private void Item_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
string display = this.txtDisplay.Text;
try
{
if (!string.IsNullOrEmpty(display) && !display.StartsWith("."))
{
FormValue = double.Parse(display);
}
}
catch (Exception ex)
{
FormValue = 0;
}
switch (btn.Tag.ToString())
{
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
case "9":
case "0":
display += btn.Tag.ToString();
break;
case ".":
if (!display.Contains("."))
{
display += ".";
}
break;
case "+1":
FormValue += 1;
display = FormValue.ToString();
break;
case "+10":
FormValue += 10;
display = FormValue.ToString();
break;
case "+100":
FormValue += 100;
display = FormValue.ToString();
break;
case "-1":
FormValue -= 1;
display = FormValue.ToString();
break;
case "-10":
FormValue -= 10;
display = FormValue.ToString();
break;
case "-100":
FormValue -= 100;
display = FormValue.ToString();
break;
case "+/-":
FormValue = FormValue * -1;
display = FormValue.ToString();
break;
case "Back":
if (display.Length > 0)
{
display = display.Substring(0, display.Length - 1);
}
break;
case "C":
display = "";
break;
default:
break;
}
this.txtDisplay.Text = display;
//Set FormValue
if (!string.IsNullOrEmpty(display) && !display.StartsWith("."))
{
FormValue = double.Parse(display);
}
}
