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Editorial Team
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Asked: 2026-06-16T07:02:25+00:00

I’m moving from PHP to ASP.NET/C#. So far so good, but I don’t understand

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I’m moving from PHP to ASP.NET/C#. So far so good, but I don’t understand how to instantiate a class within a ASP.NET C# class page.

For example I have login.aspx:

<%@ Page Language="C#" Inherits="Portal.LoginService" src="LoginService.cs" %>

<!DOCTYPE html>
<body>
    <form runat="server" id="login" name="login">           
        <p>Username:</p><input type="text" id="username" name="username" runat="server" />  

        <p>Password:</p><input type="password" id="password" name="password" runat="server" />

        <input type="submit" name="submit" OnServerClick="Post_Form" runat="Server" /> 
    </form>
</body>

LoginService.cs:

using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;
namespace Portal {
public class LoginService : Page {

    protected HtmlInputControl username, password;

    public void Post_Form(object sender, EventArgs e) {

        if (username.Value != "" && password.Value != "") {
            //LOGIC HERE

            //This doesn't work
            CustomSanitize a = new CustomSanitize();                              
        }
    }
}
}

CustomSanitize.cs:

using System;
namespace Portal {
    public class CustomSanitize {

        //instantiate here

        public string sanitizeUserPass() {
                return "logic here"
            }
    }
}

In other words, I want to use methods from different classes with the classes I have setup with ASP.NET C#. Namespaces didn’t work for me thus far.

Thank you for any input.

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1 Answer

  1. Editorial Team

    If I undertstood you correctly, wrap CustomSanitize in a namespace i.e:

    namespace MyProject {
    public class CustomSanitize {

        //instantiate here

        public string sanitizeUserPass() {
                return "logic here"
            }
    }
}

    Then wrap LoginService.cs in the same namespace. i.e

    namespace MyProject {
    public class LoginService : Page {

        protected HtmlInputControl username, password;

        public void Post_Form(object sender, EventArgs e) {

            if (username.Value != "" && password.Value != "") {
                //LOGIC HERE

                //This doesn't work
                //CustomSanitize a = new CustomSanitize();                              
            }
        }
    }
}

    You should now have access to CustomSanitize a = new CustomSanitize();

    You can also create more namespaces to split up your project. i.e namespace MyProject.Helper to wrap all your helper functions, then just add using MyProject.Helper to the top of the .cs file you wish to use the classes on.

    Edit:

    Please note, when adding a namespace to your project / wrapping classes in a namespace you need to reference them via that namespace via using or directly like MyProject.LoginService. This must be done on aspx, ascx pages as well using the @ Page declaration.

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