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HTML Form Interaction

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Hello,
So im in the process of completing an html form but am having some issues clicking the submit button after the form is completed.

Code:

Private Sub WebBrowser1_DocumentCompleted(sender As Object, e As WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
        Dim allelements As HtmlElementCollection = WebBrowser1.Document.All

        For Each webpageelement As HtmlElement In allelements
            If (webpageelement.GetAttribute("ID").Contains("sys_display.incident.caller_id")) Then
                webpageelement.SetAttribute("value", "MyUserName")
                webpageelement.Focus()
                webpageelement.InvokeMember(Keys.Tab)
            End If
        Next
        For Each webpageelement As HtmlElement In allelements
            If (webpageelement.GetAttribute("ID").Contains("sys_readonly.incident.caller_id.user_name")) Then
                webpageelement.InvokeMember("Click")
            End If
        Next
        For Each webpageelement As HtmlElement In allelements
            If (webpageelement.GetAttribute("ID").Contains("incident.short_description")) Then
                webpageelement.SetAttribute("value", "Test")
            End If
        Next
        For Each webpageelement As HtmlElement In allelements
            If (webpageelement.GetAttribute("id").Contains("incident.comments")) Then
                webpageelement.Focus()
                webpageelement.SetAttribute("value", "Test")
                webpageelement.InvokeMember("Click")
            End If
        Next
        For Each webpageelement As HtmlElement In allelements
            If (webpageelement.GetAttribute("ID").Contains("incident.assignment_group")) Then
                webpageelement.SetAttribute("value", "MyGroup")
                webpageelement.Focus()
                webpageelement.InvokeMember(Keys.Tab)
            End If
        Next

'This is my submit button
            For Each webpageelement As HtmlElement In allelements
                If (webpageelement.GetAttribute("ID").Contains("sysverb_insert")) Then
                    webpageelement.InvokeMember("Click")
                End If
            Next

The form validates the username and updates other fields. I'm looking for a way to wait for the form to validate the name then click submit.

I've tried verifying that the name field is not empty.
Code:

Dim name = WebBrowser1.Document.GetElementById("sys_display.incident.caller_id")

        If name IsNot Nothing Then
            For Each webpageelement As HtmlElement In allelements
                If (webpageelement.GetAttribute("ID").Contains("sysverb_insert")) Then
                    webpageelement.InvokeMember("Click")
                End If
            Next

        End If

'This code does click the button when assigned to a VB.net button.
Code:

For Each webpageelement As HtmlElement In allelements
                If (webpageelement.GetAttribute("ID").Contains("sysverb_insert")) Then
                    webpageelement.InvokeMember("Click")
                End If
            Next

Any help is greatly appreciated.

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