How to make Class1.Cs appear?

Question

In my WEB FOLDER I have the file aspx.cs and the following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using WebApplication1.App_Code;

namespace WebApplication1.bibliotecario
{
    public partial class adicionar_livros : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\samue\source\repos\WebApplication1\WebApplication1\App_Data\gerenciamentoBiblioteca.mdf;Integrated Security=True");
        protected void Page_Load(object sender, EventArgs e)
        {
            if (con.State == System.Data.ConnectionState.Open)
            {
                con.Close();
            }
            con.Open();

        }

        protected void b1_Click(object sender, EventArgs e)
        {

            string books_image_name = Class1.GetRandomPassword(10);

            string path = "";
            f1.SaveAs(Request.PhysicalApplicationPath + "/bibliotecario/imagens_livros/" + f1.FileName.ToString());
            path = "imagens_livros/"+f1.FileName.ToString();
            
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "insert into livros values('"+ titulolivros.Text +"','"+ path.ToString() + "','"+ nomeautor.Text + "','" + isbn.Text + "','" + qtd.Text + "')";
            cmd.ExecuteNonQuery();

            msg.Style.Add("display", "block");
        }
    }
}
   

And I have a class .cs calling for Class1 inside an Asp.net folder, App_code folder. But every time I call Class1 she is not recognized, there is no option to put it in my code, as I do to have access to it?

This is the class Class1.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
    
        public static string GetRandomPassword(int length)
    {
    char[] chars = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
    string password = string.Empty;
    Random random = new Random();

    for (int i = 0; i < length; i++)
    {
    int x = random.Next(1, chars.Length);
    //For avoiding Repetation of Characters
    if (!password.Contains(chars.GetValue(x).ToString()))
    password += chars.GetValue(x);
    else
    i=i-1;
    }
    return password;
    }

}

Answer 1

Just add the namespace you want before the class in this case by your using I believe that the ideal would be something like the following by putting as namespace "Webapplication1.App_code":

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;



namespace WebApplication1.App_Code
{

/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
    
        public static string GetRandomPassword(int length)
    {
    char[] chars = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
    string password = string.Empty;
    Random random = new Random();

    for (int i = 0; i < length; i++)
    {
    int x = random.Next(1, chars.Length);
    //For avoiding Repetation of Characters
    if (!password.Contains(chars.GetValue(x).ToString()))
    password += chars.GetValue(x);
    else
    i=i-1;
    }
    return password;
    }

}
}