Can't programmatically click a button in the web browser

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C#

WinForms

WebBrowserControl

I'm trying to invoke the click event of a HTML button that lives inside a WebBrowser control in my Windows Forms application. I have successfully clicked many buttons before(I needed to click a button, which i did, but then their was another button that asked me to confirm an action. and i cant seem to click it!) this button has the same exact HTML as the button prior to it, however i cant seem to click it with the same coding, I don't get an error, just nothing happens. So, my objective: Get to the end target just like a human would. (no direct links, but the links that it would take a human to do it). Next have the program fill in a form, based on my windows form application's textboxes. Next, click a radio-button(bubbled). Click submit, And Finally click confirm. I managed to do all of this except clicking confirm! Im not sure why that is!
OK, here is the code:

private void button5_Click(object sender, EventArgs e)
        {
            toolStripStatusLabel1.Text = "Making human-like decisions..."; //update status bar.. 
            toolStripProgressBar1.Value = 50; //update status bar..
            wb.Navigate((boturl.Text) + "/dorf1.php"); //go to Page one
            while (wb.ReadyState != WebBrowserReadyState.Complete)  //wait for loaded page
            {
                Application.DoEvents();
            }
            wb.Navigate((boturl.Text) + "/dorf2.php");  // got to page two
            while (wb.ReadyState != WebBrowserReadyState.Complete)  //wait for loaded page
            {
                Application.DoEvents();
            }
            wb.Navigate((boturl.Text) + "/build.php?id=39"); // go to page three
            while (wb.ReadyState != WebBrowserReadyState.Complete)  //wait for loaded page
            {
                Application.DoEvents();
            }
            wb.Navigate((boturl.Text) + "/a2b.php"); // go to page four, the form that needs to be filled out.
            while (wb.ReadyState != WebBrowserReadyState.Complete) //wait for loaded page
            {
                Application.DoEvents();
            }

            // ok, now we fill out the form

            toolStripProgressBar1.Value = 70; //update status bar..
            toolStripStatusLabel1.Text = "Selecting Troops"; //update status bar..
            HtmlElement xcord = wb.Document.All["xCoordInput"]; //Find text box
            xcord.SetAttribute("value", (textBox1.Text)); //fill text box
            HtmlElement ycord = wb.Document.All["yCoordInput"];  //Find text box
            ycord.SetAttribute("value", (textBox2.Text));  //fill text box
            toolStripProgressBar1.Value = 90; //update status bar..
            toolStripStatusLabel1.Text = "Selecting Coords'"; //update status bar..
            foreach (HtmlElement hem in wb.Document.All)  //Click a bubble
            {
                if (hem.Name == "c" && hem.GetAttribute("value") == "3")
                {
                    hem.InvokeMember("click");
                    break;
                }
            }

            //  more filling out to do..

            HtmlElement unit1 = wb.Document.All["t1"];
            unit1.SetAttribute("value", (textBox4.Text));
            HtmlElement unit2 = wb.Document.All["t2"];
            unit2.SetAttribute("value", (textBox5.Text));
            HtmlElement unit3 = wb.Document.All["t3"];
            unit3.SetAttribute("value", (textBox6.Text));
            HtmlElement unit4 = wb.Document.All["t4"];
            unit4.SetAttribute("value", (textBox7.Text));
            HtmlElement unit5 = wb.Document.All["t5"];
            unit5.SetAttribute("value", (textBox8.Text));
            HtmlElement unit6 = wb.Document.All["t6"];
            unit6.SetAttribute("value", (textBox9.Text));
            HtmlElement unit7 = wb.Document.All["t10"];
            unit7.SetAttribute("value", (textBox10.Text));
            HtmlElement unit8 = wb.Document.All["t9"];
            unit8.SetAttribute("value", (textBox11.Text));
            HtmlElement unit9 = wb.Document.All["t8"];
            unit9.SetAttribute("value", (textBox12.Text));
            HtmlElement unit10 = wb.Document.All["t7"];
            unit10.SetAttribute("value", (textBox13.Text));
            
            //click ok button

            HtmlElement sendraid2 = wb.Document.All["btn_ok"];
            sendraid2.InvokeMember("click");
            while (wb.ReadyState != WebBrowserReadyState.Complete) // wait for loaded page
            {
                Application.DoEvents();
            }

            // <big>Click Confirm - HERE IS THE ISSUE</big>

            HtmlElement sendraid3 = wb.Document.All["btn_ok"];
            sendraid3.InvokeMember("click");
            while (wb.ReadyState != WebBrowserReadyState.Complete) //wait for the loaded page
            {
                Application.DoEvents();
            }
            
            
            toolStripProgressBar1.Value = 100; //update status bar..
            if (toolStripProgressBar1.Value == 100) //update status bar..
            {
                toolStripStatusLabel1.Text = "Sending..."; //update status bar..
                toolStripProgressBar1.Value = 0; //update status bar..
                toolStripStatusLabel1.Text = "Ready To Bot."; //update status bar..
            }
            
            // ok now the above actions will repeat IF there is a value in textbox3. it will repeat the above code every X                    Minutes.

            if (this.textBox3.Text != "")
            {
                int theInterval = 0;
                if (Int32.TryParse(this.textBox3.Text, out theInterval))
                {
                    if (theInterval != 0)
                    {
                        theTimer.Interval = theInterval * 10000;
                        theTimer.Start();
                    }
                }
            }
            else
            {
                btn_StopTimer_Click(null, null);
            }
             
        }

and here is the button's HTML(this is the button i cannot seem to click):

<button type="submit" value="ok" name="s1" id="btn_ok"><div class="button-container"><div class="button-position"><div class="btl"><div class="btr"><div class="btc"></div></div></div><div class="bml"><div class="bmr"><div class="bmc"></div></div></div><div class="bbl"><div class="bbr"><div class="bbc"></div></div></div></div><div class="button-contents">confirm</div></div></button>

Thanks!