How to search Hidden Styles in word using VSTO in c#

Question

I am not able to search Hidden Styles in word using VSTO c#.

I have two styles "Instructions" and "Guidance" in my word document.

 

Here I used code:

public bool CheckInstructionText()
{
try
{
istoCheckInstructionsandGuidence = false;
bool ischeckforInstructions = false;
bool ischeckforGuidence = false;
Microsoft.Office.Interop.Word.Application app = Globals.ThisAddIn.Application;
Microsoft.Office.Interop.Word.Document doc1 = app.ActiveDocument;
Microsoft.Office.Interop.Word.Selection wordSelection = app.ActiveWindow.Selection;
Find fnd = doc1.Content.Find;//.Range.Find;
fnd.ClearFormatting();
fnd.Font.Hidden = 1;
fnd.Replacement.ClearFormatting();
fnd.Text = "";
fnd.Replacement.Text = "";
fnd.Forward = true;
fnd.Wrap = Microsoft.Office.Interop.Word.WdFindWrap.wdFindContinue;
fnd.Format = true;
fnd.set_Style("Instructions");
ischeckforInstructions = fnd.Execute();
fnd.ClearFormatting();
fnd.Font.Hidden = 1;
fnd.Replacement.ClearFormatting();
fnd.Text = "";
fnd.Replacement.Text = "";
fnd.Forward = true;
fnd.Wrap = Microsoft.Office.Interop.Word.WdFindWrap.wdFindContinue;
fnd.Format = true;
fnd.set_Style("Guidance");
ischeckforGuidence = fnd.Execute();
if (ischeckforInstructions || ischeckforGuidence)
{
istoCheckInstructionsandGuidence = true;
}
}
catch
{
}
return istoCheckInstructionsandGuidence;
}

Please anyone know the answer please reply me.

 

Thanks