private void RolesForm_Load(object sender, EventArgs e)
{
var bindingSource = new BindingSource();
var rolesTable = rolesManager.BuscarTodos();
rolesDataGridView.DataSourceChanged += new EventHandler(rolesDataGridView_DataSourceChanged);
rolesDataGridView.AutoGenerateColumns = false;
rolesDataGridView.DataSource = rolesTable;
}