文字与标签

Yep, the main difference is that Literal controls just render out text, but Label controls surround it with <span> tags (Unless you use the AssociatedControlID property, in which case a Label control will render a <label> tag).

So, labels can be styled easier, but if you're just inserting text, literals are the way to go. Literal controls also have a handy property Mode which governs how the text is rendered. You can have it HTML-encoded, or rendered without any changes, or have any "unsupported markup-language elements" removed.

If you're not applying any styles (e.g. by using Label's CssClass property), it will be fine to replace Label controls with Literal controls.

When you have code similar to

<asp:Label EnableViewState="false" ID="Label8" runat="server"
AssociatedControlID="txtEmail">Email Address:</asp:Label>


<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>

It is optimal to use a label element because it will correctly turn it into a html label element with the correct for attribute targeting your text box, so that if a user clicks on the label it automatically sets their cursor inside the text field.

Otherwise use the literal unless having the text wrapped in a span would be beneficial for css styling.

To display simple text, formatted text or HTML text as it is i will start with literal first as its lightweight and does not emit out extra SPAN tags.

See this video which demonstrates about those extra tags.

But we can not apply CSS on a literal , we can not add attributes like Label1.Attributes.Add to a literal. Any container oriented things can not be achieved as literal is not surrounded by a SPAN tag.

It's also sad to see lot of ASP.NET Webform guys by default choose label to display text not knowing that it generates extra SPAN tags which can make your HTML heavy if you have lot's of label.

Difference b/w Label and Literal Control in asp.net

In almost all ways a Literal control is the same as a Label control. Both of these controls are used to display Text on a webform. (The Text property can be set in the HTML or in the code-behind.)

The biggest difference is that the Label control wraps the text in a span when rendered. Any style that is applied to the Label control, will be rendered using the style property of the span.

For example, the following HTML

<asp:Label ID="Label1" runat="server"  Text="Label Text"
ForeColor="Red" Font-Bold="true" ></asp:Label>

Will be rendered as

<span id="Label1" style="color:Red;font-weight:bold;">Label Text</span>

A Literal control doesn't output any surrounding tags, so the Text is displayed as is:

For example, the following HTML

<asp:Literal ID="Literal1" runat="server"
Text="Literal Control Text"></asp:Literal>

will be rendered as

Literal Control Text

So if you want to apply any styles to a than use Label control otherwise use the Literal control. Because of this, the Literal control is a light weight control, when compared with the Label control.

FYI: The inheritance hierarchy for Literal control class is (Object => Control => Literal), where as for the Label control, the hierarchy is (Object => Control => WebControl=> Label)