private void searchButton_Click(object sender, RoutedEventArgs e)
{
if (IsTextAllowed(txtSearch.Text))
{
int billNo = int.Parse(txtSearch.Text);
{
DataTable dt = billData.Search(billNo);
dgvBills.ItemsSource = dt.DefaultView;
}
}
else
{
MessageBox.Show("Enter Valid Bill Number!");
}
}