代码添加style

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请问如何在一个文档新建的时候，对文档进行style初始化。比如增加标题1，标题2，标题3，正文等常用的样式。
下面是我的代码，但是加进去报错。
ParagraphStyle ps = new ParagraphStyle("标题1", "Normal");
         ps.FontName = "宋体";
         ps.FontSize=210;
         ps.ParagraphFormat.Alignment = TXTextControl.HorizontalAlignment.Left;
         ps.ParagraphFormat.HangingIndent = 0;
         ps.ParagraphFormat.LeftIndent = 0;
         ps.ParagraphFormat.LineSpacing = 150;
         ps.ListFormat.FirstNumber = 1;
         ps.ListFormat.HangingIndent = 0;
         ps.ListFormat.LeftIndent = 0;
         ps.ListFormat.Level = 1;
         ps.ListFormat.NumberFormat = NumberFormat.ArabicNumbers;
         ps.ListFormat.RestartNumbering = false;
         ps.ListFormat.TextAfterNumber = "章";
         ps.ListFormat.TextBeforeNumber = "第";
         ps.ListFormat.Type = ListType.Numbered;
         _textControl.ParagraphStyles.Add(ps);