private void btBack_Click(object sender, EventArgs e)
{
Form2_Salaries f = Form2_Salaries.GetInstance;
f.Show();
this.Hide(); //hiding investment tex credit form
}
private void btNext_Click(object sender, EventArgs e)
{
UserInputs_PersonInformation();
Form2_Salaries f = Form2_Salaries.GetInstance;
f.Show();
this.Hide(); // form1 hide
}