how to pass strings to a procedure

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C#

C#4.0

here is my code problem is it not executing after "SqlDataReader rdr = command.ExecuteReader();"
whats the problem over there can u help me

sql_string = ("Data Source=000.000.000.000;Initial Catalog=GCERP_SEC;User Id=sa;Password=kamikami;");
                SqlConnection conn = new SqlConnection(sql_string);
                SqlCommand command = new SqlCommand(str_querry, conn);
                
                conn.Open();
               
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.AddWithValue("@string1" ,SecurityModule.userName_AD);
                command.Parameters.AddWithValue("@string2", SecurityModule.moduleid);
               // SqlDataReader rdr =StoredProcedureCommand.ExecuteReader();
                
               SqlDataReader rdr = command.ExecuteReader();
              
                if (rdr.HasRows)
                {
                    StringBuilder sb = new StringBuilder();
                    string a;
                    while (rdr.Read())
                    {
                        sb.Append(((int)rdr["fnid_int"]).ToString());
                        sb.Append("\n");
                        a = sb.ToString();
                        function_name(a);
                        sb.Length = 0;
                     }                   
                        
                }
                else
                {
                    MessageBox.Show("not found");
                }
                rdr.Close();
                command.ExecuteNonQuery();
                count++;
                conn.Close();
                conn.Dispose();

            }
            catch (Exception)
            {
                MessageBox.Show("Error in database connection");
            }
        }