Unable to find element with Xpath - Selenium

Question

I'm trying to click an Element but having some issues. First, there's a pop up window which I'm switching to, which seems to be written ok.

foreach (string handle in _webdriver.WindowHandles)
{
     if (!handle.Equals(parentHandle))
     {
         _webdriver.SwitchTo().Window(handle);
     }
}

Then, I'm trying to click an element inside this pop up by this code:

var myElement = wait.Until(x => x.FindElement(By.XPath("//td[@id='firstname_d']/div[@class='ms-crm-Input-Container']/input[@id='firstname']")));
myElement.SendKeys("foo");

I'm getting an Error:

Unable to find element with Xpath

The HTML is as follow:

<tr valign="top">
  <td class="ms-crm-FieldLabel-LeftAlign  FormSection_CellPadding ms-crm-Field-Recommended" id="firstname_c">
  <td id="firstname_d" style="overflow: hidden;" formxmlcolspan="1">
     <div class="ms-crm-Input-Container focus" id="firstname_container">
       <input tabindex="1010" class="ms-crm-Input ms-crm-Text" id="firstname" style="ime-mode: active;" type="text" maxlength="50" attrformat="text" attrpriv="7" attrname="firstname" req="1" value=""/>

What am I doing wrong?

Answer 1

You can try with the id

driver.FindElement(By.Id("firstname")).SendKeys("foo");

Or using contains

driver.FindElement(By.XPath("//input[contains(@id, 'firstname')]")).SendKeys("foo");

Edit

You can switch to the <iframe> after the window switch

foreach (string handle in _webdriver.WindowHandles)
{
    if (!handle.Equals(parentHandle))
    {
        _webdriver.SwitchTo().Window(handle);
    }
}

_webdriver.SwitchTo().Frame("foo");

_webdriver.FindElement(By.Id("firstname")).SendKeys("foo");

Answer 2

u can write following code and try it Set st=driver.getWindowHandles(); Iterator it= st.iterator(); String parent=t.next();
String child=it.next(); driver.switchTo().frame(child); WebElement ele= driver.findElement(By.id("id="firstname_container")); ele.sendKeys("foo