ASP.NET Tutorial/ASP.net Controls/Panel

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Hide, show panel

<%@Page language="c#" runat="server" %>
<script runat="server">
protected void Page_Load(object o, EventArgs e) {
    step1.Visible = false;
    step2.Visible = false;
    step3.Visible = false;
    if(!IsPostBack) {
        step1.Visible = true;
        return;
    }
}
protected void ClickStep1(object o, EventArgs e) {
    step2.Visible = true;
}
protected void ClickStep2(object o, EventArgs e) {
    theFinalName.Text = theName.Text;
    theFinalHobby.Text = theHobby.Text;
    step3.Visible = true;
}
</script>
<form runat="server">
<asp:panel id="step1" runat="server">
Name: <asp:textbox id="theName" runat="server" />
<asp:button type="submit" id="submitStep1" runat="server" Text="Go" onClick="ClickStep1"/>
</asp:panel>
<asp:panel id="step2" runat="server">
Hobby: <asp:textbox id="theHobby" runat="server"/>
<asp:button type="submit" id="submitStep2" runat="server" Text="Go" onclick="ClickStep2" />
</asp:panel>
<asp:panel id="step3" runat="server">
Done!<br />
Name: <asp:label id="theFinalName" runat="server" /><br/>
Hobby: <asp:label id="theFinalHobby" runat="server" /><br/>
</asp:panel>
</form>


Important properties, methods and events of Panel control

DefaultButton:     the default button in a Panel. The default button is invoked when you press the Enter button.
Direction:         direction in which controls that display text are rendered. 
                   Possible values are NotSet, LeftToRight, and RightToLeft.
GroupingText:      render the Panel control as a fieldset with a particular legend.
HorizontalAlign:   horizontal alignment of the contents of the Panel. 
                   Possible values are Center, Justify, Left, NotSet, and Right.
ScrollBars:        display scrollbars around the panel"s contents. 
                   Possible values are Auto, Both, Horizontal, None, and Vertical.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Panel Grouping Text</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Panel
        id="pnlContact"
        GroupingText="Contact Information"
        Runat="server">
    <asp:Label
        id="lblFirstName"
        Text="First Name:"
        AssociatedControlID="txtFirstName"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtFirstName"
        AutoCompleteType="FirstName"
        Runat="server" />
    <br /><br />
    <asp:Label
        id="lblLastname"
        Text="Last Name:"
        AssociatedControlID="txtLastName"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtLastName"
        AutoCompleteType="LastName"
        Runat="server" />
    <br /><br />
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />
    </asp:Panel>
    </div>
    </form>
</body>
</html>


Set AssociatedControlID for asp:Panel

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs)
        If rdlOther.Checked Then
            pnlOther.Visible = True
        Else
            pnlOther.Visible = False
        End If
    End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Panel</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    Select your favorite programming language:
    <br /><br />
    <asp:RadioButton
        id="rdlVisualBasic"
        GroupName="language"
        Text="Visual Basic"
        Runat="server" />
    <br /><br />
    <asp:RadioButton
        id="rdlCSharp"
        GroupName="language"
        Text="C#"
        Runat="server" />
    <br /><br />
    <asp:RadioButton
        id="rdlOther"
        GroupName="language"
        Text="Other Language"
        Runat="server" />
    <br />    
    <asp:Panel
        id="pnlOther"
        Visible="false"
        Runat="server">
        
        <asp:Label
            id="lblOther"
            Text="Other Language:"
            AssociatedControlID="txtOther"
            Runat="server" />
        <asp:TextBox
            id="txtOther"
            Runat="server" />    
        
    </asp:Panel>
    
    <br /><br />
    
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        OnClick="btnSubmit_Click" 
        Runat="server" />
    
    </div>
    </form>
</body>
</html>


The Panel control enables you to work with a group of ASP.NET controls: show or hide

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        if (rdlOther.Checked)
            pnlOther.Visible = true;
        else
            pnlOther.Visible = false;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Panel</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Select your favorite programming language:
    <br /><br />
    <asp:RadioButton
        id="rdlVisualBasic"
        GroupName="language"
        Text="Visual Basic"
        Runat="server" />
    <br /><br />
    <asp:RadioButton
        id="rdlCSharp"
        GroupName="language"
        Text="C#"
        Runat="server" />
    <br /><br />
    <asp:RadioButton
        id="rdlOther"
        GroupName="language"
        Text="Other Language"
        Runat="server" />
    <br />
    <asp:Panel
        id="pnlOther"
        Visible="false"
        Runat="server">
        <asp:Label
            id="lblOther"
            Text="Other Language:"
            AssociatedControlID="txtOther"
            Runat="server" />
        <asp:TextBox
            id="txtOther"
            Runat="server" />
    </asp:Panel>
    <br /><br />
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" OnClick="btnSubmit_Click" />
    </div>
    </form>
</body>
</html>


The ScrollBars property enables you to display scrollbars around a panel

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        for (int i = 0; i < 100; i++)
            bltList.Items.Add("Item " + i.ToString());
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <style type="text/css">
        html
        {
            background-color:silver;
        }
        .contents
        {
            background-color:white;
            width:200px;
            height:200px;
        }
    </style>
    <title>Panel ScrollBars</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Panel
        id="pnlContent"
        ScrollBars="Auto"
        CssClass="contents"
        Runat="server">
        <asp:BulletedList
            id="bltList"
            Runat="server" />
    </asp:Panel>
    </div>
    </form>
</body>
</html>


Use asp:panel to host asp.net controls

<html><body>
   <form runat="server">
      <asp:Panel id="Panel1" runat="server">
         <tr>
            <td width="100" valign="top">First and last name:
            </td>
            <td width="300" valign="top">
               <asp:TextBox id="tbFName" runat="server" />
               <asp:TextBox id="tbLName" runat="server" />
            </td>
         </tr>
         <tr>
            <td valign="top">Email:</td>
            <td valign="top">
               <asp:TextBox id="tbEmail" runat="server" />
            </td>
         </tr>
         <tr>
            <td valign="top">Address:</td>
            <td valign="top">
               <asp:TextBox id="tbAddress" runat="server" />
            </td>
         </tr>
         <tr>
            <td valign="top">City, State, ZIP:</td>
            <td valign="top">
               <asp:TextBox id="tbCity" runat="server" />,
               <asp:TextBox id="tbState" runat="server" size=2 />&nbsp;
               <asp:TextBox id="tbZIP" runat="server" size=5 />
            </td>
         </tr>
         <tr>
            <td valign="top">Phone:</td>
            <td valign="top">
               <asp:TextBox id="tbPhone" runat="server" size=11 />
            </td>
         </tr>
         <tr>
            <td colspan="2" valign="top" align="right">
               <asp:Button id="btSubmit" runat="server" text="Add"/>
            </td>
         </tr>
      </asp:Panel>
   </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.net_Controls/Panel&oldid=3343»