c# - WebBrowser Control update hidden field -

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I'm trying to change the value in the hidden field in the webbrowser control.

I can inject a warning box that displays JavaScript. I can show the alert box to the current value of the hidden area. However, I can not get to change the price of the hidden area

I have tried to change the value (TB Webbroser control) by doing this: 

  HtmlElement head = tb.Document.GetElementsByTagName ("head") [0 ]; HtmlElement script EL = TB Document Crate Element ("script"); IHTMLScriptElement element = (IHTMLScriptElement) scriptEl.DomElement; Element.text = "function doIt () {document.getElementById ('Test Hydfied'). Value = 'Hello World'; Warning ('Update');}"; Head.AppendChild (scriptEl); Tb.Document.InvokeScript ("Chart");   
 The above warning pops up.  
 And I have tried to:  
  tb.Document.Body.InnerHtml = Tb.Document.Body.InnerHtml.Replace ("MyValue", "YourValue ");   
 In the above I see that InHHMM changes during debugging.  
 However, the value will never change when the page is loading and I am viewing the source.  
 Also, though I can inject JavaScript and pop up this warning, I am never able to find javascript int.  
 What's going on? What am i doing  
 Thank you!  
 Update:  
     
  •  
     I am doing this document in a compilation event.   
  •  
     I'm not using the viewsto    
     Another update:  
     I have a This area added a non-hidden text field this time.  
      & lt; Input type = "hidden" id = "TestHiddenField" value = "MyValue" name = "TestHiddenField" /> & Lt; Input type = "text" id = "testField" value = "myValue" name = "TestField" />   
     This is when I do this:  
      tb.Document.Body.InnerHtml = tb.Document.Body.InnerHtml.Replace (" MyValue "," Your Velocity ");   
     When the webbrowser reads the page in control, the text box displays the text "YourValue", but when I look at the source, the value is still equal to "MyValue" .  
     What's up with that?  
     Any thoughts?  
     Thanks again!   
     
      
     Unless the page is loading after   you will have to wait for Document Compiled Event to fire.

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