Here is an example: <%@ Page Language="C#" %>
<html>
<head>
<script runat="server">
private void btnCopmpareClick(object sender, EventArgs e)
{
double Number1 = 0.00;
double Number2 = 0.00;
double Maximum = 0.00;
Number1 = double.Parse(txtNumber1.Text);
Number2 = double.Parse(txtNumber2.Text);
Maximum = (Number1 < Number2) ? Number2 : Number1;
lblMessage.Text = "The maximum of " + Number1.ToString() +
" and " + Number2.ToString() +
" is " + Maximum.ToString();
}
</script>
<title>Altair Real Estate</title>
</head>
<body>
<form id="frmExercise" runat="server">
<table>
<tr>
<td>Enter a first number:</td>
<td><asp:TextBox id="txtNumber1" runat="server" /></td>
</tr>
<tr>
<td>Enter a second number:</td>
<td><asp:TextBox id="txtNumber2" runat="server" /></td>
</tr>
<tr>
<td colspan="2" align="right">
<asp:Button id="btnCompare"
Text="Compare"
OnClick="btnCopmpareClick"
runat="server" /></td>
</tr>
<tr>
<td colspan="2">
<asp:Label id="lblMessage" runat="server" /></td>
</tr>
</table>
</form>
</body>
</html>
Here is an example of testing the code:
If you want to test two conditions with two different outcomes, you can use an if...else if condition. Its formula is: if(Condition1) Statement1; else if(Condition2) Statement2; Condition1 would be checked first. If Condition1 is true, then Statement1 would execute. If Condition1 is false, then Condition2 is checked. If Condition2 is true, then Statement2 executes. Any other result would be ignored. Here is an example: <%@ Page Language="C#" %>
<html>
<head>
<script runat="server">
private void btnValidateClick(object sender, EventArgs e)
{
if( TypesOfHouses.SelectedIndex == 0 )
lblDescription.Text = "We have many low-level and high rise " +
"buildings featuring the best condos in the area.";
else if( TypesOfHouses.SelectedIndex == 1 )
lblDescription.Text = "Our townhouses are the widest " +
"you can find with various levels and rooms.";
}
</script>
<title>Altair Real Estate</title>
</head>
<body>
<h3>Altair Real Estate</h3>
<form id="frmRealEstate" runat="server">
<table>
<tr>
<td>What type of property do you want to purchase?</td>
<td>
<asp:DropDownList id="TypesOfHouses" runat="server">
<asp:ListItem>condominium</asp:ListItem>
<asp:ListItem>townhouse</asp:ListItem>
<asp:ListItem>single family</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td></td>
<td align="center">
<asp:Button id="btnValidate"
Text="Validate"
OnClick="btnValidateClick"
runat="server"></asp:Button>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label id="lblDescription" runat="server"></asp:Label>
</td>
</tr>
</form>
</body>
</html>
Here is an example of testing the web page:
Here is another example of testing the page:
Notice that only two conditions are evaluated. Any condition other than these two is not considered. Because there can be other alternatives, you can use one of the following formulas:
The first condition, Condition1, is checked. If that condition is true, Statement1 executes. If Condition1 is false, then the second condition, Condition2 is checked. If Condition2 is true, Statement2 executes. When a Condition-n is true, its corresponding statement executes. This means that you can include as many conditions as you see fit using the else if statement. If after examining all the known possible conditions you still think that there might be an unexpected condition, you can use the optional single else. Here is an example: <%@ Page Language="C#" %>
<html>
<head>
<script runat="server">
private void HouseSelected(object sender, EventArgs e)
{
if( TypesOfHouses.SelectedIndex == 0 )
lblDescription.Text = "We have many low-level and high rise " +
"buildings featuring the best condos in the area.";
else if( TypesOfHouses.SelectedIndex == 1 )
lblDescription.Text = "Our townhouses are the widest " +
"you can find with various levels and rooms.";
else if( TypesOfHouses.SelectedIndex == 2 )
lblDescription.Text = "We have many single family houses in " +
"ontemporary, classical, victorian architecture.";
else
lblDescription.Text = "We will try to assist you in making " +
"a clear choice for your new house";
}
</script>
<title>Altair Real Estate</title>
</head>
<body>
<h3>Altair Real Estate</h3>
<form id="frmRealEstate" runat="server">
<table>
<tr>
<td>What type of property do you want to purchase?</td>
<td>
<asp:DropDownList id="TypesOfHouses"
AutoPostBack="True"
OnSelectedIndexChanged="HouseSelected" runat="server">
<asp:ListItem>Condominium</asp:ListItem>
<asp:ListItem>Townhouse</asp:ListItem>
<asp:ListItem>Single Family</asp:ListItem>
<asp:ListItem>Unknown</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label id="lblDescription" runat="server"></asp:Label>
</td>
</tr>
</form>
</body>
</html>
Here is an example of testing the page:
Here
is another test of the page:
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Practical
Learning: Introducing Conditional Switches
