Can I use more of one C# BehindCode?

Question

User196874992 posted

I'm programing in ASP .NET with c# behindcode and now i have a lot of code lines, I want to know if i can use more of one codebehind and interconnect for exaample:

A.aspx.cs

 protected void ddlExample_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ddlExample.SelectedValue == "OPTION A")
            {
                functionExample();
            }
        }

B.aspx.cs

privte void functionExample(){
//DO SOMETHING
}

Answer 1

User1535942433 posted

 Hi EvansGxz,

As far as I think,there's no way to call event in the another page unless you redirect to the other page and the page load.And then call the event in the page load.

Just like this:

A.aspx.cs:

protected void ddlExample_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ddlExample.SelectedValue == "OPTION A")
            {
                Response.Redirect("B.aspx");
            }
        }

B.aspx.cs:

protected void Page_Load(object sender, EventArgs e)
{
 functionExample();
}
protected void functionExample(){
//DO SOMETHING
}

Best regards,

Yijing Sun

Answer 2

User-821857111 posted

Code behind files contain partial classes, so you can divide the code in a single file among multiple files if you wish. 

public partial class Default : Page
{
    ...
}

Answer 3

User753101303 posted

Hi,

When you want to use the same code from multiple places you usually create a separate class that you can then use where you want pretty much like any class provvided by .NET such as System.IO.File etc...

See perhaps https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/classes 

You alos have other feartures that could help dependng on the exact use case.

Answer 4

User196874992 posted

Code behind files contain partial classes, so you can divide the code in a single file among multiple files if you wish. 

public partial class Default : Page
{
    ...
}

How can I do that? I using visual studio but when I do Right-Click on the page.aspx I can't add a new aspx.cs file

Answer 5

User475983607 posted

Add a new class not an ASPX page.  I think you'll be interested in learning the "partial" keyword.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/partial-classes-and-methods