Cannot have multiple items selected in a dropdownlist.

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SQL-Server

ASP.NET4

i try below code for get selected item true bydefault for dropdownlist

clsMasterBizAction objBizAction = new clsMasterBizAction();
List<clsmastervo> objMSList = new List<clsmastervo>();
objMSList = objBizAction.getMasterDetails(strTableName, strAndQuery);
ddlcity.DataSource = objMSList;
ddlcity.DataTextField = "strValue";
ddlcity.DataValueField = "intID";
ddlcity.DataBind();


if (objMSList.Count > 0)
{
var result = (from m in objMSList
select m).Take(5);

List<string> selected = new List<string>();
foreach (var item in result)
{
selected.Add(item.strValue);
}

foreach (string row in selected)
{

ddlcity.Items.FindByText(row).Selected = true;

}

}

What I have tried:

i want to selected item true in dropdownlist with top 5 city by default