[C#] BindingContext[...].Position not working

[hkucsis]

Hi,

I am working on a window form app and have successfully bind the data to the controls with the following code

....
dsMail = new DataSet();
sqlDataAdapter.Fill(dsMail, "myTable") ;
DataTable dt = dsMail.Tables["myTable"];

lstSub.DataSource = dt;
lstSub.DisplayMember = "subject";
         
txtMessage.DataBindings.Add(new Binding("Text",dt,"message"));

but when I want to navigate the dataset dsMail through bindingContext.position (something like)

private void button2_Click(object sender, System.EventArgs e)
{
	this.BindingContext[this.dsMail, "myTable"].Position = anInteger ;
}

The controls do not reflect the change of position in the dataset.

How can I change the contents of the control to show the "current record" in dataset?

Many thanks.