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TextBox.ReadOnly Property

Gets or sets a value indicating whether the contents of the TextBox control can be changed.

[Visual Basic]
Public Overridable Property ReadOnly As Boolean
[C#]
public virtual bool ReadOnly {get; set;}
[C++]
public: __property virtual bool get_ReadOnly();
public: __property virtual void set_ReadOnly(bool);
[JScript]
public function get ReadOnly() : Boolean;
public function set ReadOnly(Boolean);

Property Value

true if the contents of the TextBox control can be changed; otherwise false. The default value is false.

Remarks

Use the ReadOnly property to specify whether the contents of the TextBox control can be changed. Setting this property to true will prevent users from entering a value or changing the existing value.

Example

[Visual Basic, C#] The following example demonstrates how to use the ReadOnly property to prevent any changes to the text displayed in the TextBox control.

[Visual Basic] 
<%@ Page Language="VB" AutoEventWireup="True" %>

<html> 

<head>

   <script runat="server">

      Protected Sub SubmitButton_Click(sender As Object, e As EventArgs )
               
         Message.Text = "Thank you for your comment: <br>" + Comment.Text

      End Sub

      Protected Sub Check_Change(sender As Object, e As EventArgs )
         
         Comment.Wrap = WrapCheckBox.Checked
         Comment.ReadOnly = ReadOnlyCheckBox.Checked

      End Sub

   </script>

</head>

<body>

   <form runat="server">

      <h3> MultiLine TextBox Example </h3>

      
      Please enter a comment and click the submit button. 

      <br><br> 
            
      <asp:TextBox ID="Comment"
           TextMode="MultiLine"
           Columns="50"
           Rows="5"
           runat="server"/>

      <br>

      <asp:RequiredFieldValidator
           ID="Value1RequiredValidator"
           ControlToValidate="Comment"
           ErrorMessage="Please enter a comment.<br>"
           Display="Dynamic"
           runat="server"/>                         

      <asp:CheckBox ID="WrapCheckBox"
           Text="Wrap Text"
           Checked="True"
           AutoPostBack="True"
           OnCheckedChanged="Check_Change"
           runat="server"/>

      &nbsp;&nbsp;

      <asp:CheckBox ID="ReadOnlyCheckBox"
           Text="ReadOnly"
           Checked="False"
           AutoPostBack="True"
           OnCheckedChanged="Check_Change"
           runat="server"/>

      &nbsp;&nbsp;

      <asp:Button ID="SubmitButton"
           Text="Submit"
           OnClick="SubmitButton_Click"
           runat="server"/>

      <hr>

      <asp:Label ID="Message"
           runat="server"/>

   </form>

</body>
</html>

[C#] 
<%@ Page Language="C#" AutoEventWireup="True" %>

<html> 

<head>

   <script runat="server">

      protected void SubmitButton_Click(Object sender, EventArgs e)
      {
         
         Message.Text = "Thank you for your comment: <br>" + Comment.Text;

      }

      protected void Check_Change(Object sender, EventArgs e)
      {
         
         Comment.Wrap = WrapCheckBox.Checked;
         Comment.ReadOnly = ReadOnlyCheckBox.Checked;

      }

   </script>

</head>

<body>

   <form runat="server">

      <h3> MultiLine TextBox Example </h3>

      
      Please enter a comment and click the submit button. 

      <br><br> 
            
      <asp:TextBox ID="Comment"
           TextMode="MultiLine"
           Columns="50"
           Rows="5"
           runat="server"/>

      <br>

      <asp:RequiredFieldValidator
           ID="Value1RequiredValidator"
           ControlToValidate="Comment"
           ErrorMessage="Please enter a comment.<br>"
           Display="Dynamic"
           runat="server"/>                         

      <asp:CheckBox ID="WrapCheckBox"
           Text="Wrap Text"
           Checked="True"
           AutoPostBack="True"
           OnCheckedChanged="Check_Change"
           runat="server"/>

      &nbsp;&nbsp;

      <asp:CheckBox ID="ReadOnlyCheckBox"
           Text="ReadOnly"
           Checked="False"
           AutoPostBack="True"
           OnCheckedChanged="Check_Change"
           runat="server"/>

      &nbsp;&nbsp;

      <asp:Button ID="SubmitButton"
           Text="Submit"
           OnClick="SubmitButton_Click"
           runat="server"/>

      <hr>

      <asp:Label ID="Message"
           runat="server"/>

   </form>

</body>
</html>

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family

See Also

TextBox Class | TextBox Members | System.Web.UI.WebControls Namespace | MaxLength

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