Drop down menu 下拉列表的选定索引？

如何在此功能中设置dropdownlist的选定索引

请告诉我

public IList GetMountainList()
    {
        int mountainId = 0;
        string mountainName = string.Empty;

        using (brandconnectionsEntities modelObject = new brandconnectionsEntities())
        {
            return (IList)(from s in modelObject.BC_mountainResortMediaList
                                          select new 
                                          {

                                              mountainId = s.mountainResortId,
                                              mountainName = s.mountainResortName,
                                              SelectExtensions = s.mountainResortId ,
                                          })
              .ToList();
        }
    }

谢谢

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Ritz

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