I am writing a piece of c# code which use Nhibernate to do a query. It require to do a not equal expression, I tried to use Nhibernate.Expression, but it dosen't work, please help! Thanks!

public static Deal_Model[] FindSearchDeal(string dealId,string dealName,string from,string to)
{

//get number of criterias
int count=0;
if(dealId!=null)
count++;
if(dealName!=null&&dealName!="")
count++;
if((from!=null&&from!="")||(to!=null&&to!=""))
count++;

int countObj=0;
if(count>0)
{
NHibernate.Expression.ICriterion[] expObj;
expObj =new NHibernate.Expression.ICriterion[count];
//how to make an not equal to expression?
/* if(dealId!=null&&dealId!="")
{
expObj[countObj]=Expression.NotEqual("Id", dealId); //that dosen't work
countObj++;
}*/


if(dealName!=null&&dealName!="")
{
expObj[countObj]=Expression.Eq("Name", dealName);
countObj++;
}

if(from!=null&&from!=""||to!=null&&to!="")
{
if(from!=null&&from!=""&&to!=null&&to!="")
{
expObj[countObj]=Expression.Between("Prospectus_date",from,to);
countObj++;
}
else
{
if(from!=null&&from!="")
expObj[countObj]=Expression.Eq("Prospectus_date",from);
else
expObj[countObj]=Expression.Eq("Prospectus_date",to);
}
}

return (Deal_Model[]) FindAll( typeof(Deal_Model),expObj);
}
else
{
return (Deal_Model[]) FindAll( typeof(Deal_Model),Expression.Eq("Historical", 0));
}



}

Perhaps the following will help: