try by making change in your controller action method
public ActionResult Index()
{
SelectionModel sel = new SelectionModel();
List<SelectionModel> lissel = new List<SelectionModel>();
byte[] imagedata;
string sql = "select filename from filestore";
OracleConnection con = new OracleConnection(ConStr);
OracleCommand com = new OracleCommand(sql, con);
try
{
con.Open();
OracleDataReader dr;
dr = com.ExecuteReader();
while (dr.Read())
{
sel.FileName = "~/Content/themes/base/images/"+dr[0].ToString();
lissel.Add(sel);
}
}
catch (Exception ex)
{
}
return View(lissel);
}
And make little bit change in view as
@foreach (var item in Model)
{
<img src="@item.FileName" />
}