I am using word VSTO addins.
 
I created the Custom Numbered Heading Styles in word. After applying the Heading style to 1st paragraph, If I use Redo(CTR+Y) to next paragraph it is not working.
 
Here is my code.
 
 public void NumHeading1(Office.IRibbonControl control)
 {
 try
 {
 Microsoft.Office.Interop.Word.Application app = Globals.ThisAddIn.Application;
 Microsoft.Office.Interop.Word.Document doc1 = app.ActiveDocument;
 Selection wordSelection = Globals.ThisAddIn.Application.Selection;
 wordSelection.Paragraphs.set_Style(WdBuiltinStyle.wdStyleHeading1);
 }
 catch (Exception ex)
 {
 throw;
 }
 }
 
 
Please anyone can help me in this.