How to open SharePoint application page in modal dialog (popup) using c#?

C# Code:

void OpenApplicationPageAsPopup(){
string strWebUrl = SPContext.Current.Web.Url;
string strPageURL = strWebUrl + "/_layouts/MyLayoutFolder/MyPage.aspx";
System.Web.UI.ScriptManager.RegisterStartupScript(this, this.GetType(), ClientID, "ExecuteOrDelayUntilScriptLoaded(openModelDialogPopup('" + strPageURL + "'), \"SP.js\");", true);

}

JavaScript Code:

function openModelDialogPopup(strPageURL ) {

    var dialogOptions = {
        title: "This is Modal Dialog", //Popup title.
        url: strPageURL, 
        width: 600, // Width of the dialog.
        height: 400
    };
    SP.SOD.execute('sp.ui.dialog.js', 'SP.UI.ModalDialog.showModalDialog', dialogOptions);
    return false;
}