Fixed textarea pre-value issue

Author: yukozh

src/YuukoBlog/Views/Default/Shared/Post.cshtml

@@ -41,7 +41,7 @@
                     </p>
                     <p>
                         <div class="markdown-textbox-outer">
-                            <textarea id="txtContent" class="markdown-textbox" name="Content" placeholder="Markdown here..."></textarea>
+                            <textarea id="txtContent" class="markdown-textbox" name="Content" placeholder="Markdown here...">@(new HtmlString(Model.Content))</textarea>
                             <div class="markdown-textbox-bottom">拖拽文件、粘贴文件或<a href="javascript:uploadAttachment();">选择文件</a>以添加附件。</div>
                         </div>                    
                     </p>

src/YuukoBlog/Views/Moon/Shared/Post.cshtml

@@ -49,7 +49,7 @@
                 </p>
                 <p>
                     <div class="markdown-textbox-outer">
-                        <textarea id="txtContent" class="markdown-textbox" name="Content" placeholder="Markdown here..."></textarea>
+                        <textarea id="txtContent" class="markdown-textbox" name="Content" placeholder="Markdown here...">@(new HtmlString(Model.Content))</textarea>
                         <div class="markdown-textbox-bottom">拖拽文件、粘贴文件或<a href="javascript:uploadAttachment();">选择文件</a>以添加附件。</div>
                     </div>
                 </p>