How can I programatically open a new page in a new tab from my codebind file in ASP.NET?

Question

How can I programatically open a page in a new tab from my code behind file in ASP.NET after clicking on a button in my first page? Hopefully, from the new page I could also get to the Session[] array.

Answer 1

"Code behind" runs on the server, no browser instances there to open/use.
Javascript runs in the browser, on the client's computer, it can open a new tab.
If you want, you will have to write a piece in C# that will generate a JavaScript snippet with the window.open Command.

Answer 2

Just register a window.open command in the start client script.

In your C# client side code (event):

RegisterStartupScript("SomeNameForThisScript", "window.open('YourPage.aspx');");

When you page is served up, the startup script will fire and open a new window. You can customize how the window.open works via attributes.