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

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,86 @@
-# How to drag and drop rows between two wpf datagrids?
-This example illustrates how to drag and drop rows between two wpf datagrids
+# How to drag and drop rows between two wpf datagrids
+
+This example illustrates how to drag and drop rows between two [WPF DataGrid](https://www.syncfusion.com/wpf-controls/treegrid).
+
+To perform the dragging operation between two datagrid by using the [GridRowDragDropController.DragStart](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_DragStart), [GridRowDragDropController.Drop](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_Drop), [GridRowDragDropController.DragOver](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_DragOver) and [GridRowDragDropController.Dropped](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.GridRowDragDropController.html#Syncfusion_UI_Xaml_Grid_GridRowDragDropController_Dropped) events.
+
+``` c#
+this.firstDataGrid.RowDragDropController.DragStart += sfGrid_DragStart;
+this.firstDataGrid.RowDragDropController.Drop += sfGrid_Drop;
+this.firstDataGrid.RowDragDropController.Dropped += sfGrid_Dropped;
+this.secondDataGrid.RowDragDropController.DragOver += grid_DragOver;
+
+/// <summary>
+/// customize the DragStart event.Restrict the certain record from dragging.
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void sfGrid_DragStart(object sender, GridRowDragStartEventArgs e)
+{
+    var record = e.DraggingRecords[0] as OrderInfo;
+    if (record.CustomerName == "Martin")
+    {
+        e.Handled = true;
+    }
+}
+
+/// <summary>
+/// Customize the DragOver event.Disable the DragUI
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void grid_DragOver(object sender, GridRowDragOverEventArgs e)
+{
+    e.ShowDragUI = false;
+    e.Handled = true;
+}
+
+
+/// <summary>
+/// Customize the Drop event
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void sfGrid_Drop(object sender,GridRowDropEventArgs e)
+{
+    var record = e.DraggingRecords[0] as OrderInfo;
+    var dropPosition = e.DropPosition.ToString();
+    if (dropPosition == "DropAbove")
+    {
+        e.Handled = true;
+    }
+    if (record.ShipCity == "Mexico D.F.")
+    {
+        e.Handled = true;
+    }
+}
+
+/// <summary>
+/// Customize the Dropped event.
+/// </summary>
+/// <param name="sender"></param>
+/// <param name="e"></param>
+private void sfGrid_Dropped(object sender, GridRowDroppedEventArgs e)
+{
+    ObservableCollection<object> draggingRecords = new ObservableCollection<object>();
+
+    draggingRecords = e.Data.GetData("Records") as ObservableCollection<object>;
+            
+    var items = draggingRecords[0] as OrderInfo;
+
+    var records = AssociatedObject.firstDataGrid.View.Records.ToList();
+            
+    IList collection = AssociatedObject.firstDataGrid.ItemsSource as IList;
+            
+    for (int i = 0; i < records.Count; i++)
+    {       
+        var orderData = records[i].Data as OrderInfo;
+        if (orderData.OrderID == items.OrderID)
+        {
+            collection.Remove(items);
+            collection.Insert(i, orderData);
+        }      
+    }
+    AssociatedObject.firstDataGrid.ItemsSource = collection;
+}
+```