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ASP.Net/Language Basics/If Statement - История изменений
2026-04-30T07:59:21Z
История изменений этой страницы в вики
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http://nfex.ru/index.php?title=ASP.Net/Language_Basics/If_Statement&diff=2205&oldid=prev
в 15:30, 26 мая 2010
2010-05-26T15:30:47Z
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http://nfex.ru/index.php?title=ASP.Net/Language_Basics/If_Statement&diff=2206&oldid=prev
Admin: 1 версия
2010-05-26T11:53:23Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==If else Demo (C#)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<script runat="server"><br />
void page_Load()<br />
{<br />
if(Page.IsPostBack)<br />
{<br />
if(chkIsMember.Checked==true){<br />
lblOut.Text = "Members get a free ticket";<br />
lblOut.BackColor=System.Drawing.Color.LightPink;<br />
}<br />
else if(Convert.ToInt32(txtAge.Text)<=18) {<br />
lblOut.Text = "Students get a free ticket";<br />
lblOut.BackColor=System.Drawing.Color.LightPink;<br />
}else {<br />
lblOut.Text = "Price is 500";<br />
lblOut.BackColor=System.Drawing.Color.LightSeaGreen;<br />
}<br />
}<br />
}<br />
</script><br />
<html><br />
<head><br />
</head><br />
<body><br />
<br /><br />
<form runat="server"><br />
Please enter your age <br />
<asp:TextBox id="txtAge" runat="server"></asp:TextBox><br />
<br /><br />
Are you a member? <br />
<asp:CheckBox id="chkIsMember" runat="server"></asp:CheckBox><br />
<asp:Button id="Button1" runat="server" Text="Submit"></asp:Button><br />
<br /><br />
<asp:Label id="lblOut" runat="server"></asp:Label><br />
<br /><br />
</form><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==If statement the check the input value from asp:TextBox (VB.net)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="VB" %><br />
<script runat="server"><br />
Sub Reset()<br />
<br />
Textbox1.Text = ""<br />
Textbox2.Text = "0"<br />
<br />
End Sub<br />
<br />
Sub Page_Load(sender As Object, e As EventArgs)<br />
<br />
If Not Page.IsPostback<br />
Reset()<br />
End If<br />
<br />
End Sub<br />
<br />
Sub btnSubmit_Click(sender As Object, e As EventArgs)<br />
<br />
If cint(textbox2.text) < 20 Then<br />
<br />
label1.text = "Hi " & textbox1.text & ", you are " & textbox2.text & ", which is young!"<br />
<br />
Else If cint(textbox2.text) < 40 Then<br />
<br />
label1.text = "Hi " & textbox1.text & ", you are " & textbox2.text & ", which means you"re middle-aged!"<br />
<br />
Else <br />
<br />
label1.text = "Hi " & textbox1.text & ", you"re old!"<br />
<br />
End If<br />
<br />
End Sub<br />
<br />
Sub btnReset_Click(sender As Object, e As EventArgs)<br />
<br />
Reset()<br />
<br />
End Sub<br />
</script><br />
<html><br />
<head><br />
</head><br />
<body><br />
<form runat="server"><br />
<p><br />
Enter your name: <br />
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox><br />
</p><br />
<p><br />
Enter you age: <br />
<asp:TextBox id="TextBox2" runat="server"></asp:TextBox><br />
</p><br />
<p><br />
<asp:Button id="btnSubmit" onclick="btnSubmit_Click" runat="server" Text="Submit"></asp:Button><br />
&nbsp; <br />
<asp:Button id="btnReset" onclick="btnReset_Click" runat="server" Text="Reset"></asp:Button><br />
</p><br />
<p><br />
<asp:Label id="Label1" runat="server"></asp:Label><br />
</p><br />
</form><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==If then Demo (C#)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<script language="C#" runat="server"> <br />
void Page_Load()<br />
{ <br />
int intNumber, intGuess;<br />
Random r = new Random();<br />
intNumber = Convert.ToInt32(r.Next(10)) + 1;<br />
if (Page.IsPostBack) {<br />
intGuess = Convert.ToInt32(Guess.SelectedItem.Value);<br />
<br />
if (intGuess > intNumber) {<br />
Message.Text = "<BR><BR>Guess is too high<BR>Try again, it was " <br />
+ intNumber;<br />
}<br />
if (intGuess < intNumber) {<br />
Message.Text = "<BR><BR>Guess is too low<BR>Try again, it was " <br />
+ intNumber;<br />
}<br />
if (intGuess == intNumber) {<br />
Message.Text = "<BR><BR>Guess is correct!";<br />
}<br />
}<br />
}<br />
</script><br />
<html><br />
<head></head><br />
<body><br />
<form runat="server"><br />
Guess?<br />
<asp:dropdownlist id="Guess" runat="server"><br />
<asp:listitem>1</asp:listitem><br />
<asp:listitem>2</asp:listitem><br />
<asp:listitem>3</asp:listitem><br />
<asp:listitem>4</asp:listitem><br />
<asp:listitem>5</asp:listitem><br />
<asp:listitem>6</asp:listitem><br />
<asp:listitem>7</asp:listitem><br />
<asp:listitem>8</asp:listitem><br />
<asp:listitem>9</asp:listitem><br />
<asp:listitem>10</asp:listitem><br />
</asp:dropdownlist><br />
<br><br />
<br> <br />
<input type="submit" value="Submit guess"><br />
<asp:label id="Message" runat="server"/><br />
</form><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==Multiple conditions in If statement (VB.net)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="VB" %><br />
<script runat="server"><br />
Sub Calendar1_SelectionChanged(sender As Object, e As EventArgs)<br />
If Day (Calendar1.SelectedDate) = 13 And Calendar1.SelectedDate.DayOfWeek = 5 Then<br />
Label1.Text = "Careful! Friday 13th is an unlucky day for some people!"<br />
Else<br />
Label1.Text = "It"s just another day in life..."<br />
End If<br />
End Sub<br />
</script><br />
<html><br />
<head><br />
</head><br />
<body><br />
<form runat="server"><br />
<p><br />
Please select a date:<br />
</p><br />
<p><br />
<asp:Calendar id="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar><br />
</p><br />
<p><br />
<asp:Label id="Label1" runat="server"></asp:Label><br />
</p><br />
</form><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==Nested if statement (C#)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<script language="C#" runat="server"> <br />
void Page_Load()<br />
{ <br />
int intNumber, intGuess;<br />
Random r = new Random();<br />
intNumber = Convert.ToInt32(r.Next(10)) + 1;<br />
if (Page.IsPostBack) {<br />
intGuess = Convert.ToInt32(Guess.SelectedItem.Value);<br />
<br />
if (intGuess > intNumber) {<br />
Message.Text = "<BR><BR>Guess is too high<BR>Try again, it was " <br />
+ intNumber;<br />
}<br />
if (intGuess < intNumber) {<br />
Message.Text = "<BR><BR>Guess is too low<BR>Try again, it was " <br />
+ intNumber;<br />
}<br />
if (intGuess == intNumber) {<br />
Message.Text = "<BR><BR>Guess is correct!";<br />
}<br />
}<br />
}<br />
</script><br />
<html><br />
<head></head><br />
<body><br />
<form runat="server"><br />
What number am I thinking of?<br />
<asp:dropdownlist id="Guess" runat="server"><br />
<asp:listitem>1</asp:listitem><br />
<asp:listitem>2</asp:listitem><br />
<asp:listitem>3</asp:listitem><br />
<asp:listitem>4</asp:listitem><br />
<asp:listitem>5</asp:listitem><br />
<asp:listitem>6</asp:listitem><br />
<asp:listitem>7</asp:listitem><br />
<asp:listitem>8</asp:listitem><br />
<asp:listitem>9</asp:listitem><br />
<asp:listitem>10</asp:listitem><br />
</asp:dropdownlist><br />
<br><br />
<br> <br />
<input type="submit" value="Submit guess"><br />
<asp:label id="Message" runat="server"/><br />
</form><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==Nested if statement (VB.net)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<script language="vb" runat="server"> <br />
Sub Page_Load()<br />
Dim theNumber As Integer<br />
Dim theGuess As Integer<br />
theNumber = int(10 * rnd) + 1<br />
If Page.IsPostBack Then<br />
theGuess = Guess.SelectedItem.Value<br />
If theGuess > theNumber then<br />
Message.Text = "<BR><BR>Guess is too high<BR>Try again ?it was " _<br />
& theNumber<br />
End If<br />
If theGuess < theNumber then<br />
Message.Text = "<BR><BR>Guess is too low<BR>Try again ?it was " _<br />
& theNumber<br />
End If<br />
If theGuess = theNumber then<br />
Message.Text = "<BR><BR>Guess is correct!"<br />
End If<br />
End If<br />
End Sub<br />
</script><br />
<html><br />
<head></head><br />
<body><br />
<form runat="server"><br />
What number am I thinking of?<br />
<asp:dropdownlist id="Guess" runat="server"><br />
<asp:listitem>1</asp:listitem><br />
<asp:listitem>2</asp:listitem><br />
<asp:listitem>3</asp:listitem><br />
<asp:listitem>4</asp:listitem><br />
<asp:listitem>5</asp:listitem><br />
<asp:listitem>6</asp:listitem><br />
<asp:listitem>7</asp:listitem><br />
<asp:listitem>8</asp:listitem><br />
<asp:listitem>9</asp:listitem><br />
<asp:listitem>10</asp:listitem><br />
</asp:dropdownlist><br />
<br><br />
<br> <br />
<input type="submit" value="Submit guess"><br />
<asp:label id="message" runat="server"/><br />
</form><br />
</body><br />
</html><br />
<br />
</source></div>
Admin