Convert String to DataGridViewTextBoxColumn using VB.Net and Access

Can't find anything on the internet, I'm thinking I'm missing something small.

I've got a list of column names in an access database, which should match DataGridViewTextBoxColumn I've created in my vb.net project. I want to use the column names in the access database to call the DataGridViewTextBoxColumn into my dgv. Sample code below:

    Dim column1 As New DataGridViewTextBoxColumn
    Dim column2 As New DataGridViewTextBoxColumn
    Dim myheader As New DataGridViewTextBoxColumn

    With column1
        .Name = "column1"
        .HeaderText = "Column 1"
        .SortMode = DataGridViewColumnSortMode.NotSortable
        .Width = 200
    End With

    With column2
        .Name = "column2"
        .HeaderText = "Column 2"
        .SortMode = DataGridViewColumnSortMode.NotSortable
        .Width = 400
    End With

    a = 0

    Do While a < 2
        myheader = ds.Tables("columnheadersdatabase").Rows(a).Item("J001") '//rows(a) = column1 and rows(a + 1) = column2
        dgv.Columns.Add(myheader)
        a += 1
    Loop

the problem area is the below:

        myheader = ds.Tables("columnheadersdatabase").Rows(a).Item("J001") '//rows(a) = column1 and rows(a + 1) = column2
        dgv.Columns.Add(myheader)

I can seem to convert my access cell value to my DataGridViewTextBoxColumn (myheader). I tried using dim myheader as string, but that also doesn't work.

Has anybody got any ideas, any help will be much apprecated.