how to load a button click event of a button in the usercontrol(.ascx page) from webform(.aspx page) using preinit event of asp.net

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usercontrol.ascx.cs
--------------------------

C#

namespace UserControlDemo
{
    public partial class WebUserControl1 : System.Web.UI.UserControl
    {
        private string LabelText = string.Empty;
        protected void Page_Load(object sender, EventArgs e)
        {
           }
        public string AllNames
        {
            get
            {
                string RetVal = string.Empty;
                if (this.lblUserControl != null)
                {
                    RetVal = this.lblUserControl.Text;
                }
                
                return RetVal;
            }
            set
            {
                lblUserControl.Text = value;
            }
        }          
      
usercontrol.aspx
----------------------
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs"
    Inherits="UserControlDemo.WebUserControl1" %>
<asp:Table runat="server">
    <asp:TableRow runat="server">
        <asp:TableCell runat="server">
            <asp:Label ID="lblUserControl" runat="server" Text="Label" >
            <asp:Button ID="Button1" runat="server" Text="X" ForeColor="Maroon" 
                Height="20px" onclick="Button1_Click"/>
               <%-- <div id="ControlHolder"  runat="server">--%>
        
    

  

webform1.cs
----------------------
namespace UserControlDemo
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        WebUserControl1 wb = new WebUserControl1();
        protected void Page_PreInit(object sender, EventArgs e)
        {
           
            wb.button_Click +=new EventHandler(wb_button_Click);
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            
        }

       
        protected void chkList_SelectedIndexChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < chkList.Items.Count; i++)
            {
                if (chkList.Items[i].Selected)
                {
                    WebUserControl1 user1 = null;
                    //user1 = (WebUserControl1)LoadControl(user1.GetType(), null);

                    user1 = (WebUserControl1)LoadControl("WebUserControl1.ascx");
                    user1.AllNames = chkList.Items[i].Text;
                    div1.Controls.Add(user1);

                }
                
            }
        }
         
        protected void button_Click(object sender, EventArgs e)
        {
            wb.button_Click +=new EventHandler(wb_button_Click);
        }
        protected void wb_button_Click(object sender, EventArgs e)
        {
            div1.Controls.Remove(wb);
        }
             
    }
}

webform.aspx
--------------------
<html xmlns="http://www.w3.org/1999/xhtml">
<head  runat="server">
    <title></title>
</head>
<body>
    <form id="form1"  runat="server">
    <div id="div1"  runat="server">
    

    <div>
        <asp:CheckBoxList ID="chkList" runat="server"  
            onselectedindexchanged="chkList_SelectedIndexChanged" AutoPostBack="True">
            <asp:ListItem>Name1
            <asp:ListItem>Name2
            <asp:ListItem>Name3
            <asp:ListItem>Name4
        
    </div>
    <form>
</body>
</html>


Here user control with a label and button is being added but on click of close button all controls are getting closed but i want only that control to be closed...can anyone please help??/

Posted 30-May-13 18:16pm

Ramya Nagendra

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Mahesh Bailwal · Answer 1 · 2013-05-30T19:46:00

Solution 1

On every post back all the controls you have added dynamically get lost. You need to add them again on every post back if you want them rendered again. I think this is the case here.

Posted 30-May-13 19:46pm

Mahesh Bailwal

Comments

Ramya Nagendra 31-May-13 1:52am

Thanks Mahesh Bailwal, but i want to access the properties of the usercontrol that cause the postback. How can I do that??

Mahesh Bailwal 31-May-13 3:13am

Take a look at solution 2

Mahesh Bailwal · Answer 2 · 2013-05-30T20:27:00

Below I have created sample code for you. In this example I have loaded user control in every post back, same thing you have to do.

User Control Code

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="WebApplication3.WebUserControl1" %>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1"
    runat="server" Text="Button" onclick="Button1_Click" />

public partial class WebUserControl1 : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.Write(TextBox1.Text);
        }
    }

Web Page code

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Ajax.aspx.cs" Inherits="WebApplication3.Ajax" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div id="divControlHolder" runat="server">
        </div>
    </div>
    </form>

    <script>
 
    </script>

</body>
</html>

public partial class Ajax : System.Web.UI.Page
 {
     public string message;
     protected void Page_Load(object sender, EventArgs e)
     {
             LoadControl();
     }

     private void LoadControl()
     {

         WebUserControl1 user1 = null;
         //user1 = (WebUserControl1)LoadControl(user1.GetType(), null);

         for (int i = 0; i < 10; i++)
         {
             user1 = (WebUserControl1)LoadControl("WebUserControl1.ascx");

             divControlHolder.Controls.Add(user1);

         }
     }
 }