private void initializeColumnWidths()
{
    foreach (DataGridViewColumn Col in customerDataGridView.Columns)
    {
        if (Col is DataGridViewTextBoxColumn)
        {

            if (Col.ValueType == typeof(System.String))
            {
                int maxlen = customerDataset.customer.Columns[Col.DataPropertyName].MaxLength;
                Col.HeaderText += string.Format("({0})", maxlen);
                (Col as DataGridViewTextBoxColumn).MaxInputLength = maxlen;
            }
        }
    }
}