TLabel displays a piece of text on a Web page. The text to be displayed is set via its Text property. If Text is empty, content enclosed within the TLabel component tag will be displayed. TLabel may also be used as a form label associated with some control on the form. Since Text is not HTML-encoded when being rendered, make sure it does not contain dangerous characters that you want to avoid.
THyperLink displays a hyperlink on a page. The hyperlink URL is specified via the NavigateUrl property, and link text is via the Text property. The link target is specified via the Target property. It is also possible to display an image by setting the ImageUrl property. In this case, Text is displayed as the alternate text of the image. If both ImageUrl and Text are empty, the content enclosed within the control tag will be rendered.
TImage displays an image on a page. The image is specified via the ImageUrl property which takes a relative or absolute URL to the image file. The alignment of the image displayed is set by the ImageAlign property. To set alternate text or long description of the image, use AlternateText or DescriptionUrl, respectively.
TPanel acts as a presentational container for other control. It displays a <div> element on a page. The property Wrap specifies whether the panel's body content should wrap or not, while HorizontalAlign governs how the content is aligned horizontally and Direction indicates the content direction (left to right or right to left). You can set BackImageUrl to give a background image to the panel, and you can ste GroupingText so that the panel is displayed as a field set with a legend text. Finally, you can specify a default button to be fired when users press 'return' key within the panel by setting the DefaultButton property.
TTable displays an HTML table on a page. It is used together with TTableRow and TTableCell to allow programmatically manipulating HTML tables. The rows of the table is stored in Rows property. You may set the table cellspacing and cellpadding via the CellSpacing and CellPadding properties, respectively. The table caption can be specified via Caption whose alignment is specified by CaptionAlign. The GridLines property indicates how the table should display its borders, and the BackImageUrl allows the table to have a background image.
TTextBox displays a text box on a Web page. The content in the text box is determined by the Text property. You can create a SingleLine, a MultiLine, or a Password text box by setting the TextMode property. The Rows and Columns properties specify their dimensions. If AutoPostBack is true, changing the content in the text box and then moving the focus out of it will cause postback action.
TButton creates a click button on a Web page. The button's caption is specified by Text property. A button is used to submit data to a page. TButton raises two server-side events, Click and Command, when it is clicked on the client-side. The difference between Click and Command events is that the latter event is bubbled up to the button's ancestor controls. A Command event handler can use CommandName and CommandParameter associated with the event to perform specific actions.
Clicking on button can trigger form validation, if CausesValidationis true. And the validation may be restricted within a certain group of validator controls according to ValidationGroup.
TLinkButton is similar to TButton in every aspect except that TLinkButton is displayed as a hyperlink. The link text is determined by its Text property. If the Text property is empty, then the body content of the button is displayed (therefore, you can enclose a <img> tag within the button body and get an image button.
TImageButton is also similar to TButton, except that TImageButton displays the button as an image. The image is specified via ImageUrl, and the alternate text is specified by Text. In addition, it is possible to obtain the coordinate of the point where the image is clicked. The coordinate information is contained in the event parameter of the Click event (not Command).
TCheckBox displays a check box on a Web page. A caption can be specified via Text and displayed beside the check box. It can appear either on the right or left of the check box, which is determined by TextAlign. You may further specify attributes applied to the text by using LabelAttributes.
To determine whether the check box is checked, test the Checked property. A CheckedChanged event is raised if the state of Checked is changed between posts to the server. If AutoPostBack is true, changing the check box state will cause postback action. And if CausesValidation is also true, upon postback validation will be performed for validators within the specified ValidationGroup.
TRadioButton is similar to TCheckBox in every aspect, except that TRadioButton displays a radio button on a Web page. The radio button can belong to a specific group specified by GroupName such that only one radio button within that group can be selected at most.