I want to get text from a querystring into a text box that is prt of a form view. I have tried writing code in the page load that changes the text value inside that text box but i get the error that the texbox name is not in the current context. My question is how to call a textbox (or any other control) inside a form view?

You can use the FormView's OnDataBound event to access the textbox on your formview:
OnDataBound="FormView1_OnDataBound"
 Protected Sub FormView1_OnDataBound(ByVal sender As Object, ByVal e As EventArgs)
        If FormView1.CurrentMode = DetailsViewMode.Insert Or FormView1.CurrentMode = DetailsViewMode.Edit Then
            Dim TextBox1 As TextBox
            TextBox = CType((FormView1.FindControl("yourTextBox")), TextBox)
            If Not TextBox1 Is Nothing Then
                TextBox1.Text = Request.QueryString("myState").ToString()
            End If
        End If
    End Sub  YouTextBox is your TextBox's name in both Insert and Edit ItemTemplate.
Limno