handling dbnull information vb.net


i wish beget formatted cost information retrieved an ms-access database stored datatable object/variable, mydatatable. however, fields mydatatable cotain dbnull data. so, following vb.net formula dash give errors value any fields lastname, intials, sid dbnull.



   low mydatatable datatable
   low tmpstr string
   low sid integer = 1

   ...
   mydatatable = mytableadapter.getdata() ' reads information ms-access table
   ...

   any myitem datarow mydatatable.rows

    tmpstr = nameitem("lastname") + " " + nameitem("initials")

    myitem("sid")=sid then
        ' something
    finish if

    ' imitation tmpstr

   next


so, i above formula work fields competence enclose dbnull but carrying check any information dbnull ?



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