c# - Showing data into Label OnTextChanged event of TextBox

Question

let say I enter a code into textbox 100 but into label Pizza should be texted in label

protected void Page_Load(object sender, EventArgs e)
{

}

protected void txtMain_TextChanged(object sender, EventArgs e)
{        
   lblmain.text = txtcat.text;
}

Answer 1

The OnTextChanged is a server side event . It would be better to use JavaScript for this purpose like this:

<script type="text/javascript">
    function change() {
        document.getElementById('<%= lblmain.ClientID %>').innerHTML = document.getElementById('<%= txtMain.ClientID %>').value;
    }
</script> 

And then in your TextBox call to change function like this:

<asp:TextBox ID="txtMain" runat="server" onkeydown="change();"></asp:TextBox>
<asp:Label ID="lblmain" runat="server" Text="Label"></asp:Label>