ASP.Net/Language Basics/For Each
For each loop: array (VB.net)
<%@ Page Language="VB" %>
<script runat="server">
Dim ColorList(6) as String
Sub Page_Load
ColorList(0) = "Red"
ColorList(1) = "Orange"
ColorList(2) = "Yellow"
ColorList(3) = "Green"
ColorList(4) = "Blue"
ColorList(5) = "Indigo"
ColorList(6) = "Violet"
Array.Sort(ColorList)
If Not Page.IsPostback
Dim ColorName as String
For Each ColorName in ColorList
ddlColorList.Items.Add(ColorName)
Next
End If
End Sub
Sub btnSelectColor_Click(sender As Object, e As EventArgs)
lblOutputMessage.Text = "You selected " & ddlColorList.SelectedItem.Value
lblOutputMessage.ForeColor = _
System.Drawing.Color.FromName(ddlColorList.SelectedItem.Text)
End Sub
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<p>
Select a color from the list:<asp:DropDownList id="ddlColorList" runat="server"></asp:DropDownList>
<asp:Button id="btnSelectColor" onclick="btnSelectColor_Click" runat="server" Text="Click here!"></asp:Button>
</p>
<p>
<asp:Label id="lblOutputMessage" runat="server"></asp:Label>
</p>
</form>
</body>
</html>
For each loop for string (C#)
<%@ Page Language="C#" %>
<script runat="server">
void page_Load()
{
string[] arrCities = new string[3];
arrCities[0]=("A");
arrCities[1]=("B");
arrCities[2]=("C");
foreach (string item in arrCities) {
lblOut.Text += item + "<BR>";
}
}
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<asp:Label runat="server" ID="lblOut"/><br/>
</form>
</body>
</html>
For each loop to reverse a string (VB.net)
<%@ Page Language="VB" %>
<script runat="server">
Function ValidateCard(cardNumber As String) As Boolean
Dim reverseNumber As String
Dim ch As Char
For Each ch in cardNumber
reverseNumber = ch & reverseNumber
Next
Dim doubledAlternates As String
Dim thisDigit, index As Integer
For index = 1 to reverseNumber.Length
thisDigit = CInt(reverseNumber.SubString(index - 1, 1))
If index mod 2 = 0 Then
thisDigit = thisDigit * 2
End If
doubledAlternates = doubledAlternates & thisDigit
Next
Dim sum As Integer
For index = 1 to doubledAlternates.Length
sum = sum + CInt(doubledAlternates.SubString(index - 1, 1))
Next
ValidateCard = sum <> 0 AND sum mod 10 = 0
End Function
Sub Button1_Click(sender As Object, e As EventArgs)
If ValidateCard(TextBox1.Text) Then
Label1.Text = "That"ll do nicely sir!"
Else
Label1.Text = "There"s nothing for you here!"
End If
End Sub
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<p>
Enter the number:
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
</p>
<p>
<asp:Button id="Button1" onclick="Button1_Click" runat="server" Text="Check Card Number"></asp:Button>
</p>
<p>
<asp:Label id="Label1" runat="server"></asp:Label>
</p>
</form>
</body>
</html>