How to remove ViewState and EventValidation data in ASP.NET Control render to string?

I'm using the following method to render a user control to a string:

Page pageHolder = new Page();
pageHolder.EnableViewState = false;

UserControl viewControl = (UserContro开发者_JS百科l)pageHolder.LoadControl(path);
viewControl.EnableViewState = false;

System.Type viewControlType = viewControl.GetType();
HtmlForm tempForm = new HtmlForm();
tempForm.EnableViewState = false;

tempForm.Controls.Add(viewControl);
pageHolder.Controls.Add(tempForm);

StringWriter output = new StringWriter();
HttpContext.Current.Server.Execute(pageHolder, output, false);

string content = output.ToString();

However, in the output, there are sometimes hidden fields with __EVENTVALIDTION and __VIEWSTATE info as well as JavaScript to enable PostBack.

Is there a way to completely disable all WebForms/ViewState related code from being generated for the control I'm trying to render? Setting EnableViewState to false and setting the EnabledViewState="false" in the .ascx file doesn't seem to work.

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Did you try

<pages enableViewState="false" enableEventValidation="false">
...
</pages>

On your web.config?

I am not sure it's a good idea in general, but I assume you know what you are doing.

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You can set EnableViewState="false" in the directive of the user control. As for disabling event validation, I believe you can only do that through the web.config or page directive.