private void btnSave_Click(object sender, RoutedEventArgs e)
{
Maintenace nwMaintenace = new Maintenace()
{
AmountPaid = Convert.ToDecimal(txtAmount.Text),
CarID = Convert.ToByte(cmbCarReg.SelectedValue),
Date = Convert.ToDateTime(dtpDate.SelectedDate),
Description = txtDescription.Text,
InstructorID = Convert.ToInt32(cmbInstructor.SelectedValue),
InvoiceNumber = txtInvoice.Text,
TypeID = Convert.ToByte(cmbType.SelectedValue),
Notes = txtNotes.Text
//UserID=
};
DbInsert.InsertMaintenaceData(nwMaintenace);
LoadDataGrid();
MessageBox.Show("Vehicle Added", "NEW VEHICLE", MessageBoxButton.OK, MessageBoxImage.Information);
}