Question

I have a datagridview showing installments of a loan. I created a datagridviewcheckbox column so then I can select all the installments i want to pay for.

This is a screen of the datagrid:

My issue is that I need to disable the checkboxes of the paid intallments. In this case, when “Restante” (what´s left to pay) is = 0.

I read some posts where they used the paint event to not show the checkbox cell, but i didnt like that solution. I thought of hiding the checkbox cell, but i don´t know if it is possible to do that.

Thats what i tried:

foreach (DataGridViewRow row in dgv_Cuotas.Rows)
            {
                if (Convert.ToDecimal(dgv_Cuotas.Rows[row.Index].Cells[17].Value) == 0)
                {
                    dgv_Cuotas.Rows[row.Index].Cells[16].Visible = false;
                }
            }

Obviously this does not works, I get a compiler error message saying that the property is read only.

Does somebody knows how to set the checkbox cell to invisible?

Just in case, I attach the DataGridViewCheckboxColumn creation code:

DataGridViewCheckBoxColumn chbox = new DataGridViewCheckBoxColumn();
            {
                chbox.CellTemplate = new DataGridViewCheckBoxCell();
                chbox.HeaderText = "";
                chbox.Name = "Seleccionar";
                chbox.AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
                chbox.FlatStyle = FlatStyle.Standard;
            }
            dgv_Cuotas.Columns.Insert(16, chbox);
            dgv_Cuotas.Columns[16].DisplayIndex = 0;

EDIT:

Some considerations:

I use the cell content click event to handle the checkboxes, so readonly wont work. What I want is to hide the checkbox:

private void dgv_Cuotas_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex == -1)
            return;
        if (dgv_Cuotas.Columns[e.ColumnIndex].Name == "Seleccionar")
        {
            DataGridViewRow row = dgv_Cuotas.Rows[e.RowIndex];
            DataGridViewCheckBoxCell cellSeleccion = row.Cells["Seleccionar"] as DataGridViewCheckBoxCell;
            int n_cuota = Convert.ToInt32(dgv_Cuotas[2, dgv_Cuotas.CurrentRow.Index].Value);
            Cuota cuota_seleccionada = new Cuota();
            cuota_seleccionada = Lista_cuotas.Where(x => x.num_cuota == n_cuota).First();

            if (cellSeleccion != null && Convert.ToBoolean(cellSeleccion.Value) == true)
            {
                cellSeleccion.Value = false;
                Actualizar_cuotas_seleccionadas(false, cuota_seleccionada);
            }
            else
            {
                if (cellSeleccion != null && Convert.ToBoolean(cellSeleccion.Value) == false)
                {
                    cellSeleccion.Value = true;
                    Actualizar_cuotas_seleccionadas(true, cuota_seleccionada);
                }
            }
        }

In the other hand, I´m already using the Onpaint event. Its inherited, thats why I´m trying to avoid using it.

Answer 1

Yes, you can do this by Converting the DataGridViewCheckBoxCell to DataGridViewTextBoxCell

        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (dataGridView1.Rows[row.Index].Cells[17].EditedFormattedValue.ToString().Length == 0) //  if (string.IsNullOrWhiteSpace(dataGridView1.Rows[row.Index].Cells[4].EditedFormattedValue.ToString()))
                break; 
            if (Convert.ToDecimal(dataGridView1.Rows[row.Index].Cells[17].EditedFormattedValue) == 0)
            {
                dataGridView1.Rows[row.Index].Cells[16].Value = null;
                dataGridView1.Rows[row.Index].Cells[16] = new DataGridViewTextBoxCell();

            }
            else
            {
                //dgv_Cuotas.Rows[row.Index].Cells[16] = new DataGridViewCheckBoxCell();
            }
        }