sample explains how to undo and redo all the unsaved changes in Spreadsheet
+# How to Discard all the Changes in WPF Spreadsheet?
+
+This sample explains how to undo and redo all the unsaved changes in [WPF Spreadsheet](https://www.syncfusion.com/wpf-controls/spreadsheet) (SfSpreadsheet).
+
+By default, all the unsaved changes are maintained in the **UndoStack** commands collection.  To discard all the unsaved changes programmatically, **Execute** the all commands in **UndoStack** collection. By executing the commands in **RedoStack** commands collection, all the discarded changes can be retrieved.
+
+``` c#
+//UndoAll the changes
+while (this.spreadsheetControl.HistoryManager.UndoStack.Count > 0) 
+{ 
+   var undo = this.spreadsheetControl.HistoryManager.UndoStack.Pop(); 
+   if (undo != null) 
+   { 
+        undo.Execute(Syncfusion.UI.Xaml.Spreadsheet.History.CommandMode.Undo); 
+   } 
+}
+ 
+//RedoAll the changes
+while (this.spreadsheetControl.HistoryManager.RedoStack.Count > 0) 
+{ 
+    var redo = this.spreadsheetControl.HistoryManager.RedoStack.Pop(); 
+    if (redo != null) 
+    {
+        redo.Execute(Syncfusion.UI.Xaml.Spreadsheet.History.CommandMode.Redo); 
+    }
+}
+```