What type of ASP.NET (C#) architecture?

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Text;
using System.IO;
using System.Web;
using System.Net;
 
/// <summary>
/// Summary description for dbLayer
/// </summary>
public class dbLayer
{
    private string gConnString;
    public dbLayer(string strConnn)
    {
        gConnString = strConnn;
    }
 
    public void WebConfig_ActivityLog(string username, string activity)
    {
        SqlConnection sqlConn = new SqlConnection();
        SqlCommand sqlCmd = new SqlCommand();
 
        sqlConn.ConnectionString = gConnString;
 
        sqlCmd.CommandText = "dbo.[sp_Activity_Trail]";
        sqlCmd.CommandType = CommandType.StoredProcedure;
        sqlCmd.Connection = sqlConn;
 
        sqlCmd.Parameters.Add(new System.Data.SqlClient.SqlParameter("@username", SqlDbType.VarChar, 255));
        sqlCmd.Parameters.Add(new System.Data.SqlClient.SqlParameter("@activity", SqlDbType.VarChar, 4000));
 
        sqlCmd.Parameters["@username"].Value = username;
        sqlCmd.Parameters["@activity"].Value = activity;
 
        try
        {
            sqlConn.Open();
            sqlCmd.ExecuteNonQuery();
        }
        catch (Exception objExp)
        {
            throw objExp;
        }
        finally
        {
            if (sqlConn != null && sqlConn.State != System.Data.ConnectionState.Closed)
            {
                sqlConn.Close();
            }
        }
    }
}