Normally when you create a control dynamically means at runtime, on the next page load you will loose that control, that control will be no longer exists, in this example I am try to explain how we can store that controls and get them back.
Create a Web Application and Add one button to it.
In the page load add following code, in the following code I am creating a object of Control Collection and keeping it in the Session.
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
ControlCollection ctrls = new ControlCollection(Page.Form);
Session["Controls"] = ctrls;
}
}
Now Doble click on button1 and add following code in Button1_Click event.
Here in this code I am storing all the controls created into control collection and saving into session.
protected void Button2_Click(object sender, EventArgs e)
{
//Creating object of Control Collection
ControlCollection ctrls = null;
//Checking if Object is already present in session or not
// If not present create again.
if (Session["Controls"] != null)
{
ctrls = (ControlCollection)Session["Controls"];
}
else
{
ctrls = new ControlCollection(Page.Form);
}
//Using random number to avoid conflict in control names
Random r = new Random();
//Creating label control
Label l1 = new Label();
l1.ID = "Label" + r.NextDouble().ToString();
l1.Text = "Some Text";
//Adding label control to control collection
ctrls.Add(l1);
//Creating text control
TextBox txt = new TextBox();
txt.ID = "TextBox" + r.NextDouble().ToString();
//Adding text control to control collection
ctrls.Add(txt);
//Now add controls whic are present in
//Control collection to form
foreach (Control ctrl in ctrls)
{
Page.Form.Controls.Add(ctrl);
}
//Save the control back to session.
Session["Controls"] = ctrls;
}
now we are ready with code jusr build, run and test
Hope this helps.
SatishKumar J
Microsoft MVP(ASP.NET)
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