为什么我不能在 aspx.cs 文件中使用我的 c# 类？

Question

My c# class code (Class1.cs):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Montajat.App_Code
{
    public class Class1
    {

    }
}

default.aspx.cs code:

public partial class _default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

How can I use Class1 in Page_Load of my aspx.cs file and why can`t I use it at the moment ?

Answer 1

on top include namespace :

using Montajat.App_Code;

public partial class _default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     Class1 objClass1 = new Class1();
    }
}

or you can do it using fully qualified name:

public partial class _default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     Montajat.App_Code.Class1 objClass1 = new Montajat.App_Code.Class1();
    }
}

your class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Montajat.App_Code
{
    public class Class1
    {
      public Class1()
      {

      }
    }
}

Answer 2

public partial class _default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     var objClass1 = new Montajat.App_Code.Class1();
    }
}

Does this works? Maybe you are missing the namespace?

Also, verify that your website has a reference to the project where you class is located. If you are not in the same project, you need to have a dll reference to the one that contain your class.