How do I...add css in code behine

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CSS

hi this is part of my code

if (e.Row.RowType == DataControlRowType.DataRow)
           {
               HiddenField rowType = (HiddenField)e.Row.FindControl("RowType");
               if (rowType != null)
               {
                   switch (rowType.Value)
                   {
                       case "2":
                           ((HyperLink)(e.Row.FindControl("FactorName"))).NavigateUrl = "http://www.google.com";
                           ((HyperLink)(e.Row.FindControl("FactorName"))).Font.Bold = true;
                           break;
                       case "3":
                           ignoreRow = true;
                           try
                           {
                               ((Label)(e.Row.FindControl("VAL1"))).Text = "";
                           }
                           catch { }
                           break;
                       case "4":
                   grdSAS.Rows[e.Row.RowIndex - 1].Attributes.Add("style", "Background-color:#ccc");


                   //do summerize;
                   break;
                   }

               }
           }
       }

in part
grdSAS.Rows[e.Row.RowIndex - 1].Attributes.Add("style", "Background-color:#ccc"); i need to add css
i add
.Attributes.Add("style", "Background-color:#ccc");
but have error
pleas help me to solve this problem