Not able to locate the object using Selenium

Not able to locate the object using Selenium

Hi I have the below html code, I am not able to identify the input id
button while Using Selenium (through Java). It is saying unable to locate
the element. Could you please help me out?
I tried using xpath and cssselector method but it is of no use. Do i need
to learn Javascript executor class for it? What are the various ways...
Kindly help me out
<span class="filed">
<input id="SubmitButton" type="submit"
onclick="javascript:WebForm_DoPostBackWithOptions(new
WebForm_PostBackOptions("SubmitButton", "", true, "Validation", "", false,
false))" value="SubmitButtonLabel" name="SubmitButton"/>
</span>