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using System;
using System.Web.UI.WebControls;
namespace myControls
{
public class RequiredTextBox : CompositeControl
{
private TextBox input;
private RequiredFieldValidator validator;
public string Text
{
get
{
EnsureChildControls();
return input.Text;
}
set
{
EnsureChildControls();
input.Text = value;
}
}
protected override void CreateChildControls()
{
input = new TextBox();
input.ID = "input";
this.Controls.Add(input);
validator = new RequiredFieldValidator();
validator.ID = "valInput";
validator.ControlToValidate = input.ID;
validator.ErrorMessage = "(Required)";
validator.Display = ValidatorDisplay.Dynamic;
this.Controls.Add(validator);
}
}
}
File: Default.aspx
<%@ Page Language="C#" Trace="true" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnSubmit_Click(object sender, EventArgs e)
{
lblResults.Text = txtUserName.Text;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show RequiredTextBox</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
ID="lblUserName"
Text="User Name:"
AssociatedControlID="txtUserName"
Runat="server" />
<custom:RequiredTextBox
ID="txtUserName"
Runat="Server" />
<br />
<asp:Button
ID="btnSubmit"
Text="Submit"
Runat="server" OnClick="btnSubmit_Click" />
<hr />
<asp:Label
id="lblResults"
Runat="server" />
</div>
</form>
</body>
</html>
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