Note : Event occurs only when the AutoPostBack property of the control is set to true.
Example of TextChanged event of the TextBox when AutoPostBack property is set to true.
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void TextBox2_TextChanged(object sender, EventArgs e)
{
int a = Convert.ToInt32(TextBox1.Text);
int b = Convert.ToInt32(TextBox2.Text);
int c = a + b;
TextBox3.Text = Convert.ToString(c);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Enter first number:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
Enter Second Number :
<asp:TextBox ID="TextBox2" runat="server" OnTextChanged="TextBox2_TextChanged" AutoPostBack="True"></asp:TextBox>
<br />
Total : <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
<!DOCTYPE html>
<script runat="server">
protected void TextBox2_TextChanged(object sender, EventArgs e)
{
int a = Convert.ToInt32(TextBox1.Text);
int b = Convert.ToInt32(TextBox2.Text);
int c = a + b;
TextBox3.Text = Convert.ToString(c);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Enter first number:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
Enter Second Number :
<asp:TextBox ID="TextBox2" runat="server" OnTextChanged="TextBox2_TextChanged" AutoPostBack="True"></asp:TextBox>
<br />
Total : <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
first enter any number into first Textbox after press TAB key
and enter second number again press TAB key , Your result will show after pressing tab key.
