ASP.Net/Language Basics/Logical Opertors
Logical AND Example (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <script runat="server">
void Page_Load()
{
if (IsPostBack){
DateTime datInput;
datInput = Convert.ToDateTime(txtIn.Text);
if ( datInput>=Convert.ToDateTime("1/1/2005") &&
datInput<=Convert.ToDateTime("12/31/2005"))
lblOut.Text = "Date inside year 2005. " + datInput;
}
}
</script> <html> <head>
<title>Logical AND Example</title>
</head> <body>
<form runat="server">
Please enter a date, first in 2005.
Next try a date not in 2005
<asp:TextBox id="txtIn" runat="server"></asp:TextBox>
<asp:Button id="Button1" runat="server" Text="Submit"></asp:Button>
<asp:Label id="lblOut" runat="server"></asp:Label>
</form>
</body> </html>
</source>
Logical Operators in C#: "and", "or" and "not"
<source lang="csharp">
<%@ Page Language="C#" Debug="true" %> <script runat="server">
void page_Load()
{
if(Page.IsPostBack)
{
int number1, number2, number3;
number1 = Convert.ToInt32(txtNumber1.Text);
number2 = Convert.ToInt32(txtNumber2.Text);
number3 = Convert.ToInt32(txtNumber3.Text);
lblExpression.Text = "number1 == 1 || !(number1==2) && !(number2==3)";
if (number1 == 1 || !(number1==2) && !(number2==3))
lblResult.Text = "true";
else
lblResult.Text = "false";
}
}
</script> <html>
<head>
</head>
<body>
<form runat="server">
Note: only works with integers
Number1 = <asp:TextBox runat="server" ID="txtNumber1" Text=5 width=30 />
Number1 = <asp:TextBox runat="server" ID="txtNumber2" Text=2 width=30 />
Number1 = <asp:TextBox runat="server" ID="txtNumber3" Text=3 width=30 />
Press to see result<asp:Button runat="server" Text="Submit"/>
Logical expression is:<asp:Label runat="server" ID="lblExpression"/>
Logical expression result is:<asp:Label runat="server" ID="lblResult"/>
</form>
</body>
</html>
</source>
