VS2005: Events from User Control Stored in Session Do Not Fire

H

HammRadio

I am exploring converting my web app (current Framework 1.1) to
Framework 2.0. Everything went smoothly save for one item. To reduce
the trips to the database, when loading user controls (like a large
datagrid or form), we store the grid or form in Session Object. On
PostBack we grab the control from the session, add it to our main
form. In VS 2003 (1.1), the page will fire any event called in the
custom control, e.g, cmdSave_Click. In VS 2005 (2.0), the control is
loaded, but no event occurs.

In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click fires


In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click does
not fire.

Any thoughts on why one would work in 2003 and one wouldn't work in
2005.

I thought it might be just my code. So I created a whole new
application that simplifies everything, here is the user control:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Sandbox
{
public partial class ucUserControlTest : System.Web.UI.UserControl
{



protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
this.TextBox1.Text = "Page is Loaded!";
}
}

private void InitializeComponent()
{
this.cmdSave.Click += new
EventHandler(this.cmdSave_Click);

}

public void cmdSave_Click(object sender, EventArgs e)
{

this.TextBox1.Text = "I Clicked Save.";

}


}
}


Here is the form:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Sandbox
{
public partial class UserControlTestForm : System.Web.UI.Page
{

protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}

private void InitializeComponent()
{
if (!IsPostBack)
{
LoadUserControls();
}
else
{
LoadSessionControl();

}


}

protected void Page_Load(object sender, EventArgs e)
{
/// Nothing Happens Here

}


private void LoadUserControls()
{

UserControl temp = (UserControl)
LoadControl("ucUserControlTest.ascx");
this.pForm.Controls.Add(temp);
Session.Add("CurrentFormControl", temp);
}

private void LoadSessionControl()
{

UserControl temp = (UserControl)
Session["CurrentFormControl"];
/// Clears any Controls on Page. Behavior is the same
whether this is here or not.
this.pForm.Controls.Clear();
this.pForm.Controls.Add(temp);

}

}
}
 
B

bruce barker

your approach is not valid. asp.net does not support this model. as the
controls can be disposed at form unload, they may be resurrected. most
are not writtn to support this. also if they keep any state of their
initialization, you are defeating it.

you should save the dataset in session not the controls.

-- bruce (sqlwork.com)

I am exploring converting my web app (current Framework 1.1) to
Framework 2.0. Everything went smoothly save for one item. To reduce
the trips to the database, when loading user controls (like a large
datagrid or form), we store the grid or form in Session Object. On
PostBack we grab the control from the session, add it to our main
form. In VS 2003 (1.1), the page will fire any event called in the
custom control, e.g, cmdSave_Click. In VS 2005 (2.0), the control is
loaded, but no event occurs.

In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click fires


In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click does
not fire.

Any thoughts on why one would work in 2003 and one wouldn't work in
2005.

I thought it might be just my code. So I created a whole new
application that simplifies everything, here is the user control:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Sandbox
{
public partial class ucUserControlTest : System.Web.UI.UserControl
{



protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
this.TextBox1.Text = "Page is Loaded!";
}
}

private void InitializeComponent()
{
this.cmdSave.Click += new
EventHandler(this.cmdSave_Click);

}

public void cmdSave_Click(object sender, EventArgs e)
{

this.TextBox1.Text = "I Clicked Save.";

}


}
}


Here is the form:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace Sandbox
{
public partial class UserControlTestForm : System.Web.UI.Page
{

protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}

private void InitializeComponent()
{
if (!IsPostBack)
{
LoadUserControls();
}
else
{
LoadSessionControl();

}


}

protected void Page_Load(object sender, EventArgs e)
{
/// Nothing Happens Here

}


private void LoadUserControls()
{

UserControl temp = (UserControl)
LoadControl("ucUserControlTest.ascx");
this.pForm.Controls.Add(temp);
Session.Add("CurrentFormControl", temp);
}

private void LoadSessionControl()
{

UserControl temp = (UserControl)
Session["CurrentFormControl"];
/// Clears any Controls on Page. Behavior is the same
whether this is here or not.
this.pForm.Controls.Clear();
this.pForm.Controls.Add(temp);

}

}
}
Click to expand...
 
H

HammRadio

Thanks bruce.

Any idea why Framework 1.1 kept the state and all events remained
valid? Was that jsut a "bug" in 1.1?

your approach is not valid. asp.net does not support this model. as the
controls can be disposed at form unload, they may be resurrected. most
are not writtn to support this. also if they keep any state of their
initialization, you are defeating it.

you should save the dataset in session not the controls.

-- bruce (sqlwork.com)


I am exploring converting my web app (current Framework 1.1) to
Framework 2.0. Everything went smoothly save for one item. To reduce
the trips to the database, when loading user controls (like a large
datagrid or form), we store the grid or form in Session Object. On
PostBack we grab the control from the session, add it to our main
form. In VS 2003 (1.1), the page will fire any event called in the
custom control, e.g, cmdSave_Click. In VS 2005 (2.0), the control is
loaded, but no event occurs.
Click to expand...
In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click fires
Click to expand...
In VS 2003
Page Init -> Load UserControl -> cmdSave -> Click -> PostBack -> Page
Init -> Load Control From Session -> Page Load -> cmdSave_Click does
not fire.
Click to expand...
Any thoughts on why one would work in 2003 and one wouldn't work in
2005.
Click to expand...
I thought it might be just my code. So I created a whole new
application that simplifies everything, here is the user control:
Click to expand...
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
Click to expand...
namespace Sandbox
{
public partial class ucUserControlTest : System.Web.UI.UserControl
{
Click to expand...
protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}
Click to expand...
protected void Page_Load(object sender, EventArgs e)
{
Click to expand...
if (!IsPostBack)
{
this.TextBox1.Text = "Page is Loaded!";
}
}
Click to expand...
private void InitializeComponent()
{
this.cmdSave.Click += new
EventHandler(this.cmdSave_Click);

public void cmdSave_Click(object sender, EventArgs e)
{
Click to expand...
this.TextBox1.Text = "I Clicked Save.";


Here is the form:
Click to expand...
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
Click to expand...
namespace Sandbox
{
public partial class UserControlTestForm : System.Web.UI.Page
{
Click to expand...
protected override void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form
Designer.
//
InitializeComponent();
}
Click to expand...
private void InitializeComponent()
{
if (!IsPostBack)
{
LoadUserControls();
}
else
{
LoadSessionControl();


protected void Page_Load(object sender, EventArgs e)
{
/// Nothing Happens Here

private void LoadUserControls()
{
Click to expand...
UserControl temp = (UserControl)
LoadControl("ucUserControlTest.ascx");
this.pForm.Controls.Add(temp);
Session.Add("CurrentFormControl", temp);
}
Click to expand...
private void LoadSessionControl()
{
Click to expand...
UserControl temp = (UserControl)
Session["CurrentFormControl"];
/// Clears any Controls on Page. Behavior is the same
whether this is here or not.
this.pForm.Controls.Clear();
this.pForm.Controls.Add(temp);
}
Click to expand...

}
}- Hide quoted text -
Click to expand...

- Show quoted text -
Click to expand...
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

Viewstate Dynamically added control (ASP.NET 2.0) 1
Error in Session 4
saving a value in page_init for use later in postback 2
Events in DataList EditItem Template won't fire 3
session 1
How to Persist an added Control in the form. 5
User Control in Repeater fires multiple events. 1
Override Text and Visible in System.Web.UI.UserControl 1

Top