WELOA.DAL/WEL/ls_install.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_install
{
    
    private ls_exception exlog = new ls_exception();
    private Polytechnic trinfo = new Polytechnic();

    
    public Polytechnic createTable_department()
    {
        this.trinfo.nException = -1;
        using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["lsstring"].ConnectionString))
        {
            SqlCommand command = connection.CreateCommand();
            command.CommandText = "CREATE TABLE ls_department ([id] [int] IDENTITY (1,1) not null  primary key, [department] [varchar] (20) not null ) ";
            try
            {
                if (connection.State == ConnectionState.Closed)
                {
                    connection.Open();
                }
                command.ExecuteNonQuery();
            }
            catch (Exception exception)
            {
                this.exlog.insexception("ls_install.cs createTable_department", exception.Message);
                this.trinfo.nException = 1;
                return this.trinfo;
            }
            return this.trinfo;
        }
    }

    public Polytechnic createTable_exception()
    {
        this.trinfo.nException = -1;
        using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["lsstring"].ConnectionString))
        {
            SqlCommand command = connection.CreateCommand();
            command.CommandText = "CREATE TABLE ls_exception ([id] [int] IDENTITY (1,1) not null primary key, [time] [datetime]  null, [files] [varchar] (100)  null,[exceptions] [varchar] (1000)  null) ";
            try
            {
                if (connection.State == ConnectionState.Closed)
                {
                    connection.Open();
                }
                command.ExecuteNonQuery();
            }
            catch
            {