How to automatically submit a Form in ASP.Net

I found the solution.....

My full code is below, I used java script code (window.onload = function() { document.forms[0].submit(); }) which is automatically submitting form.

HtmlElementCollection htmlelements = _windowManager.ActiveBrowser.Document.GetElementsByTagName("input");
                foreach (HtmlElement element in htmlelements)
                {
                    if ((element.Name == strUserName || element.Id == strUserName) && strUserName != "")
                    {
                        element.SetAttribute("value", strUserNameVal);
                    }
                    else if ((element.Name == strPassword || element.Id == strPassword) && strPassword != "")
                    {
                        element.SetAttribute("value", strPasswordVal);
                    }
                }

                        HtmlElement head = _windowManager.ActiveBrowser.Document.GetElementsByTagName("head")[0];
                        HtmlElement scriptEl = _windowManager.ActiveBrowser.Document.CreateElement("script");
                        IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
                        element.text = "window.onload = function() { document.forms[0].submit(); }";
                        head.AppendChild(scriptEl);
                        strAdditionalHeader = "";
                        _windowManager.ActiveBrowser.Document.InvokeScript("webBrowserControl");