请问：htmltablecell 怎样设置背景色_ASP.NET

请教：htmltablecell 怎样设置背景色？
我这样写不对：
c1.innerhtml="<img src='images/a.gif' bgcolor='#009900'>"
请问该怎样写？

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C# code

c1.BgColor = "#009900";
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       HtmlTable ht = new HtmlTable();
       HtmlTableCell tc = new HtmlTableCell();
       HtmlTableRow tr = new HtmlTableRow();
       tc.InnerHtml = "TableCell";
        tc.Style.Add("bgcolor", "#009900");
        tc.Style.Add("background-image", "images/a.gif");       
       tr.Controls.Add(tc);
       ht.Rows.Add(tr);
       ph.Controls.Add(ht);
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背景图还是色？？？

C# codeHtmlTable ht = new HtmlTable();        HtmlTableRow htr = new HtmlTableRow();        HtmlTableCell htc = new HtmlTableCell();        htc.Width = "200px";        htc.Height = "50px";        htc.InnerText = "alsdjflsdjf";        htc.BgColor = "#ff0000";        htr.Cells.Add(htc);        ht.Rows.Add(htr);        this.Controls.Add(ht);
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       tc.Style.Add("background-color", "#FF0000");
       tc.Style.Add("background-image", "images/a.gif");  


这样可以的。
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探讨

        HtmlTable ht = new HtmlTable(); 
        HtmlTableCell tc = new HtmlTableCell(); 
        HtmlTableRow tr = new HtmlTableRow(); 
        tc.InnerHtml = "TableCell"; 
        tc.Style.Add("bgcolor", "#009900"); 
        tc.Style.Add("background-image", "images/a.gif");       
        tr.Controls.Add(tc); 
        ht.Rows.Add(tr); 
        ph.Controls.Add(ht);