window.showModalDialog execute on code behind

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ASP.NET

Javascript

Hello fellow programmers, Im a little confused right now on my coding so I am seeking your help. What I am trying to accomplish to execute my javascript from my master page on server side. Here is my code on javascript on show modal dialog (master page)

function OpenPopup() {
            if (window.showModalDialog) {
                window.showModalDialog("PopUp.aspx", "PopUp",
"dialogWidth:550px;dialogHeight:300px,window.location = window.location;");
                window.location.reload();
            } else {
                window.open('PopUp.aspx', 'name', 'height=350,width=600,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no ,modal=yes');

            }
        }
    </script>

Now I am trying to execute my javascript on code behind here is my trial code but so far nothing is working. Please help

If e.CommandName = "cmdAdd" Then
           Dim addimage As ImageButton = DirectCast(e.CommandSource.FindControl("ImageAdd"), ImageButton)
           Dim coursecatId As String = addimage.CommandArgument
           Session("AddChecking") = "1"
           Session("AddCourseCatID") = coursecatId
           Session("AddYear") = drpdwnYear.Text
           Session("AddDiscipline") = DropDownList1.SelectedValue
           'addimage.Attributes.Add("onclick", "javascript:return OpenPopup()")

           'If (Not ClientScript.IsStartupScriptRegistered("OpenPopup")) Then
           'Page.ClientScript.RegisterStartupScript(Me.GetType(), "Popup", "OpenPopup();", True)
           'End If
           'Master.Page.ClientScript.RegisterStartupScript(Me.[GetType](), "OpenPopup", "window.showModalDialog('PopUp.aspx','','');", True)
           'dialogWidth:550px;dialogHeight:300px,window.location = window.location;
           'Dim script = "var $dialog = $('<div></div>').html('This dialog will show every time!').dialog({autoOpen: false,title: 'Basic Dialog'});$dialog.dialog('open');"
           'Master.Page.ClientScript.RegisterStartupScript(Me.GetType(), "OpenPopup();", script, True)
           'Dim script = ("OpenPopup();")
           'Master.Page.ClientScript.RegisterStartupScript([GetType](), Guid.NewGuid().ToString(), script, True)


       Else

note that addimage.attribute.add(...) is working but I have to double click which will kinda frustrate the user. I cannot use it on rowdatabound cause I need the sessions so what I really need is RegisterStartupScript.

thanks and more power