How to switch different table throgh the combobox without adding additional column

I have a database named appmondb and I want to use the combobox to switch tables. If I select the ids table first, it is no problem, but if I select the accounts table next, the fields of ids and accounts will appear at the same time.

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
        currentdt.Clear();//clear table 
        dataGridView1.DataSource = null;

        MySqlDataAdapter adapter = new MySqlDataAdapter();
        MySqlCommand cmd;
        string sql = "SELECT * FROM " + comboBox1.Text;

        cmd = new MySqlCommand(sql, Connection.connMaster);

        adapter.SelectCommand = cmd;
        adapter.Fill(currentdt);

        dataGridView1.DataSource = currentdt;
        totalPage = calculateTotalPages(currentdt);//update totalPage
}

first I choose ids table

after that, I select accounts table

I have something to say that it should be .fill() or the wording of dataset and datatable

Calling Clear on the DataTable removes all the rows but it doesn't remove the columns, so they are still there when you call Fill for the new query. You'll need to either create a new DataTable each time or else Clear the Columns collection as well.

I'm fairly certain that clearing the DataSource is not going to remove any columns from the grid either, so you're going to have to Clear the Columns collection of the grid too. Like so:

dataGridView1.DataSource = null;
dataGridView1.Columns.Clear();
currentdt.Clear();
currentdt.Columns.Clear();