how to hide website url in alertbox using iFrame

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C#

ASP.NET

IFrame

Hi All,

How to avoid the website url in alertbox.

am developing web application in asp.net with c#. that project deploy in hosting server. after hosting the url are assign to Iframe src="http://23.24.25:35/Registration.aspx".
in Registration.aspx page having alert box code using c#.

ScriptManager.RegisterStartupScript(Page, Page.GetType(), "alert", "alert('Registration has been completed successfully.');window.location='Registration.aspx';", true);

my issue is alerbox messages show likes in Iframe
" https://23.24.25:35/ says"
Registration has been completed successfully.

how to hide the https://23.24.25:35/ url in alert box

please help me..

thanks and regards