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<script runat="server" language="C#">
protected void Page_Load(object o, EventArgs e) {
if(IsPostBack) {
Page.DataBind();
}
}
protected double CalculateFactorial(int input) {
double result = 1;
for(;input > 0; input--) {
result *= input;
}
return result;
}
</script>
<form runat="server">
Databind the result of a method call.
<asp:Textbox runat="server" id="theInput" /><br/>
<asp:RequiredFieldValidator
runat="server"
ControlToValidate="theInput"
ErrorMessage="input is required" />
<asp:RangeValidator
runat="server"
ControlToValidate="theInput"
ErrorMessage="input must be >= 0 and < 20"
Type="integer"
MinimumValue="0"
MaximumValue="20" /><br/>
<asp:Button
runat="server"
type="submit"
Text="Calculate Factorial" /><br/>
The result is: <b><%# CalculateFactorial(Int32.Parse(theInput.Text)).ToString() %></b>
</form>
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