RegisterStartupScript demonstrates injecting client side script from an ASP.NET Server Control.
The idea is to inject a script that gets called as soon as the page loads. Simple javascript. But this can be done on the fly using registerstartup script.
Difference Between RegisterClientScript & RegisterStartupScript
The main difference is that the RegisterStartupScript method places the JavaScript at the bottom of the ASP.NET page right before the closing </form> element. The RegisterClientScriptBlock method places the JavaScript directly after the opening <form> element in the page.
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