How the check that I'm editing specific page Interop.Word

Question

In my app I'm editing a word document, I want to modify some values but I want the changes to affect the first page, only:

The content of the first page is like:

USER:
COMPANY:

and I want to modify it to:

USER: aaa
COMPANY: bbb

I have tried like:

//properties
object objMiss = System.Reflection.Missing.Value;
object objEndOfDocFlag = "\\endofdoc"; /* \endofdoc is a predefined bookmark */ //Start Word and create a new document.
Microsoft.Office.Interop.Word._Application objApp;
Microsoft.Office.Interop.Word._Document objDoc;



//load the document:
 objDoc = objApp.Documents.Open(@"C:\Users\BugsFixer\file.docx", ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss, ref objMiss);

int count = objDoc.Words.Count;
for (int i = 1; i <= count; i++)
{                   
    string text = objDoc.Words[i].Text;
    if (text.StartsWith("USER"))
         objDoc.Words[i].Text = "USER: aaa";
    if (text.StartsWith("COMPANY"))
         objDoc.Words[i].Text = "COMPANY: bbb";                  
 }

but this woud change all "USER" strings. I need something like:

if(current page is one)
{
//replace USER with USER:aaa
//replace COMPANY with COMPANY:bbb
}

How to check that I'm editing a specific page i.e in my case page 1?

Answer 1

Word has an interesting method: get_Information which takes an argument of the enumeration Word.WdInformation. There are a number of useful things this can return, among them, the current page number of a selection or Range.

Since the Word object returns a Range it's possible to query the page number something like this:

Word.Range rngWord = objDoc.Words[i];
string text = rngWord.Text;
int pgNumber = rngWord.get_Information(Word.WdInformation.wdActiveEndPageNumber);
if (pgNumber = 1)
{
      if (text.StartsWith("USER"))
      { //and so on

Note that it's also possible to use foreach with the Words collection instead of getting the count of Words in the document and using a for loop.

All that being said, the code would probably be more efficient if it used Word's Find functionality instead of looping word-by-word...