请问asp.net 页面设置有关问题_ASP.NET

请教asp.net 页面设置问题
我想在form中插入背景图片，并且网页中左右边界中没有空白的，也就是网页的左右、上边界处不要有边距（如果能用表格实现也行）？先谢谢热心的大虾.

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C# code

<html><head>    <title></title>    <style>     *{margin:0;padding:0;}    .bodys    {        width:100%; height:900px; border:1px solid red;    }    </style></head><body>    <div class="bodys">        </div></body></html>
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C# code<html><head>    <title></title>    <style>     *{margin:0;padding:0;}    .bodys    {        width:100%; height:900px; border:1px solid red;    }    </style></head><body>    <div class="bodys">        </div></body></html>
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<style type="text/css">
   body  
   {  
      background-image:url(<%=backgroundImage%>);
   }
  </style>
  using System.Web.UI.HtmlControls;


   protected override void OnInit(EventArgs e)
   {
       // Define an Literal control.
       HtmlGenericControl css = new HtmlGenericControl();
       css.TagName = "style";
       css.Attributes.Add("type", "text/css");

       string imageURL = string.Empty;

       //Logic to determin imageURL goes here

       //Update Tag
       css.InnerHtml = @"body{background-image: url(" + imageURL + ");}";


       // Add the Tag to the Head section of the page.
       Page.Header.Controls.Add(css);

       base.OnInit(e);        }  

public string backgroundImage = "defaultImage.png";

或者：
<body style="background-image:url(bgr.jpg);">
...
</body>
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C# code<html><head>    <title></title>    <style>     *{margin:0;padding:0;}    .bodys    {        width:100%; height:900px; border:1px solid red;background-image:url(bgr.jpg);    }    </style></head><body>    <div class="bodys">        </div></body></html>