The TextBox server control is an input control that lets the user enter text. By default, the TextMode property is set to SingleLine, which creates a text box with only one line. You can also set the property to MultiLine or Password. MultiLine creates a text box with more than one line. Password creates a single-line text box that masks the value entered by the user.
The display width of the text box is determined by its Columns property. If the text box is a multiline text box, the display height is determined by the Rows property. The display width can also be set by the Width property.
Use the Text property to determine the contents of the TextBox control. You can limit the number of characters that can be entered in the control by setting the MaxLength property. Set the Wrap property to true to specify that the contents of the cell should automatically continue on the next line when the end of the text box is reached.
<asp:TextBox ID="EmailText" runat="server" MaxLength="100"/>
A textbox class would render and Input of Type Text in the client HTML. 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.