c# web browser Invoke Script in event handler not working

Question

I am using web browser control and trying to call function in Javascript using document.InvokeScript.

It works everywhere else in my code except at the part where i call event handler for Process.Exited.

 //this function is being called from Javascript code.
public void Open()
{

    //****FROM HERE TO......****

    Object[] param = new Object[2];
    param[0] = "play";
    param[1] = "playDisabled";
    webBrowser1.Document.InvokeScript("disable", param);

    param[0] = "playDisabled";
    param[1] = "Playing";
    webBrowser1.Document.InvokeScript("setText", param);

    //****THERE, INVOKESCRIPT WORKS....****

    //there i open exe file...
    Process GameLaunch = new Process();
    GameLaunch.StartInfo.FileName = ExtractPath + gameFile;
    GameLaunch.StartInfo.Arguments = ExtractPath + gameFile;
    GameLaunch.EnableRaisingEvents = true;

    //after its closed i call GameLaunch_Exited method.
    GameLaunch.Exited += new EventHandler(GameLaunch_Exited);
    GameLaunch.Start();

}
void GameLaunch_Exited(object sender, EventArgs e)
{

   InvokeScript("btnReset", "#playDisabled");
}
private object InvokeScript(string name, params object[] args)
{
    //here it fires an error.
    return webBrowser1.Document.InvokeScript(name, args);
}
        private void button1_Click_1(object sender, EventArgs e)
        {
        InvokeScript("btnReset", "#playDisabled");
        string output = "";
        int i = 0;
        foreach (HtmlElement element in webBrowser1.Document.GetElementsByTagName("a"))
        {
            i++;
            output += i+". Element: id: "+ element.Id + ", inner html: "+ element.InnerHtml + Environment.NewLine;
        }
       MessageBox.Show(output);
    }

all i get from this code is: Specified cast is not valid.

Here are some screens:

Btw method InvokeScript works if i call it from button click handler. And doesn't if called from Exited Handler.

I'm really confused.

And the error itself:

For those who want to see my JS.

function btnReset(id){
  $(document).ready(function(){
     $(id).removeClass("disabled");
     $(id).html("Start");
     $(id).attr("id", "play");
 });
 }

EDIT: Exception Message:

An unhandled exception of type 'System.InvalidCastException' occurred in System.Windows.Forms.dll {"Specified cast is not valid."}

Additional information: Specified cast is not valid.

Thanks for Any help.

-Cheers

-Nick.