Create controls dynamically on button click

Hi,

 

I need to create dynamic controls on button click.

 

HTML:

 

 

CODE:

 

When clicked on AddSorting shown in the below image I am trying to create dropdown control using below code and the controls doesn't show.

 

 

protected void lnkAddSort_Click(object sender, EventArgs e)

{

int index = pnlSort.Controls.OfType().ToList().Count + 1;

this.Createddl("ddldyn" + index);

}

public void Createddl(string id)

{

DropDownList ddl = new DropDownList();

ddl.ID = id;

pnlSort.Controls.Add(ddl);

Literal lt = new Literal();

lt.Text = "
";

pnlSort.Controls.Add(lt);

}

 

Can anyone please provide suggestions on how to handle this?