Change color of row according to cell Value

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            onrowdatabound="GridView1_RowDataBound">
            <Columns>
                <asp:BoundField DataField="ProductName" HeaderText="Product Name"
                    SortExpression="ProductName" />
                <asp:BoundField DataField="Quantity" HeaderText="Quantity"
                    SortExpression="Quantity" />
                <asp:BoundField DataField="CriticalLevel" HeaderText="Critical Level"
                    SortExpression="CriticalLevel" />
            </Columns>
        </asp:GridView>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {
       if (e.Row.RowType == DataControlRowType.DataRow)
       {
          DataRow pr =   ((DataRowView)e.Row.DataItem).Row;
          int id = Convert.ToInt32(pr["Quantity"]);
           if(id==1)
               e.Row.Cells[2].BorderColor = System.Drawing.Color.Red;
           if(id < 1)
               e.Row.Cells[2].BorderColor = System.Drawing.Color.Blue;
           if(id==0)
               e.Row.Cells[2].BorderColor = System.Drawing.Color.Violet;
       }
   }