问个新手问题 为什么我的注册信息写不进数据库啊 急！！

string strconn = "server=WORKGROU-DEC1E0;database=wzdu;uid=sa;pwd=******";
SqlConnection conn = new SqlConnection(strconn);
SqlCommand insertcmd=new SqlCommand();
insertcmd.Connection=conn;
insertcmd.Parameters.Add("@id",id);
insertcmd.Parameters.Add("@mm1",mm1);
insertcmd.CommandText="insert into wzxx1 values(@id,@mm1)";
conn.Open();
insertcmd.ExecuteNonQuery();
conn.Close();