To emmit script after loading of all controls at client side browser use this C# code

Now we will close the broser / popup window close on Save botton click

On save button click  we will write following code to close the window

string str = "opener.location.reload(true);self.close();"; Page.RegisterClientScriptBlock("xx", "<script>"+str+"</script>");  // this will emit after saving the page and // it will colse the opened window and refresh parent window

Alert Examle snippet

public void Page_Load(Object sender, EventArgs e)       {         if (!this.IsClientScriptBlockRegistered("MyFirstScript"))         {               // create script that is to be registered at client side.               String scriptString = "<script language=\"JavaScript\">alert('Hello world'); </script>";              this.RegisterClientScriptBlock("MyFirstScript", scriptString);         }       }

It will alert Hello world at cleint after loading all controls IE.