Space in a c# wordAddIn project

[Pierre besquent]

Hi guys, I devekop a c# wordAddIn project. I want to get space BEFORE generation bookmarks.I had developed a method that adds space after generating bookmarks :

public static void CreateSimpleField (string itemName, string bookmarkName, Word.Application application)
{
object index = 1;

        if (application.Windows.get\_Item(ref index).View.ShowBookmarks == false)
            application.Windows.get\_Item(ref index).View.ShowBookmarks = true;

        Word.Selection      currentSelection = application.Selection;
        Word.Range          rng = currentSelection.Range;
        
        rng.Text = itemName;
        

        while (application.ActiveDocument.Bookmarks.Exists(bookmarkName))
        {bookmarkName += "\_";}
	    
        Object              range = rng;
        application.ActiveDocument.Bookmarks.Add (bookmarkName, ref range);
        // Ajouter un espace.
        int             indexRange = rng.End + 1;
        currentSelection.s.SetRange(indexRange, indexRange);
        currentSelection.TypeText(" ");
    }

How to transform it to get space BEFORE bookmarks? Also, when I generate, it appears like this :

[bookmarkName]

How can I remove the accolade []???? ty :)