How do I assign dataset table to a new datatable?

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VB

DataTable

dataset

i am trying to update a database table ("projenv") from a DGV.
the variables are also used for the DGV. this code works for another DB and DGV. i only changed the variable names.

i get an error

Public Class Form4
Dim dt2 As DataTable
Dim da2 As MySqlDataAdapter
Dim ds2 As DataSet 
Dim bsource2 As BindingSource = New BindingSource()

    Private Sub BtnHtUpdate_Click(sender As Object, e As EventArgs) Handles BtnHtUpdate.Click
        Dim dt2 As New DataTable
        dt2 = ds2.Tables("projenv") {problem is here}
        DGVEnvHtg.BindingContext(dt2).EndCurrentEdit()
        da2.Update(dt2)
    End Sub

any help would be greatly appreciated.
thanks,

What I have tried:

i have searched google, bing, duckduckgo. i have compared this code with an exact copy that works (variables changed) and cannot figured why it doesn't work.
this is my first time posting a question, i apologize if i didn't follow the proper protocol