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An HTML document may have one or more FORM elements with input fields for submitting data back to a server.
You can programmatically submit a FORM by obtaining its System.Windows.Forms.HtmlElement and calling its Submit method using the erload:System.Windows.Forms.HtmlElement.InvokeMember method.
To add a new FORM to a document, you can either create a new FORM tag as a string, and assign it to the HtmlElement.InnerHtml property of an element previously added to the HTML DOM; or you can use the HtmlDocument.CreateElement(string) method, set its properties using HtmlElement.SetAttribute(string, string), and add it as a child of an existing element using HtmlElement.AppendChild(HtmlElement).