private void btBack_Click(object sender, EventArgs e)
{
Form5_Expenses f = Form5_Expenses.GetInstance;
f.Show();
this.Hide();
}
private void btNext_Click(object sender, EventArgs e)
{
//save data for pdf file
UserInputs_StatementOfSalary();
Form5_Expenses f = Form5_Expenses.GetInstance;
f.Show();
this.Hide(); //Hide curent window form
}