Search for a word in whole word document without opening it

Question

I want searching for a word in whole word document without opening it.

I search in every site and read all Questions here but there is an error when using this code (Using a Range Object)

object findText = "find me";

Word.Range rng = this.Paragraphs[2].Range; 

rng.Find.ClearFormatting();

if (rng.Find.Execute(ref findText,
    ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,
    ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, 
    ref missing, ref missing)) 
{ 
    MessageBox.Show("Text found.");
} 
else 
{ 
    MessageBox.Show("Text not found.");
} 

rng.Select(); 

But I have an error in

Paragraphs[2]

when open big file. The error is:

ref missing

Answer 1

You should count the paragraphs numbers in whole document using

int docc = wordfile.Paragraphs.Count;

So when you open big files, it will count all paragraphs in the file. Then using (( docc )) in the range code

Range rng = wordfile.Paragraphs[docc].Range;

Second error you can use (( Type.Missing )) instead of (( ref missing ))

so the code will be

object findText = "find me";
int docc = wordfile.Paragraphs.Count;
Range rng = wordfile.Paragraphs[docc].Range;
rng.Find.ClearFormatting();

if (rng.Find.Execute(ref findText,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, 
Type.Missing, Type.Missing)) 
 { 
  MessageBox.Show("Text found.");
 } 
else 
{ 
 MessageBox.Show("Text not found.");
} 

rng.Select();