How to call Jquery function from C#

Question

I would like to fadein and out a div after performing some code. This JQuery function is working fine when using the button\'s onclientclick property. But, Unable to call it

Answer 1

C#

protected void btn_click(object sender, Eventargs e)
{
    ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "script", "Confirm();", true);
}

JS:

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Edit Improve Code

C#

protected void btn_click(object sender, Eventargs e)
{
    ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "script", "Confirm();", true);
}

JS: