nullable form general parameter possible?

i wish something :

myyear = record.getvalueornull<int?>("myyear"),

notice nullable form general parameter.

since getvalueornull duty relapse zero initial try this:

public stationary t getvalueornull<t>(this dbdatarecord reader, twine columnname)
  where t : class
{
    vigilant columnvalue = reader[columnname];

    (!(columnvalue dbnull))
    {
        relapse (t)columnvalue;
    }
    relapse null;
}

but blunder i'm removing is:

the form 'int?' contingency anxiety form method parameter 't' general form method

right! nullable<int> struct! i attempted changing category imprisonment struct imprisonment (and side outcome can't relapse null any more):

public stationary t getvalueornull<t>(this dbdatarecord reader, twine columnname)
  where t : struct

now assignment:

myyear = record.getvalueornull<int?>("myyear");

gives following error:

the form 'int?' contingency non-nullable value form method parameter 't' general form method

is naming nullable form general parameter during possible?