VB.NET - NullReferenceError was Unhandled when I use text from a different form

Question

I am trying to create a program where people can upload text to a database. I am using a WebBrowser to accomplish this however, when the code tries to use the text from the other form it creates a NullReferenceError was unhandled when I try to run the code in debug.

This is my current code in the form when the upload takes place:

Public Class Form2
    Private Sub Form2_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        WebBrowser1.Navigate("http://database.insma.org/")
        WebBrowser1.AllowNavigation = True
    End Sub

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        WebBrowser1.Document.GetElementById("name").SetAttribute("value", TextBox1.Text)
        WebBrowser1.Document.GetElementById("pass").SetAttribute("value", TextBox2.Text)
        WebBrowser1.Document.GetElementById("edit-submit--2").InvokeMember("click")
        Threading.Thread.Sleep(1000)
        WebBrowser1.AllowNavigation = True
        WebBrowser1.Navigate("http://database.insma.org/?q=node/add/log")
        Threading.Thread.Sleep(1000)
        WebBrowser1.Document.GetElementById("title").SetAttribute("value", Form1.TextBox2.Text)
        WebBrowser1.Document.GetElementById("field_time_utc_[und][0][value]").SetAttribute("value", Form1.TextBox4.Text)
        WebBrowser1.Document.GetElementById("field_location_ex_utwente_hong_k[und][0][value]").SetAttribute("value", Form1.TextBox5.Text)
        WebBrowser1.Document.GetElementById("field_frequency[und][0][value]").SetAttribute("value", Form1.TextBox3.Text)
        WebBrowser1.Document.GetElementById("field_id[und][0][value]").SetAttribute("value", Form1.TextBox6.Text)
        WebBrowser1.Document.GetElementById("field_call_up[und][0][value]").SetAttribute("value", Form1.TextBox7.Text)
        WebBrowser1.Document.GetElementById("field_group_count[und][0][value]").SetAttribute("value", Form1.TextBox8.Text)
        WebBrowser1.Document.GetElementById("body[und][0][value]").SetAttribute("value", Form1.TextBox1.Text)
        WebBrowser1.Document.GetElementById("edit-submit").InvokeMember("click")
        Threading.Thread.Sleep(1000)
        MsgBox("Uploaded to the database!")
    End Sub

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs)

    End Sub
End Class

This is how the error looks like: https://i.stack.imgur.com/1y8r5.png

It would be much appreciated if you dumb it down for me when you are explaining what is going on since I may not understand what you guys are trying to do.

It would also be awesome if you supply me with the solution to the error!

Thanks, Weighted Cube

You must have a reference to an existing object of type `Form1`. `Form1` names a *class*, not an *object*. — Cody Gray - on strike, Jul 25 '14 at 12:44
possible duplicate of [What is a NullReferenceException and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — Ňɏssa Pøngjǣrdenlarp, Jul 25 '14 at 23:54

Hoh · Answer 1 · 2014-07-25T13:04:03.550

Just bellow your class Instance, write this:

Public Class Form2
    Dim Form1 As New Form1()
    Private Sub Form2_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        WebBrowser1.Navigate("http://database.insma.org/")
        WebBrowser1.AllowNavigation = True
    End Sub

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        WebBrowser1.Document.GetElementById("name").SetAttribute("value", TextBox1.Text)
        WebBrowser1.Document.GetElementById("pass").SetAttribute("value", TextBox2.Text)
        WebBrowser1.Document.GetElementById("edit-submit--2").InvokeMember("click")
        Threading.Thread.Sleep(1000)
        WebBrowser1.AllowNavigation = True
        WebBrowser1.Navigate("http://database.insma.org/?q=node/add/log")
        Threading.Thread.Sleep(1000)
        WebBrowser1.Document.GetElementById("title").SetAttribute("value", Form1.TextBox2.Text)
        WebBrowser1.Document.GetElementById("field_time_utc_[und][0][value]").SetAttribute("value", Form1.TextBox4.Text)
        WebBrowser1.Document.GetElementById("field_location_ex_utwente_hong_k[und][0][value]").SetAttribute("value", Form1.TextBox5.Text)
        WebBrowser1.Document.GetElementById("field_frequency[und][0][value]").SetAttribute("value", Form1.TextBox3.Text)
        WebBrowser1.Document.GetElementById("field_id[und][0][value]").SetAttribute("value", Form1.TextBox6.Text)
        WebBrowser1.Document.GetElementById("field_call_up[und][0][value]").SetAttribute("value", Form1.TextBox7.Text)
        WebBrowser1.Document.GetElementById("field_group_count[und][0][value]").SetAttribute("value", Form1.TextBox8.Text)
        WebBrowser1.Document.GetElementById("body[und][0][value]").SetAttribute("value", Form1.TextBox1.Text)
        WebBrowser1.Document.GetElementById("edit-submit").InvokeMember("click")
        Threading.Thread.Sleep(1000)
        MsgBox("Uploaded to the database!")
    End Sub

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs)

    End Sub
End Class

Could you add that into a example please? For some reason it's not working and I might have put the Dim Form1 As New Form1 () in the incorrect spot — Dreadnought, Jul 25 '14 at 12:18
Hmm, tried it and it didn't work, came up with the same error — Dreadnought, Jul 25 '14 at 13:27

VB.NET - NullReferenceError was Unhandled when I use text from a different form

1 Answers1