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<%@ Page Language="C#" %>
<%@ Register TagPrefix="mono" TagName="MonoSamplesHeader" src="~/controls/MonoSamplesHeader.ascx" %>
<html>
<script runat=server>
void Clicked (object o, EventArgs e)
{
if (!Page.IsValid)
return;
double val;
try {
val = Double.Parse (degrees.Text);
} catch (Exception) {
result.Text = "<font color=\"red\">Invalid number in degrees</font>";
return;
}
double kval;
switch (fromScale.SelectedIndex) {
case 0:
kval = val + 373;
break;
case 1:
kval = 373 + (val - 32) * 5 / 9;
break;
case 2:
if (val < 0) {
result.Text = "<font color=\"red\">Kelvin is not defined for negtive numbers</font>";
return;
}
kval = val;
break;
default:
result.Text = "<font color=\"red\">Invalid from index</font>";
return;
}
switch (toScale.SelectedIndex) {
case 0:
kval -= 373;
break;
case 1:
kval = ((kval - 373) * 9 / 5) + 32;
break;
case 2:
// Do nothing
break;
default:
result.Text = "<font color=\"red\">Invalid from index</font>";
return;
}
result.Text = String.Format ("Converting {0} from {1} to {2} gives <b>{3}</b>",
val,
fromScale.Value,
toScale.Value,
Math.Round (kval, 3));
}
</script>
<head>
<link rel="stylesheet" type="text/css" href="/mono-xsp.css">
<title>Temperature conversion</title>
</head>
<body><mono:MonoSamplesHeader runat="server"/>
<h3>Temperature conversion</h3>
Choose to/from and enter degrees.
<form runat="server">
<span>From: </span>
<select id="fromScale" runat="server">
<option selected="true">Celsius</option>
<option>Farenheit</option>
<option>Kelvin</option>
</select>
<span>Degrees: </span>
<asp:TextBox id="degrees" Text="" runat="server" />
<span>To: </span>
<select id="toScale" runat="server">
<option>Celsius</option>
<option selected="true">Farenheit</option>
<option>Kelvin</option>
</select>
<p>
<asp:Label runat=server id="result" Text="" />
<p>
<asp:Button id="btn"
Text="Calculate"
OnClick="Clicked"
runat="server"/>
<p>
<asp:RequiredFieldValidator runat="server" id="vDegrees"
ControlToValidate="degrees" display="Dynamic"
ErrorMessage="Degrees not filled!" />
</form>
</body>
</html>
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