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I have created a add-in for MS word. I have two buttons. Click on first move me forward by highlighting a range of words. On second button click I want to go to the previous highlighted word. Can anybody help me in second button functionality. On button click one I have this code working fine.Now how to go the previously highlighted word range on button2 click??

private void adxRibbonButton1_OnClick(object sender, IRibbonControl control, bool pressed)
 
 object missing = System.Type.Missing;
 Word.Document document = WordApp.ActiveDocument;
 foreach(Word.Range docRange in document.Words)
 
 if(docRange.HighlightColorIndex.Equals(Microsoft.Office.Interop.Word.WdColorIndex.wdRed))
 
 docRange.HighlightColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdBlue;
 docRange.Font.ColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdWhite;
 break;
 

 
 

There's more than one way to approach this:

1. Use Word's built-in Find to search backwards in the document for the first instance of the changed highlighting.



2. 
   

   Set two bookmarks, one for the current position of the code in the question and one for the previous position. The code sample below is for this variation.

   
   
   

   string CurrentBkm = "_bkmCurrent";
   string LastBkm= "_bkmLast";
   
    if(docRange.HighlightColorIndex.Equals(Microsoft.Office.Interop.Word.WdColorIndex.wdRed))
    {
    docRange.HighlightColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdBlue;
    docRange.Font.ColorIndex = Microsoft.Office.Interop.Word.WdColorIndex.wdWhite;
    if (document.Bookmarks.Exists(CurrentBkm))
    
    document.Bookmarks.Add(LastBkm, document.Bookmarks[CurrentBkm].Range.Duplicate);
    
    document.Bookmarks.Add(CurrentBkm, docRange);
    break;
   

   
   

The code for button2 simply goes to the bookmark "_bkmLast":

string LastBkm= "_bkmLast";
document.Bookmarks[LastBkm].Range.Select();

Note that the bookmark name starts with an underscore _. This hides the bookmark in the Word UI so that it won't irritate the user in case the application settings show bookmark non-printing characters.

Note, also, that the code in the question could also work with Word's built-in Find functionality to search the formatting. This would almost certainly be more efficient than "walking" each word in the document and testing its highlight formatting. If you were to change your code to use Find the solution I provide with the bookmarks would still work.