Referred URL - http://www.aspdotnet-suresh.com/2010/09/how-to-create-controls-dynamically-in.html
Introduction:
Introduction:
Here I will explain how to generate the controls dynamically in code behind using asp.net
Description:
Hi here I will explain how to generate the controls dynamically in asp.net code behind
First design the your aspx page with one panel like this
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form2" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server">
</asp:Panel>
</div>
</form>
</body>
</html>
|
After that write the following code in page load method like this
protected void Page_Load(object sender, EventArgs e)
{
Table tbldynamic = new Table();
for (int i = 0; i < 5; i++)
{
TableCell tc = new TableCell();
TableRow tr = new TableRow();
CheckBox _checkbox = new CheckBox();
_checkbox.ID = "chkDynamicCheckBox" + i;
_checkbox.Text = "Checkbox" + i;
tc.Controls.Add(_checkbox);
tr.Cells.Add(tc);
tbldynamic.Rows.Add(tr);
}
Panel1.Controls.Add(tbldynamic);
}
|
Now run application you will see dynamically generated checkboxes like that we can generate controls dynamically.
To implement this concept first design table in database and give name as UserDetails as shown below
Column Name
|
Data Type
|
Allow Nulls
|
UserId
|
int(set identity property=true)
|
No
|
UserName
|
varchar(50)
|
Yes
|
Email
|
varchar(100)
|
Yes
|
After completion table design write the following code in your aspx page
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Create controls dynamically in asp.net and handle button click events</title>
</head>
<body>
<form id="form2" runat="server">
<div>
<asp:Panel ID="pnlInfo" runat="server">
</asp:Panel>
</div>
</form>
</body>
</html>
|
After completion of aspx page design add the following namespaces in code behind
C# code
using System;
using System.Data.SqlClient;
using System.Web.UI.WebControls;
|
After add namespaces write the following code in code behind like as shown below
protected void Page_Load(object sender, EventArgs e)
{
Table tbldynamic = new Table();
TableCell tc=new TableCell();
TableCell tc1=new TableCell();
TableRow tr = new TableRow();
Label lblName =new Label();
lblName.ID = "lblName";
lblName.Text = "UserName:";
tc.Controls.Add(lblName);
TextBox txtName=new TextBox();
txtName.ID = "txtName";
tc1.Controls.Add(txtName);
tr.Cells.Add(tc);
tr.Cells.Add(tc1);
tbldynamic.Rows.Add(tr);
tc=new TableCell();
tc1=new TableCell();
tr=new TableRow();
Label lblEmail = new Label();
lblEmail.ID = "lblEmail";
lblEmail.Text = "Email:";
tc.Controls.Add(lblEmail);
TextBox txtEmail = new TextBox();
txtEmail.ID = "txtEmail";
tc1.Controls.Add(txtEmail);
tr.Cells.Add(tc);
tr.Cells.Add(tc1);
tbldynamic.Rows.Add(tr);
tc = new TableCell();
tc1 = new TableCell();
tr = new TableRow();
Button btnSubmit = new Button();
btnSubmit.ID = "btnSubmit";
btnSubmit.Text = "Submit";
btnSubmit.Click += new System.EventHandler(btnSubmit_click);
tc1.Controls.Add(btnSubmit);
tr.Cells.Add(tc);
tr.Cells.Add(tc1);
tbldynamic.Rows.Add(tr);
pnlInfo.Controls.Add(tbldynamic);
}
// Dynamic button click event which is used to save values in database
protected void btnSubmit_click(object sender, EventArgs e)
{
String str = string.Empty;
TextBox txtUserName = (TextBox)pnlInfo.FindControl("txtName");
// str = txtUserName.Text;
TextBox txtEmail = (TextBox)pnlInfo.FindControl("txtEmail");
using (SqlConnection con = new SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB"))
{
using (SqlCommand cmd =new SqlCommand("INSERT INTO UserDetails(UserName,Email) VALUES(@name,@mail)",con))
{
con.Open();
cmd.Parameters.AddWithValue("@name", txtUserName.Text);
cmd.Parameters.AddWithValue("@mail", txtEmail.Text);
cmd.ExecuteNonQuery();
txtEmail.Text = string.Empty;
txtUserName.Text = string.Empty;
ClientScript.RegisterClientScriptBlock(this.GetType(), "btn","<script type = 'text/javascript'>alert('UserDetails saved Successfully');</script>");
}
}
}
|
VB.NET Code
Imports System.Data.SqlClient
Imports System.Web.UI.WebControls
Partial Class Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
Dim tbldynamic As New Table()
Dim tc As New TableCell()
Dim tc1 As New TableCell()
Dim tr As New TableRow()
Dim lblName As New Label()
lblName.ID = "lblName"
lblName.Text = "UserName:"
tc.Controls.Add(lblName)
Dim txtName As New TextBox()
txtName.ID = "txtName"
tc1.Controls.Add(txtName)
tr.Cells.Add(tc)
tr.Cells.Add(tc1)
tbldynamic.Rows.Add(tr)
tc = New TableCell()
tc1 = New TableCell()
tr = New TableRow()
Dim lblEmail As New Label()
lblEmail.ID = "lblEmail"
lblEmail.Text = "Email:"
tc.Controls.Add(lblEmail)
Dim txtEmail As New TextBox()
txtEmail.ID = "txtEmail"
tc1.Controls.Add(txtEmail)
tr.Cells.Add(tc)
tr.Cells.Add(tc1)
tbldynamic.Rows.Add(tr)
tc = New TableCell()
tc1 = New TableCell()
tr = New TableRow()
Dim btnSubmit As New Button()
btnSubmit.ID = "btnSubmit"
btnSubmit.Text = "Submit"
AddHandler btnSubmit.Click, AddressOf btnSubmit_click
tc1.Controls.Add(btnSubmit)
tr.Cells.Add(tc)
tr.Cells.Add(tc1)
tbldynamic.Rows.Add(tr)
pnlInfo.Controls.Add(tbldynamic)
End Sub
' Dynamic button click event which is used to save values in database
Protected Sub btnSubmit_click(ByVal sender As Object, ByVal e As EventArgs)
Dim str As [String] = String.Empty
Dim txtUserName As TextBox = DirectCast(pnlInfo.FindControl("txtName"), TextBox)
' str = txtUserName.Text;
Dim txtEmail As TextBox = DirectCast(pnlInfo.FindControl("txtEmail"), TextBox)
Using con As New SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB")
Using cmd As New SqlCommand("INSERT INTO UserDetails(UserName,Email) VALUES(@name,@mail)", con)
con.Open()
cmd.Parameters.AddWithValue("@name", txtUserName.Text)
cmd.Parameters.AddWithValue("@mail", txtEmail.Text)
cmd.ExecuteNonQuery()
End Using
End Using
End Sub
End Class
|
Demo
 |
This diagram isn't meant to be exhaustive, but rather give a general sense of when things happen.
Modules can see any request if they are plugged into the pipeline. There are native modules written in C++ and managed modules written in .NET. Managed modules are run anytime a URL ends up being processed by ASP.NET or if "RAMMFAR" is turned on.
...remember that it's things like IHttpHandler that sit at the bottom and serve one request (everything comes from IHttpHandler) while it's IHttpModule that's always watching and can see every request.
In other words, and HttpHandler sees the ExecuteRequestHandler event which is just one event in the pipeline, while HttpModules can see every event they subscribe to.
