add column to datagridview

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C#

Hi,
I am working on an existing form which populates a datagridview as follows:
It is using a bindingsource because I see at the bottom of the form in designer the BindingSource control.

private void PopulateGrid()
        {
            System.Data.DataTable dt = TFNGet();
            fBS.DataSource = dt;
            dGV.AutoGenerateColumns = false;
            dGV.DataSource = fBS;
            int i = 0;
            dGV.Columns[i++].DataPropertyName = "BCode";
            dGV.Columns[i++].DataPropertyName = "FDCode";
            dGV.Columns[i++].DataPropertyName = "Currency";
            dGV.Columns[i++].DataPropertyName = "CCcy";
            dGV.Columns[i++].DataPropertyName = "VD";
            dGV.Columns[i++].DataPropertyName = "BS";
            dGV.Columns[i++].DataPropertyName = "A";
            dGV.Columns[i++].DataPropertyName = "PCN";
            dGV.Refresh();
        }

Now I would like to add a checkbox column as the first column to this dGV called "Failed"
So I am doing the following to do this but the error is:
"Index was out of range. Must be non-negative and less than the size of the collection.

private void PopulateGrid()
        {
            System.Data.DataTable dt = TFNGet();

		dt.Columns.Add("Failed", typeof(Boolean));

            fBS.DataSource = dt;
            dGV.AutoGenerateColumns = false;
            dGV.DataSource = fBS;
            int i = 0;
            dGV.Columns[i++].DataPropertyName = "BCode";
            dGV.Columns[i++].DataPropertyName = "FDCode";
            dGV.Columns[i++].DataPropertyName = "Currency";
            dGV.Columns[i++].DataPropertyName = "CCcy";
            dGV.Columns[i++].DataPropertyName = "VD";
            dGV.Columns[i++].DataPropertyName = "BS";
            dGV.Columns[i++].DataPropertyName = "A";
            dGV.Columns[i++].DataPropertyName = "PCN";

	//checkbox column
            dGV.Columns[i++].DataPropertyName = "Failed";

            dGV.Refresh();
        }

Any thoughts please?
Thanks