ASP.NET

System.Web.UI.Control

<%@ Page %>

<%@ Register TagPrefix="Custom" Namespace="CustomControlNamespace" Assembly="CustomControlAssembly" %>

<Custom:CustomControl runat="server"></Custom:CustomControl>

<Custom:CustomControl runat="server" ID="CustomControl1"></Custom:CustomControl>

System.Web.UI.UserControl

System.Web.UI.Control

<pre><%@ Control Language="C#" AutoEventWireup="true" CodeBehind="CustomControl.ascx.cs" Inherits="CustomControlNamespace.CustomControl" %>
<table>
    <tr>
        <td>First Name:</td>
        <td><asp:TextBox runat="server" ID="txtFirstName"></asp:TextBox></td>
    </tr>
    <tr>
        <td>Last Name:</td>
        <td><asp:TextBox runat="server" ID="txtLastName"></asp:TextBox></td>
    </tr>
    <tr>
        <td colspan="2" style="text-align: center"><asp:Button runat="server" ID="btnShowName" Text="Show Name" OnClick="btnShowName_Click"/></td>
    </tr>
</table>
<br/>
<br/>
<asp:Label runat="server" ID="lblFullName"></asp:Label>

using System;

namespace CustomControlNamespace
{
    public partial class CustomControl : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnShowName_Click(object sender, EventArgs e)
        {
            string firstName = txtFirstName.Text.Trim();
            string lastName = txtLastName.Text.Trim();
            string fullName = $"Hello {firstName} {lastName}!  If you are seeing this message, then the custom control " +
                              $"is working successfully.";
            lblFullName.Text = fullName;
        }
    }
}

<input type="submit" name="ctl00$grdConfig$ctl04$btnAdd" value="Add New" id="btnAdd" wtx-context="FC3AB902-A74E-4209-8E0D-9F9AC5F15021">

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       If Page.IsPostBack Then
           ClientScript.RegisterHiddenField("isPostBack", "1")
       End If
   End Sub

var isPostBackObject = document.getElementById('isPostBack');
            if (isPostBackObject != null) {
             //Do something
            }

Dim AdminFinalFilename As New List(Of String)

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click


        finalfilename = DateTime.Now.ToString("ddMMyyhhmm") + "_" + FileUpload1.FileName
       
            AdminFormFilename.Add(finalfilename)


End Sub

 Protected Sub FormSubmit_Click(sender As Object, e As EventArgs) Handles FormSubmit.Click


If AdminFinalFilename Is Nothing Then

        Else

            Dim i As Integer
            For i = 0 To AdminFinalFilename.Count - 1

                Dim y As New accessadminreq

                y.InsertAdminUpload(FormID, (AdminFinalFilename.Item(i)))

            Next i

        End If


End Sub