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

Author: SreemonPremkumarM

README.md

@@ -1,2 +1,70 @@
-# How to print specific pages in uwp datagrid?
-This example describes how to print specific pages in uwp datagrid
+# How to print specific pages in UWP DataGrid
+
+This example describes how to print specific pages in [UWP DataGrid](https://www.syncfusion.com/uwp-ui-controls/datagrid) (SfDataGrid).
+
+You can print the specific pages by overriding [OnAddPrintPages](https://help.syncfusion.com/cr/uwp/Syncfusion.UI.Xaml.Grid.PrintManagerBase.html#Syncfusion_UI_Xaml_Grid_PrintManagerBase_OnAddPrintPages_Windows_UI_Xaml_Printing_AddPagesEventArgs_) method in `PrintManagerBase` class.
+
+``` csharp
+public class CustomPrintManager : GridPrintManager
+{
+    
+    public CustomPrintManager(SfDataGrid grid)
+        : base(grid)
+    {
+
+    }
+
+    protected override void OnAddPrintPages(AddPagesEventArgs e)
+    {
+        IList<Windows.Graphics.Printing.PrintPageRange> customPageRanges = e.PrintTaskOptions.CustomPageRanges;           
+        
+		int pageCount = this.PageDictionary.Count;
+        
+        // An empty CustomPageRanges means "All Pages"
+        if (customPageRanges.Count == 0)
+        {
+            // Loop over all of the preview pages and add each one to be printed
+            for (var i = 1; i <= pageCount; i++)
+            {
+                var printpageControl = CreatePage(i);
+                PrintDocument.AddPage(printpageControl);
+            }
+        }
+        else
+        {
+            // Print only the pages chosen by the user.
+            // 
+            // The "Current page" option is a special case of "Custom set of pages".
+            // In case the user selects the "Current page" option, the PrintDialog
+            // will turn that into a CustomPageRanges containing the page that the user was looking at.
+            // If the user typed in an indefinite range such as "6-", the LastPageNumber value
+            // will be whatever this sample app last passed into the PrintDocument.SetPreviewPageCount API.
+            foreach (PrintPageRange pageRange in customPageRanges)
+            {
+                // The user may type in a page number that is not present in the document.
+                // In this case, we just ignore those pages, hence the checks
+                // (pageRange.FirstPageNumber <= printPreviewPages.Count) and (i <= printPreviewPages.Count).
+                //
+                // If the user types the same page multiple times, it will be printed multiple times
+                // (e.g 3-4;1;1 will print pages 3 and 4 followed by two copies of page 1)
+                if (pageRange.FirstPageNumber <= pageCount)
+                {
+                    for (int i = pageRange.FirstPageNumber; (i <= pageRange.LastPageNumber) && (i <= pageCount); i++)
+                    {
+                        // Subtract 1 because page numbers are 1-based, but our list is 0-based.
+                        var printpageControl = CreatePage(i);
+                        PrintDocument.AddPage(printpageControl);
+                    }
+                }
+            }
+        }
+        // Indicate that all of the print pages have been provided.
+        PrintDocument.AddPagesComplete();
+    }
+}
+```
+
+``` csharp
+dataGrid.PrintSettings.PrintManagerBase = new CustomPrintManager(this.dataGrid);
+dataGrid.PrintSettings.PrintManagerBase.Print();
+```