Procedure or function 'userpro' expects parameter '#Username', which was not supplied - sql

Question

i am getting error of ExcecuteNonQuery ,i am not getting where i am wrong please help!
SqlConnection con = new SqlConnection(
"Data Source="";Initial Catalog=bunny;Integrated Security=SSPI");
SqlCommand cmd = new SqlCommand("userpro", con);
CommandType cd = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#Username", TextBox1.Text);
cmd.Parameters.AddWithValue("#Addresss", TextBox2.Text);
cmd.Parameters.AddWithValue("#Contact ", TextBox3.Text);
cmd.Parameters.AddWithValue("#EmailId", TextBox4.Text);
cmd.Parameters.AddWithValue("#Passwords", TextBox5.Text);
cmd.Parameters.AddWithValue("#ConfirmPassword", TextBox6.Text);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
this is my store procedure
create procedure userpro
#Username varchar (20),
#Addresss varchar (20),
#Contact varchar (20),
#EmailId varchar (20),
#Passwords varchar (20),
#ConfirmPassword varchar (20)
as
begin
if exists (select * from userlogs where Username=#Username)
begin
update userlogs set Addresss=#Addresss,Contact=#Contact,EmailId=#EmailId,Passwords=#Passwords,ConfirmPassword=#ConfirmPassword where Username=#Username
end
else
begin
insert into userlogs(Username,Addresss,Contact,EmailId,Passwords,ConfirmPassword) values (#Username,#Addresss,#Contact,#EmailId,#Passwords,#ConfirmPassword)
end
end

Answer 1

You need to check if TextBox1.Text is not null. If it is procedure will fail because #Username is mandatory. You can resolve this like that:
if(TextBox1.Text == null)
cmd.Parameters.AddWithValue("#Username", DBNull.Value);
else
cmd.Parameters.AddWithValue("#Username", TextBox1.Text);
Or you can make this parameter optional in your userpro procedure:
create procedure userpro
#Username varchar (20) = '',