WELOA.DAL/WEL/ls_exception.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using WELOA.Model;
using System.Configuration;

namespace LSDAL_SQL
{
    public class ls_exception
    {
        
        public Polytechnic delexception()
        {
            Polytechnic Polytechnic = new Polytechnic
            {
                nException = -1,
                rowsnum = -1
            };
            using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["lsstring"].ConnectionString))
            {
                SqlCommand command = connection.CreateCommand();
                command.CommandType = CommandType.Text;
                command.CommandText = "DELETE ls_exception WHERE time<'" + DateTime.Now.AddMonths(-1) + "'";
                try
                {
                    if (connection.State == ConnectionState.Closed)
                    {
                        connection.Open();
                    }
                    Polytechnic.rowsnum = command.ExecuteNonQuery();
                }
                catch (Exception exception)
                {
                    new ls_exception().insexception("ls_exception.cs delexception", exception.Message);
                    Polytechnic.nException = 1;
                    return Polytechnic;
                }
            }
            return Polytechnic;
        }

        public void insexception(string files, string exceptions)
        {
            using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["lsstring"].ConnectionString))
            {
                SqlCommand command = connection.CreateCommand();
                command.CommandType = CommandType.Text;
                command.CommandText = "INSERT INTO ls_exception (time,files,exceptions) VALUES ('" + DateTime.Now.ToString() + "',@files,@exceptions)";
                command.Parameters.AddWithValue("@files", files);
                command.Parameters.AddWithValue("@exceptions", exceptions);
                try
                {
                    if (connection.State == ConnectionState.Closed)
                    {
                        connection.Open();
                    }
                    command.ExecuteNonQuery();