Checkbox Column - Cannot change DataType of a column once it has data

Good Morning I have a little problem with my Program.

I have a table called period_closure and this is what it looks like

+----------+-----------+------+
| PeriodID | Month     | 2000 |
+----------+-----------+------+
|        1 | January   | NULL |
|        2 | February  | NULL |
|        3 | March     | NULL |
|        4 | April     | NULL |
|        5 | May       | NULL |
|        6 | June      | NULL |
|        7 | July      | NULL |
|        8 | August    | NULL |
|        9 | September | NULL |
|       10 | October   | NULL |
|       11 | November  | NULL |
|       12 | December  | NULL |
+----------+-----------+------+

My goal here is to create a list of checkboxcolumn under the field 2000 but when i try it, it has an error saying Cannot change DataType of a column once it has data.

Here is my code

  Dim con1 As MySqlConnection = New MySqlConnection("server=192.168.2.87;userid=root;password=admin1950;database=inventory")
        Dim sql1 As MySqlCommand = New MySqlCommand("Select * from period_closure", con1)
        Dim ds1 As DataSet = New DataSet
        Dim adapter1 As MySqlDataAdapter = New MySqlDataAdapter
        con1.Open()
        adapter1.SelectCommand = sql1
        adapter1.Fill(ds1, "MyTable")
        DataGridView1.DataSource = ds1.Tables(0)
        con1.Close()
        ds1.Tables(0).Columns(2).DataType = GetType(Boolean)
        Me.DataGridView1.Columns(0).Frozen = True
        Dim i As Integer
        For i = 0 To DataGridView1.Columns.Count - 1
            DataGridView1.Columns.Item(i).SortMode = DataGridViewColumnSortMode.Programmatic
        Next

How can I achieve it? and also just wanted to add that I will add more columns on it and my target is make all columns a checkboxcolumn except the Month and PeriodID