Table Class (System.Web.UI.WebControls)

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Table Class

Displays a table on a Web page.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class Table _
    Inherits WebControl _
    Implements IPostBackEventHandler

Visual Basic (Usage)

Dim instance As Table

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class Table : WebControl, IPostBackEventHandler

Visual C++

[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction::InheritanceDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class Table : public WebControl, 
    IPostBackEventHandler

JScript

public class Table extends WebControl implements IPostBackEventHandler

ASP.NET

<asp:Table />

Remarks

The Table control allows you to build an HTML table and specify its characteristics in a straightforward manner. A table can be built at design time given some static content, but the power of a Table Web server control is often realized when the table is built programmatically with dynamic contents.

It is important to remember that any programmatic addition or modification of table rows or cells will not persist across posts to the server. This is because table rows and cells are controls of their own, and not properties of the Table control. To persist any changes to the table, rows and cells must be reconstructed after each postback. In fact, if substantial modifications are expected, it is recommended that a DataList, DataGrid, or GridView control be used instead of the Table control. As a result, the Table class is primarily used by control developers.

Caution:
This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.

Caution:

This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.

Accessibility

The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.

Topic	Location
How to: Add and Remove HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
How to: Add and Remove HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
How to: Add and Remove HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
How to: Add Rows and Cells Dynamically to a Table Web Server Control	Building ASP .NET Web Applications
How to: Add Rows and Cells Dynamically to a Table Web Server Control	Building ASP .NET Web Applications
How to: Add Rows and Cells Dynamically to a Table Web Server Control	Building ASP .NET Web Applications in Visual Studio
How to: Add Rows and Cells Dynamically to a Table Web Server Control	Building ASP .NET Web Applications in Visual Studio
How to: Add Table Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add Table Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add Table Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add Table Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add Table Web Server Controls to a Web Forms Page (Visual Studio)	Building ASP .NET Web Applications in Visual Studio
How to: Resize HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
How to: Resize HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
How to: Resize HTML Table Elements	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building Applications with Visual Web Developer
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Editing HTML Tables	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Editing HTML Tables	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Editing HTML Tables	Building ASP .NET Web Applications in Visual Studio

Examples

The following code example demonstrates how to create a table at design time. The table contains two rows of two cells each.

Note:
The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model.

Visual Basic

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html  >
<head runat="server">
    <title>Table Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Table example, constructed at design time</h3>
    <asp:Table id="Table1" runat="server"
        CellPadding="10" 
        GridLines="Both"
        HorizontalAlign="Center">
        <asp:TableRow>
            <asp:TableCell>
                Row 0, Col 0
            </asp:TableCell>
            <asp:TableCell>
                Row 0, Col 1
            </asp:TableCell>
        </asp:TableRow>
        <asp:TableRow>
            <asp:TableCell>
                Row 1, Col 0
            </asp:TableCell>
            <asp:TableCell>
                Row 1, Col 1
            </asp:TableCell>
        </asp:TableRow>
    </asp:Table>

    </div>
    </form>
</body>
</html>

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html  >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Table example, constructed at design time</h3>
    <asp:Table id="Table1" runat="server"
        CellPadding="10" 
        GridLines="Both"
        HorizontalAlign="Center">
        <asp:TableRow>
            <asp:TableCell>
                Row 0, Col 0
            </asp:TableCell>
            <asp:TableCell>
                Row 0, Col 1
            </asp:TableCell>
        </asp:TableRow>
        <asp:TableRow>
            <asp:TableCell>
                Row 1, Col 0
            </asp:TableCell>
            <asp:TableCell>
                Row 1, Col 1
            </asp:TableCell>
        </asp:TableRow>
    </asp:Table>

    </div>
    </form>
</body>
</html>

The following code example demonstrates how to construct a table programmatically. Creating a table dynamically consists of three steps. First, create TableCell objects to represent the cells in a row. Content for the cells is added by either setting the Text property or by adding controls to the Control..::.Controls collection of the TableCell. Next, create a TableRow to represent a row in the table. Add the TableCell objects created earlier to the Cells collection of the TableRow. Finally, add the TableRow to the Rows collection of the Table control. Repeat this process for each row in the table.

Visual Basic

<%@ 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 Page_Load(sender As Object, e As EventArgs)
        ' Generate rows and cells.           
        Dim numrows As Integer = 3
        Dim numcells As Integer = 2
        Dim j As Integer
        For j = 0 To numrows - 1
            Dim r As New TableRow()
            Dim i As Integer
            For i = 0 To numcells - 1
                Dim c As New TableCell()
                c.Controls.Add(New LiteralControl("row " & j.ToString() & ", cell " & i.ToString()))
                r.Cells.Add(c)
            Next i
            Table1.Rows.Add(r)
        Next j
    End Sub 'Page_Load
</script>
<html  >
<head runat="server">
    <title>Programmatic Table Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Table Example, constructed programmatically</h3>
    <asp:Table id="Table1" 
        GridLines="Both" 
        HorizontalAlign="Center" 
        Font-Names="Verdana" 
        Font-Size="8pt" 
        CellPadding="15" 
        CellSpacing="0" 
        Runat="server"/>

    </div>
    </form>
</body>
</html>

<%@ 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">

    private void Page_Load(Object sender, EventArgs e)
    {
        // Generate rows and cells.           
        int numrows = 3;
        int numcells = 2;
        for (int j = 0; j < numrows; j++)
        {          
            TableRow r = new TableRow();
            for (int i = 0; i < numcells; i++) {
                TableCell c = new TableCell();
                c.Controls.Add(new LiteralControl("row " 
                    + j.ToString() + ", cell " + i.ToString()));
                r.Cells.Add(c);
            }
            Table1.Rows.Add(r);
        }
    }

</script>

<html  >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Table Example, constructed programmatically</h3>
    <asp:Table id="Table1" 
        GridLines="Both" 
        HorizontalAlign="Center" 
        Font-Names="Verdana" 
        Font-Size="8pt" 
        CellPadding="15" 
        CellSpacing="0" 
        Runat="server"/>

    </div>
    </form>
</body>
</html>

.NET Framework Security

AspNetHostingPermission
for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
AspNetHostingPermission
for operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.

Inheritance Hierarchy

System..::.Object
  System.Web.UI..::.Control
    System.Web.UI.WebControls..::.WebControl
      System.Web.UI.WebControls..::.Table

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

Table Members

System.Web.UI.WebControls Namespace

Other Resources

Table, TableRow, and TableCell Web Server Control Overview

Securing Standard Controls