ATMLCommonLibrary.utils.SignalCalculator.btnPlusMinus_Click C# (CSharp) Method

        private void btnPlusMinus_Click(object sender, EventArgs e)
        {
            var dv = edtDisplay.Tag as DisplayValue;
            string value = dv.Prefix;
            if (value.StartsWith("+"))
                value = value.Replace("+", "-");
            else if (value.StartsWith("-"))
                value = value.Replace("-", "±");
            else if (value.StartsWith("±"))
                value = value.Replace("±", "");
            else
                value = "+" + value;

            dv.Prefix = value;
            edtDisplay.Text = dv.ToString();
            DisplayPhysicalParts();
        }