how to check duplicate repeated date in elseif condition

@foreach (var dat in Model.presentda)

{

Itemin sfdsf = new Itemin();

sfdsf.show_dates = dat;

@*@Html.Raw(@dat)*@

@*Date :@dat.dates<
*@

foreach (var dat2 in Model.dates)

{

Itemin item = new Itemin();

item.show_dates = dat2;

@*@Html.Raw(@dat2)*@

int result = DateTime.Compare( DateTime.Parse(dat2), DateTime.Parse(dat));

if (result == -1)

{

@dat

}

else if (result == 0)

{

@dat

}

else if (result > 0)                   ///////////////////////////// here i am checking dates if condition is coming                                                                                   this loop iam displaying lable but same date is comparing with all date with other model so evryy time lable is creatd for same  date. i want to display only one time for lable for unique date how?

{

@dat

} @*Date :@dat.dates<
*@

}

}