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HtmlSelect.Size Property

Gets or sets the height (in rows) of the HtmlSelect control.

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

public int Size { get; set; }
<asp:HtmlSelect Size="Int32" />

Property Value

Type: System.Int32
The height (in rows) of the HtmlSelect control.

Use the Size property to specify the height (in rows) of the HtmlSelect control. If you specify a size that is smaller than the number of items in the control, scroll bars are displayed to allow you to move up and down the list.

By default, the HtmlSelect control is displayed as a drop-down list box. If you allow multiple selections (by setting the Multiple property to true) or specify a height greater than one row (by setting the Size property to a value greater than 1), the control is displayed as a list box.

The following code example demonstrates how to use the Size property to specify the height (in rows) of the HtmlSelect control.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

      void Button_Click (Object sender, EventArgs e)
      {

         Label1.Text = "You selected:";

         for (int i=0; i<=Select1.Items.Count - 1; i++)
         {

            if (Select1.Items[i].Selected)
               Label1.Text += "<br /> &nbsp;&nbsp; -" + Select1.Items[i].Text;      

         }

         Select1.Size = Convert.ToInt32(Select2.Value);

      }

      void Check_Changed (Object sender, EventArgs e)
      {

         Select1.Multiple = CheckBox1.Checked;

      }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title> HtmlSelect Example </title>
</head>
<body>
<form id="form1" runat="server">
   <div>

      <h3> HtmlSelect Example </h3>

      Select item(s) from the list: <br /><br />

      <select id="Select1" 
              multiple="true"
              runat="server">

         <option value="1" selected="selected"> Item 1 </option>
         <option value="2"> Item 2 </option>
         <option value="3"> Item 3 </option>
         <option value="4"> Item 4 </option>
         <option value="5"> Item 5 </option>
         <option value="6"> Item 6 </option>

      </select>

      <hr />

      HtmlSelect Size: <br />

      <select id="Select2" 
              runat="server">

         <option value="1"> 1 </option>
         <option value="2"> 2 </option>
         <option value="3"> 3 </option>
         <option value="4" selected="selected"> 4 </option>
         <option value="5"> 5 </option>
         <option value="6"> 6 </option>

      </select>

      &nbsp;&nbsp;

      <asp:CheckBox id="CheckBox1"
           Text="Enable Multiple Property"
           AutoPostBack="True"
           OnCheckedChanged="Check_Changed"
           Checked="True"
           runat="server"/>

      <br /><br />

      <button id="Button1"
              onserverclick="Button_Click"
              runat="server">

         Submit

      </button>

      <br /><br />

      <asp:Label id="Label1" runat="server"/>

   </div>
</form>
</body>
</html>

.NET Framework

Supported in: 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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