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HtmlTextArea.Cols Property

Gets or sets the width (in characters) of the HtmlTextArea control.

Namespace:  System.Web.UI.HtmlControls
Assembly:  System.Web (in System.Web.dll)

public int Cols { get; set; }
<asp:HtmlTextArea Cols="Int32" />

Property Value

Type: System.Int32
The width (in characters) of the HtmlTextArea control. The default value is -1, which indicates that this property is not set.

Use the Cols property to specify or determine the width (in characters) of the HtmlTextArea control. If you enter text that is longer than the width of the text box, the text automatically continues on the next line of the control.

To control the height of the control, set the Rows property.

The following code example demonstrates how to use the Cols property to control the width of the HtmlTextArea control.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<script runat="server">

  void SubmitBtn_Click(Object sender, EventArgs e)
    TextArea1.Cols = Convert.ToInt32(Select1.Value);
    Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value;


<html xmlns="http://www.w3.org/1999/xhtml" >
   <title>HtmlTextArea Example</title>


   <form id="form1" runat="server">

      <h3>HtmlTextArea Example</h3>

      Enter your comments: <br />

      <textarea rows="2" cols="20" id="TextArea1" 

      <br />
      Select column width: <br />

      <select id="Select1"

         <option value="10" selected="selected"> 10 </option>
         <option value="20"> 20 </option>
         <option value="30"> 30 </option>
         <option value="40"> 40 </option>
         <option value="50"> 50 </option>
         <option value="60"> 60 </option>


      <br /><br />

      <input type="submit"  

      <br />

      <span id="Span1" 
            runat="server" />



.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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