How to show rating images in gridview

HI friends,

I want to show that rating images in my gridview

I have scheme_Name & Rating colunms in my gridviwe i want to display rating images(e.g. *)  in my gridview

i am not storing any images in my database  (in my database rating column have value such as 1,2.3) so accordding this i want to display rating images in  gridview my code is given below

sheme_rating.aspx

 
 
  Scheme Name
 
  <%#DataBinder.Eval(Container.DataItem, "S_Name").ToString()%>
 
 
 
 
 
  Rating
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

sheme_rating.aspx.cs
protected void gwdSearchRating_RowDataBound(object sender, GridViewRowEventArgs e)
  {
  Label lblrating = (Label)gwdSearchRating.FindControl("lbl_rating");
  Image img = (Image)gwdSearchRating.FindControl("img_rating");
  if (e.Row.RowType == DataControlRowType.DataRow)
  {
 

  int rating = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "rating"));
  for (int i = 0; i < rating; i++)
  {
  string imgcontrol = "";
  }

  }
  }

from above coding i got rating in this manner 1*,2*,3*
but i want rating *,**, *** in this manner 


plz help me how to do this
thanx