<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Load UserControl1" CommandName="UserControl1" OnCommand="btn1_Click" />
<asp:Button ID="Button2" runat="server" Text="Load UserControl2" CommandName="UserControl2" OnCommand="btn1_Click" />
<table>
<tr>
<td>
<asp:PlaceHolder ID="phModule" runat="server"></asp:PlaceHolder>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default5 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Session["UserControl"] = "UserControl1";
string ControlName = Convert.ToString(Session["UserControl"]);
LoadControls(ControlName);
}
else
{
if (Session["UserControl"] != null)
{
string ControlName = Convert.ToString(Session["UserControl"]);
LoadControls(ControlName);
}
}
}
private void LoadControls(string ControlName)
{
string CommandName = ControlName;
switch (CommandName)
{
case "UserControl1":
phModule.Controls.Clear();
Control myUserControl = (Control)Page.LoadControl("~/Controls/Uc1.ascx");
// Place web user control to place holder control
phModule.Controls.Add(myUserControl);
break;
case "UserControl2":
phModule.Controls.Clear();
myUserControl = (Control)Page.LoadControl("~/Controls/Uc2.ascx");
// Place web user control to place holder control
phModule.Controls.Add(myUserControl);
break;
}
}
protected void btn1_Click(object sender, CommandEventArgs e)
{
string CommandName = e.CommandName;
switch (CommandName)
{
case "UserControl1":
phModule.Controls.Clear();
Control myUserControl = (Control)Page.LoadControl("~/Controls/Uc1.ascx");
// Place web user control to place holder control
phModule.Controls.Add(myUserControl);
break;
case "UserControl2":
phModule.Controls.Clear();
myUserControl = (Control)Page.LoadControl("~/Controls/Uc2.ascx");
// Place web user control to place holder control
phModule.Controls.Add(myUserControl);
break;
}
Session["UserControl"] = CommandName;
}
protected void btn1_Click(object sender, EventArgs e)
{
}
}
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