Skip to main content

TextBox OnTextChanged event in asp.net c#

TextBox OnTextChanged event
TextBox control is a input control in .net framework that lets the user input text. this example demonstare us how asp.net textbox TextChanged event (OnTextChanged event) works. text box TextChanged event occurs (triggers) when text changed in textbox control. TextChanged event is asynchronius, so the event cannot be canceled. simply we can say TextChanged event occurs when the TextBox Text property value changes.

in this example web form we create two textbox controls. first textbox control's AutoPostBack property value set to true. and we assign an OnTextChanged property value. so using this property we create a TextChanged event. when you make change textbox text, it trigger TextChanged event and another textbox control display first textbox current content.
TextBoxOnTextChanged.aspx

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

<!DOCTYPE html>

<script runat="server">
    protected void TextBox1_TextChanged(object sender, System.EventArgs e)
    {
        TextBox2.Text = TextBox1.Text;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to use OnTextChanged event in TextBox</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">TextBox Example: OnTextChanged</h2>
        <asp:Label 
             ID="Label1" 
             runat="server"
             Text="Email"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server"
             AutoPostBack="true"
             OnTextChanged="TextBox1_TextChanged"
             >
        </asp:TextBox>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server"
             Text="Confirm Email"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox2" 
             runat="server"
             BackColor="LightGoldenrodYellow"
             ForeColor="Crimson"
             >
        </asp:TextBox>
    </div>
    </form>
</body>
</html>
More asp.net examples

Popular posts from this blog

How to use Table in asp.net

Table Web Server Control ASP.NET Table web server control display a table on a web page. It is a .NET web server control so we can program it in server code such as add, remove table row, cell programmatically. TableRow and TableCell web server controls allow us to display content for the Table. Table server control display tabular data and we can format Table server control using it's built in methods and properties. The big difference between HTML table and asp.net Table server control is that we can manipulate Table server control using an object model. Generally we should use Table server control when we intend to add remove rows and cells (columns) programmatically at run time.

Table server control acts as a parent (container) for TableRows controls. Table control's Rows property is a collection of TableRow objects. each TableRow control has a collection named Cells. Cells collection contains TableCell objects.

Actually table server control display the TableCell con…

How to use RadioButton control in asp.net c#

RadioButton web server control RadioButton control lets you make a group of radio buttons with other RadioButton. If you set it's GroupName property same for multiple radio buttons then all radio buttons with same name act as a single group. Within a group you can only select one RadioButton at a time. RadioButton group work as like RadioButtonList. With RadioButton control you can more customize it than RadioButtonList items.

Back color, border color, border style, font names, font bold, font italic, fore color (text color) and many more property help you to design RadioButton. It also support CSS class, theme and skin. Even validation are works with RadioButton control. RadioButton have AutoPostBack property and CheckChanged event. By using those feature you can determine immediately which RadioButton is selected from a group.

This example uses a RadioButton group with two RadioButton. Here we assign AutoPostBack property value to true and setup a CheckChanged event. When …

How to use RadioButtonList control in asp.net c#

RadioButtonList web server control ASP.NET RadioButtonList control enable user to select an item from list. RadioButtonList support data bind programmatically from database. We can also populate it manually by input list item inside RadioButtonList tag. RadioButtonList is a single selection radio button group. RadioButtonList have an items collection. We can determine which item is selected by test it's SelectedItem property.

We can change RadioButtonList design by setting up it's various property as like BackColor, BorderColor, BorderStyle, BorderWidth, CellPadding, CellSpacing, CssClass, Font-Bold, Font-Italic, Font-Names, Font-Overline, Font-Size etc. there are more three properties RepeatColumns, RepeatDirection and RepeatLayout which help you to place list item vertically or horizontally.

RadioButtonList have standard AutoPostBack property. As like other list control RadioButtonList have an excellent event SelectedIndexChanged. So that when someone select an item it…