error:Must declare the scalar variable "#ID" asp.net & sql server2014 - asp.net

Question

asp.net & sql server 2014 : why this error appearMust declare the scalar variable"#ID" I looked on goggle and I think it has something to do with insert parameters for ID. Then again I read there could be a typo error.
As I am not going to insert ID column manually I think this is why I am having problem(s) and I don't know how to solve this problem. i cant find out what is missing or wrong could you help please
string query = "insert into LegRent(ID, Day, Date, Name, Nationality, relegon, NatID, Name2, Nationality2, relegon2, NatID2, Type, Building, Flat, UseFor, Duration, StartFrom, EndIn, RentValue, OnlyAr, YearPercent, InsuranceValue, OnlyArInsur, Addres2, Addres) values (#ID, #Day, #Date, #Name, #Nationality, #relegon, #NatID, #Name2, #Nationality2, #relegon2, #NatID2, #Type, #Building, #Flat, #UseFor, #Duration, #StartFrom, #EndIn, #RentValue, #OnlyAr, #YearPercent, #InsuranceValue, #OnlyArInsur, #Addres2, #Addres)";
try
{
string query2 = "Select ##Identity";
int ID;
string connect = "Provider=SQLOLEDB;Data Source=.;Initial Catalog=Construction;Integrated Security=SSPI;";
using (OleDbConnection conn2 = new OleDbConnection(connect))
{
using (OleDbCommand cmd = new OleDbCommand(query, conn2))
{
cmd.Parameters.AddWithValue("#ID", idtxt.Text);
cmd.Parameters.AddWithValue("#Day", daytxt.Text);
cmd.Parameters.AddWithValue("#Date", datetxt.Text);
cmd.Parameters.AddWithValue("#Name", namedd.Text);
cmd.Parameters.AddWithValue("#Nationality", ddNati.Text);
cmd.Parameters.AddWithValue("#relegon", ddRelgon.Text);
cmd.Parameters.AddWithValue("#NatID", NatIDtxt.Text);
cmd.Parameters.AddWithValue("#Name2", namedd2.Text);
cmd.Parameters.AddWithValue("#Nationality2", ddNati2.Text);
cmd.Parameters.AddWithValue("#relegon2", ddRelgon2.Text);
cmd.Parameters.AddWithValue("#NatID2", NatIDtxt2.Text);
cmd.Parameters.AddWithValue("#Type", typrdd.Text);
cmd.Parameters.AddWithValue("#Building", buileddd.Text);
cmd.Parameters.AddWithValue("#Flat", flatdd.Text);
cmd.Parameters.AddWithValue("#UseFor", usetxt.Text);
cmd.Parameters.AddWithValue("#Duration", durationtxt.Text);
cmd.Parameters.AddWithValue("#StartFrom", starttxt.Text);
cmd.Parameters.AddWithValue("#EndIn", endtxt.Text);
cmd.Parameters.AddWithValue("#RentValue", vluetxt.Text);
cmd.Parameters.AddWithValue("#OnlyAr", onlytxt.Text);
cmd.Parameters.AddWithValue("#InsuranceValue", insurtxt.Text);
cmd.Parameters.AddWithValue("#OnlyArInsur", insuronlytxt.Text);
cmd.Parameters.AddWithValue("#YearPercent", percenttxt.Text);
cmd.Parameters.AddWithValue("#Addres2", adresstxt2.Text);
cmd.Parameters.AddWithValue("#Addres", adresstxt.Text);
conn2.Open();
cmd.ExecuteNonQuery();
cmd.CommandText = query2;
ID = (int)cmd.ExecuteScalar();
lbl_msg.Text = "تـــم الحفظ";
int rentMonths = 0;
bool isInt = int.TryParse(durationtxt.Text, out rentMonths);
if (isInt)
{
for (int index = 0; index < rentMonths; index++)
{
OleDbCommand insertRentMonths = new OleDbCommand("INSERT INTO [dbo].[AccRentReceipt] ([ReceiptID] ,[ContractID] ,[Name]) VALUES (#ReceiptID ,#ContractID ,#Name)", conn2);
cmd.Parameters.AddWithValue("#ReceiptID", index + 1);
cmd.Parameters.AddWithValue("#ContractID", ID);
cmd.Parameters.AddWithValue("#Name", namedd.Text);
}
}
}
}
}
catch (Exception ex)
{
lbl_msg.Text = "خطــــأ " + ex.Message;
}