ES-976509 - Resolve Issues in Public Syncfusion Code Examples for DataGrid XAML Controls - Phase 2

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,63 @@
-# How to serialize template column content in winui datagrid?
-This example describes how to serialize template column content in winui datagrid.
+# How to serialize template column content in WinUI DataGrid?
+
+This example describes how to serialize template column content in **WinUI DataGrid**.
+
+By default, you cannot serialize the template content in [WinUI DataGrid](https://www.syncfusion.com/winui-controls/datagrid) (SfDataGrid). This is the default behavior during Serialization and Deserialization operation.
+
+### XAML
+
+``` xml
+<Application.Resources>
+    <ResourceDictionary>
+        <ResourceDictionary.MergedDictionaries>
+            <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+            <!-- Other merged dictionaries here -->
+        </ResourceDictionary.MergedDictionaries>
+        <!-- Other app resources here -->
+        <DataTemplate x:Key="cellTemplate">
+            <Button Width="110" Content="{Binding Value}" />
+        </DataTemplate>
+    </ResourceDictionary>
+</Application.Resources>
+
+
+<dataGrid:SfDataGrid x:Name="dataGrid"
+                    AutoGenerateColumns="False"
+                    ItemsSource="{Binding Orders}">
+    <dataGrid:SfDataGrid.Columns>
+        <dataGrid:GridTemplateColumn CellTemplate="{StaticResource cellTemplate}"
+                                HeaderText="Order ID"
+                                MappingName="OrderID"
+                                SetCellBoundValue="True" />        
+    </dataGrid:SfDataGrid.Columns>
+</dataGrid:SfDataGrid>
+```
+
+If you want to serialize and deserialize the template content, you have to reconstruct the same template during deserialization in [RestoreColumnProperties](https://help.syncfusion.com/cr/winui/Syncfusion.UI.Xaml.DataGrid.Serialization.SerializationController.html#Syncfusion_UI_Xaml_DataGrid_Serialization_SerializationController_RestoreColumnProperties_Syncfusion_UI_Xaml_DataGrid_Serialization_SerializableGridColumn_Syncfusion_UI_Xaml_DataGrid_GridColumn_) method.
+
+### C#
+
+``` csharp
+this.dataGrid.SerializationController = new SerializationControllerExt(this.dataGrid);
+
+public class SerializationControllerExt : SerializationController
+{
+    public SerializationControllerExt(SfDataGrid grid)
+    : base(grid)
+    {
+
+    }
+
+    protected override void RestoreColumnProperties(SerializableGridColumn serializableColumn, GridColumn column)
+    {
+        base.RestoreColumnProperties(serializableColumn, column);
+        if (column is GridTemplateColumn)
+        {
+            if (column.MappingName == "OrderID")
+            {
+                column.CellTemplate = Application.Current.Resources["cellTemplate"] as DataTemplate;
+            }
+        }
+    }
+}
+```