ClientScript.RegisterStartupScript not working

Question

I have searched SO & google, but I can\'t seem to get this to work. The code is in the codebehind click event of a \"Cancel\" button in my asp.net application but does

Answer 1

You can use this instead

ScriptManager.RegisterStartupScript(this.Page, GetType(), "ClosePopup", "window.close();", true);

or you can also try this one

Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "ClosePopup", "window.close();", true);

Have a Good day.