Index -1 does not have a value

Question

Hello dear, good afternoon. I have a small problem that I no longer know how to solve, I expose

I need to go from one DataGridView to another for this I have the following, I will only show you the image of the form to not be so extensive.

 

 

 

This is the code:

An Aux List

public class AuxProducto
    {
        public int ProductoId { get; set; }
        public string Codigo { get; set; }
        public string ProductoDescripcion { get; set; }
        public decimal PrecioVenta { get; set; }
    }

A List of the AuxProduct Class

List<AuxProducto> ListaAuxProducto = new List<AuxProducto>();

The datasource of the datagrid on the right is this

private void CargarDatagriViewProdPrecioNuevo()
        {
            DataGridViewPrecioNuevo.DataSource = ListaAuxProducto;
        }

 

 The button code that goes from one datagridview to another is this

 

private void button1_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow fila in DataGridViewPreciosAntiguo.Rows)
            {
                AuxProducto auxProducto = new AuxProducto();
                if (Convert.ToBoolean(fila.Cells["Select"].Value))
                {
                    auxProducto.ProductoId = (int)fila.Cells["Id"].Value;
                    auxProducto.Codigo = fila.Cells["Codigo"].Value.ToString();
                    auxProducto.ProductoDescripcion = fila.Cells["ProductoDescripcion"].Value.ToString();
                    auxProducto.PrecioVenta = 0.00M;
                    ListaAuxProducto.Add(auxProducto);
                    DataGridViewPrecioNuevo.DataSource = null;
                    DataGridViewPrecioNuevo.DataSource = ListaAuxProducto;
                }
            }
        }

As you can see, everything does as it should be done, or maybe there is some error please let me know.

In the form on the right, I need to add a new price in the new column, when I click on any part of the datagridview I get the error

 

 

where can my mistake be please.

 

 

 I appreciate the collaboration,

 

Roberto