vb.net - Error in saving record into MS Access database -

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i have got couple of errors in code in vb , cant figure out how solve it.

first error in following part says value cannot null parameter name: data table

da.fill(dt, "order")     con.close()

the second error in part:

 dsnewrow = ds.tables(0).newrow()

and here whole code:

private sub form1_load(byval sender system.object, byval e system.eventargs) handles mybase.load     dbprovider = "provider=microsoft.ace.oledb.12.0;"     dbsource = "data source=c:\users\pao\desktop\projecto1.accdb"     con.connectionstring = dbprovider & dbsource     con.open()     sql = "select *from order"     da = new oledb.oledbdataadapter(sql, con)     da.fill(dt, "order")     con.close() end sub  private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click      if name_.textlength > 0 , address_.textlength > 0 , key.textlength > 0         dim pizzaarr() = pizza.toarray()         dim spagarr() = spaghetti.toarray()         dim grindersarr() = grinders.toarray()         dim dsnewrow  datarow         each element string in grindersarr             msgbox(element)         next          dsnewrow = ds.tables(0).newrow()         dsnewrow.item(0) = key.text         dsnewrow.item(1) = name_.text         dsnewrow.item(2) = address_.text         ds.tables("order").rows.add(dsnewrow)         da.update(ds, "order")         msgbox("order added", msgboxstyle.information, "record")         maxrows = ds.tables("order").rows.count         ''     else         msgbox("complete form!", msgboxstyle.exclamation, "incomplete!")         exit sub     end if      '' dim cb new oledb.oledbcommandbuilder(da)     '' dim dsnewrow datarow      ''    dsnewrow = ds.tables("form").newrow()     ''  dsnewrow.item(0) = key.text     ''   dsnewrow.item(1) = name_.text     ''   dsnewrow.item(2) = address_.text      ''   ds.tables("form").rows.add(dsnewrow)      msgbox("record added", msgboxstyle.information, "record")     maxrows = ds.tables("form").rows.count   end sub


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