Linq query paramter pass in if check

first i create static function

public static string Jqufunc(int yearP,DropDownList yearValue )
       {

var re = (from stdtable in a.Std_info
                    join catg in a.Catg_type on stdtable.Catg_id equals catg.Catg_id
                    join prog in a.Program_type on stdtable.Prog_id equals prog.Prog_id
                    join yea in a.Year_info on stdtable.year_id equals yea.year_id
                    where (yea.year == yearP)
                    group stdtable by new {catg.Catg_type1, prog.Prog_name, yea.year, stdtable.Catg_id}
                    into g
                    select new
                    {
                        Catg_type1 = g.Key.Catg_type1,
                        Prog_name = g.Key.Prog_name,
                        year = g.Key.year,
                        Catg_id = g.Key.Catg_id,
                       // total_students = g.Count(),
                       total_students = g.Select(p => p.Catg_id).Distinct().Count()
                    });
                if (Convert.ToInt32(yearValue.SelectedValue)!=0)
                {
                    re = re.Where(yea => Convert.ToInt32(yearP)(yearValue.SelectedValue));
                    
                }

but this shows error Method name expected in this line  re = re.Where(yea => Convert.ToInt32(yearP)(yearValue.SelectedValue));