Popup Alert with message c#

I need to pop up an alert window with a sound and close button at a specific point in a procedure.

Any help would be appreciated.

Thank you
DovbermanAsked:
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Kyle AbrahamsConnect With a Mentor Senior .Net DeveloperCommented:
ScriptManager.RegisterStartupScript(this.Page, this.Page.GetType(), "NeedInfo", "alert('Please Put some more info in');", true);
            return;
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DovbermanAuthor Commented:
Perfect,

Thanks
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