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        private void DataForm_Load(object sender, EventArgs e)
        {
            this.DataFormdataGridView.EditingControlShowing +=
               new DataGridViewEditingControlShowingEventHandler(
                   dataGridView1_EditingControlShowing);
        }

        //--
        private bool IsHandleAdded;
        
        void dataGridView1_EditingControlShowing(object sender, 
            DataGridViewEditingControlShowingEventArgs e)
        {
            if (!IsHandleAdded/* && this.DataFormdataGridView.CurrentCell.ColumnIndex == 0*/)
            {
                TextBox tx = e.Control as TextBox;
                if (tx != null)
                {
                    tx.KeyPress += new KeyPressEventHandler(tx_KeyPress);
                    this.IsHandleAdded = true;
                }
            }
        }

        
        void tx_KeyPress(object sender, KeyPressEventArgs e)
        {
                e.Handled = true;
        }