Как получить данные для отображения в формате csv с использованием месяца и года из базы данных datbaseatabase

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использование (SqlDataAdapter sda = new SqlDataAdapter())
{
УМК.Подключение = кон;
АСД.Команды selectcommand = ЦМД;
using (DataTable dt = new DataTable())
{
ПДД.Заполнить(ДТ);

Что я уже пробовал:

double Month = Convert.ToDouble(DropDownList1.SelectedItem.Value);
     double Year = Convert.ToDouble(DropDownList2.SelectedItem.Value);
     string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
     using (SqlConnection con = new SqlConnection(constr))
     {
         using (SqlCommand cmd = new SqlCommand("SELECT a.FirstName +' '+ a.MiddleName +' '+a.LastName as ApplicantName,a.ApplicationNo,b.[ApplicationDate] FROM [Applicant]as a,Application as b where a.ApplicationNo= b.ApplicationNo and MONTH(b.ApplicationDate) = @Month and YEAR(b.ApplicationDate) = @Year "))
         //using (SqlCommand cmd = new SqlCommand("SELECT a.FirstName +' '+ a.MiddleName +' '+a.LastName as ApplicantName,a.ApplicationNo,b.[ApplicationDate] FROM [Applicant]as a,Application as b where a.ApplicationNo= b.ApplicationNo and YEAR(b.ApplicationDate) = @Year "))
         {
             SqlParameter param = new SqlParameter();
             param.ParameterName = "@Month";
             param.Value = Month;

             cmd.Parameters.Add(param);
             //SqlParameter param = new SqlParameter();
              param.ParameterName = "@Year";
              param.Value = Year;
             cmd.Parameters.Add(param);

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