ASP.NET Drop down list and strongly typed DataTable

I had code where I populate the contents of an ASP.NET DropDownList with a strongly typed DataTable returned from an ASP.NET web service. In this code I bound the DataTable to the DataSource of the DropDownList and did a DataBind() in the Page_Load() method. This worked perfectly fine on my local box.

However, when I loaded up the ASP.NET page in the production data center, I got:

System.Web.HttpException: A
DropDownList cannot have multiple items selected

To solve this problem, after I bound the DataTable to the DropDownList, I iterated through each ListItem and set its Selected property to false:

foreach (ListItem myItem in myDropDownList)
{
myItem.Selected = false;
}