TextBox.Columns Property
.NET Framework 4
Gets or sets the display width of the text box in characters.
Assembly: System.Web (in System.Web.dll)
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException |
The specified width is less than 0. |
The following code example demonstrates how to use the Columns property to specify a width of 2 characters for the TextBox control.
Security Note
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This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview. |
<%@ Page Language="C#" AutoEventWireup="True" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title> TextBox Example </title> <script runat="server"> protected void AddButton_Click(Object sender, EventArgs e) { int Answer; Answer = Convert.ToInt32(Value1.Text) + Convert.ToInt32(Value2.Text); AnswerMessage.Text = Answer.ToString(); } </script> </head> <body> <form id="form1" runat="server"> <h3> TextBox Example </h3> <table> <tr> <td colspan="5"> Enter integer values into the text boxes. <br /> Click the Add button to add the two values. <br /> Click the Reset button to reset the text boxes. </td> </tr> <tr> <td colspan="5"> </td> </tr> <tr align="center"> <td> <asp:TextBox ID="Value1" Columns="2" MaxLength="3" Text="1" runat="server"/> </td> <td> + </td> <td> <asp:TextBox ID="Value2" Columns="2" MaxLength="3" Text="1" runat="server"/> </td> <td> = </td> <td> <asp:Label ID="AnswerMessage" runat="server"/> </td> </tr> <tr> <td colspan="2"> <asp:RequiredFieldValidator ID="Value1RequiredValidator" ControlToValidate="Value1" ErrorMessage="Please enter a value.<br />" Display="Dynamic" runat="server"/> <asp:RangeValidator ID="Value1RangeValidator" ControlToValidate="Value1" Type="Integer" MinimumValue="1" MaximumValue="100" ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />" Display="Dynamic" runat="server"/> </td> <td colspan="2"> <asp:RequiredFieldValidator ID="Value2RequiredValidator" ControlToValidate="Value2" ErrorMessage="Please enter a value.<br />" Display="Dynamic" runat="server"/> <asp:RangeValidator ID="Value2RangeValidator" ControlToValidate="Value2" Type="Integer" MinimumValue="1" MaximumValue="100" ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />" Display="Dynamic" runat="server"/> </td> <td>   </td> </tr> <tr align="center"> <td colspan="4"> <asp:Button ID="AddButton" Text="Add" OnClick="AddButton_Click" runat="server"/> </td> <td> </td> </tr> </table> </form> </body> </html>
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
