how to call function in .aspx.cs from ascx.cs

You can not access a function from usercontorl class unless you have instance of it in your page and the function is public. e.g. (usercontorl1.function1())

otherwise, you should have that function in a class inside AppCode

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WebUserControl1.Test("a", "b");

here Test is the function on the ascx.cs page

and WebUserControl1 is the ascx page which is used in the aspx page

I don't see any reason why you want to do this. But if you want you can use events and delegates.

create that function "public" and then you can use that function like this
in ascx.cs
puplic void somefunction(arguments)
{
// your code here
}

in aspx.cs

controlObject.somefunction(arguments);

WebUserControl1.Test("a", "b");

You need have that function in a class inside AppCode
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