Untitled

<!DOCTYPE html>
<html lang="en">
    <head runat="server">
    <meta charset="utf-8" />
    <title></title>
</head>

<body>
    <form id="form1" runat="server">
        <div>
            <select>
                <option value="1">M&#179;/min</option>
                <option value="2">M&#179;/s</option>
            </select>

            <asp:DropDownList ID="drp" runat="server"></asp:DropDownList>


        </div>
    </form>
</body>
</html>

public partial class MyPage: System.Web.UI.Page
{
    private class idAndUnit
    {
        public int Id { get; set; }
        public string Unit { get; set; }
    }


    protected void Page_Load(object sender, EventArgs e)
    {
        var units = new List<idAndUnit>()
        {
            new idAndUnit
            {
                Id = 1,
                Unit = "M&#179;/min"
            },
            new idAndUnit
            {
                Id = 2,
                Unit = "M&#179;/min"
            }
        };


        drp.DataSource = units;
        drp.DataTextField = "Unit";
        drp.DataValueField = "Id";
        drp.DataBind();


    }
}

<select>
    <option value="1">M&#179;/min</option>
    <option value="2">M&#179;/s</option>
 </select>

 <select name="drp" id="drp">
    <option value="1">M&#179;/min</option>
    <option value="2">M&#179;/min</option>