datagridview_CellValidating event problem

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C#3.5

private void dgvGroupDet_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
if (dgvGroupDet.Columns[e.ColumnIndex].Name == "Name")
{
if (String.IsNullOrEmpty(e.FormattedValue.ToString()))
{
dgvGroupDet.Rows[e.RowIndex].ErrorText =
"Name must not be empty";
e.Cancel = true;
}
}
}
private void dgvGroupDet_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
dgvGroupDet.Rows[e.RowIndex].ErrorText = String.Empty;
}
Note: I m trying to do this code for validation in datagridview it will work complete but due to validation i can't close my Form.