Insert into sql with - char

Question

Insert into sql with "-" char

 

using (SqlCommand cmd = new SqlCommand("INSERT INTO dbo.mp_list (iznos_sa_pdv, kupac) VALUES(@iznos_sa_pdv)", con))
{
cmd.Parameters.Add("@iznos_sa_pdv", SqlDbType.VarChar, 255).Value = ukupnolabel.Text;
}

 I have result    exp  1.00

 

How to insert into to have value -1.00

 

Thank you