If none of the existing ASP.NET server controls meet your requirements, then you can create a custom control by deriving from one of the base control classes. This Web Forms ASP.NET tutorial will show you how to achieve this.
Adding Custom Control to the Toolbox
1. Create a test Web Forms page. (WebForm1)
2. Using Tools menu, click Add/Remove Toolbox Items.
3. …
This is a very common scenario when you would like to disable button after click, so the user could not click it again if you need some time to do some task which takes longer time to be executed.
Disable a button after click in ASP.NET before the PostBack
If you would like to disable button to do some task, …
You can make the TextBox control readonly by setting its ReadOnly property to true. You can set this property in the .aspx page which contains the TextBox control, or programmatically from the code-behind. The next test .aspx page shows this:
ReadOnlyTextBox.aspx
<%@ Page Language=”C#” AutoEventWireup=”true” CodeBehind=”ReadOnlyTextBox.aspx.cs”
Inherits=”TextBoxSamplesVC.ReadOnlyTextBox” %>
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”https://www.w3.org/1999/xhtml”>
<head runat=”server”>
You can render the TextBox control to as password type by setting its TextMode property to Password.
TextBoxAsPassword.aspx
<%@ Page Language=”vb” AutoEventWireup=”false” CodeBehind=”TextBoxAsPassword.aspx.vb”
Inherits=”TextBoxSamplesVB.TextBoxAsPassword” %>
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”https://www.w3.org/1999/xhtml”>
<head runat=”server”>
<title>Password type TextBox</title>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
<asp:TextBox ID=”tbPassword” runat=”server” TextMode=”Password”></asp:TextBox>
</div>
</form>
</body>
</html>
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How to programmatically set the TextBox value and get the TextBox value in ASP.NET in VB.NET
The next example uses a test.aspx page named SetAndGetTextBox.aspx which has two asp:Label controls and one asp:TextBox control. In the code behind the local string variable value is use to read in it the system date and time by using:
Value = DateTime.Now.ToString
The rows in bold show how value is used to set the TextBox and how …
How to programmatically set the TextBox value and get the TextBox value in ASP.NET in C#
The next example uses a test.aspx page named SetAndGetTextBox.aspx which has two asp:Label controls and one asp:TextBox control. In the code behind the local string variable value is use to read in it the system date and time by using:
value = DateTime.Now.ToString();
The rows in bold show how value is used to set the TextBox and how …
When you want to write encoded text on the web page you should use the Literal control, because it does support a property that is not supported by the Label control: the Mode property. The property enables you to encode HTML content and accept any of the following three values:
– PassThrough—Displays the contents of …
How to associate a Label with a TextBox or other Form control in ASP.NET
The next code shows how you can attach an asp:Label control with the asp:TextBox. In this case when the user clicks the Label the application will focus on the TextBox.
TestAssociate.aspx
<%@ Page Language=”vb” AutoEventWireup=”false” CodeBehind=”TestAssociate.aspx.vb” Inherits=”TextChange.TestAssociate” %>
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”https://www.w3.org/1999/xhtml”>
<head runat=”server”>
<title>Associate a Label with a TextBox</title>
</head>
<body>
<form id=”form1″ runat=”server”>
How to apply CSS style in the Label control from code-behind in ASP.NET in VB.NET
You can apply CSS style from code behind by accessing the properties of the control with the help of its Id. Most of the CSS styles can be applied using the Font property and its sub properties of the Label control. However you can use ForeColor and BackColor directly from the Label control.
TestApplyCSS.aspx
<%@ Page …
How to change the text of the Label control from the code-behind in VB.NET
TestPage (.aspx)
<%@ Page Language=”vb” AutoEventWireup=”false” CodeBehind=”TestPage.aspx.vb” Inherits=”TestChange.TestPage” %>
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”https://www.w3.org/1999/xhtml”>
<head runat=”server”>
<title>Change the text of the Label control from the code-behind</title>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
<asp:Label ID=”LabelTest” runat=”server” Text=”My test label”></asp:Label>
</div>
</form>
</body>
</html>
Test page code-behind (.vb)
‘
‘TestPage.apsx.vb
‘
Public Class TestPage
Inherits System.Web.UI.Page
Protected Sub …