How do I have colors in drop downlist in ASP .NET

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C#

ASP.NET

I have a grid view in every row there will be dropdown list usel will select color in that , problem is how do i display colors i dont have a idea

What I have tried:

<asp:GridView ID="GridView1" runat="server" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
AutoGenerateColumns="false" >
<columns>
<asp:templatefield>
<itemtemplate>
<asp:CheckBox ID="chkRow" runat="server" onselectedindexchanged="chkRow_SelectedIndexChanged" />



<asp:TemplateField HeaderText="Country" ItemStyle-Width="150">
<itemtemplate>
<asp:Label ID="trackerid" runat="server" Text='<%# Eval("trackerid") %>'>





<asp:templatefield>
<itemtemplate>
<asp:DropDownList ID="DropDownList1" runat="server">


<asp:ListItem Text="--Select---" Value="0">
<asp:ListItem Text="red" Value="1">
<asp:ListItem Text="yellow" Value="2">
<asp:ListItem Text="green" Value="3">
<asp:ListItem Text="blue" Value="4">
<asp:ListItem Text="black" Value="5">
<asp:ListItem Text="white" Value="6">