Input Controls in ASP.NET


Introduction and Demonstration

Input controls let the user enter text data into the application. ASP.NET supports only one input web control: the TextBox. The TextBox behaves like a single-line or multiline edit control, depending on the value of its TextMode property. Its simplified syntax is as follows:

<asp:textbox id="SingleText"
   text="Single Line TextBox"
   runat="server" />
 
<asp:textbox id="PasswordText"
   text="Password"
   textmode="Password"
   runat="server" />
 
<asp:textbox id="MultiText"
   text="Multiline TextBox"
   textmode="Multiline"
   runat="server" />

The TextBox control can then be accessed programmatically with a code fragment like:


SingleText.Text = "Hello ASP.NET"
PasswordText.Attributes("Value") = "New Password"
MultiText.Text = "Multiline TextBox can hold many lines of text"

Note that the text of a TextBox control using the Password text mode cannot be set directly using the Text property, but can be set using the attributes collection as shown in the preceding code snippet (though this is not recommended, since it results in the password being rendered to the client in plain text).

Index.aspx Page:


<%@ Page Language="vb" %>
<html>
<head>
   <title>Input Control Example</title>
   <script runat="server">
      Sub Page_Load( )
         SingleText.Text = "Hello ASP.NET"
         PasswordText.Attributes("Value") = "New Password"
         MultiText.Text = "Multiline TextBox can hold many lines of text"
      End Sub
   </script>
</head>
<body>
   <h1>Input Control Example</h1>
   <form runat="server">
      <table border="1" cellpadding="5" cellspacing="0">
         <tr>
            <td>
               Single Line TextBox:
            </td>
            <td>
               <asp:textbox id="SingleText"
                  text="Single Line TextBox"
                  runat="server" />
            </td>
         </tr>
         <tr>
            <td>
               Password TextBox:
            </td>
            <td>
               <asp:textbox id="PasswordText"
                  text="Password"
                  textmode="Password"
                  runat="server" />
            </td>
         </tr>
         <tr>
            <td>
               Multiline TextBox:
            </td>
            <td>
               <asp:textbox id="MultiText"
                  text="Multiline TextBox"
                  textmode="Multiline"
                  runat="server" />
            </td>
         </tr>
      </table>
   </form>
</body>
</html>

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