Custom Control to Custom Control communication using event delegate mech.

I have a custom control “AddressPicker” that displays dynamic address information of a user. BY dynamic I mean based on the database call it checks how may addresses a user has and it displays it. There is a “Use this Address” button at the bottom of each address information which is generated dynamically too as a part of CreateChildControl. If a user click on this button I need to pass this information to another custom control namely “AddressConsumer” which in turn uses this information for further processing.My Controls are inherited WebCOntrol,INamingContainer

I am using the event delegate mechanism to pass information from one control to other

This is a code snippet from AddressPicker control

public delegate void AddressClickEventHandler(object sender, AddressClickEventArgs e); public event AddressClickEventHandler AddressClick;protected virtual void OnAddressClick(AddressClickEventArgs args)        {            if (AddressClick != null)            {                // Invoke the delegate.                AddressClick(this, args);            }       


AddressClickEventHandler is a class inherited from EventArgs which I am using for getting/setting address fields

This is the “Use This Address”  button Click

protected void btnUseThisAddress_Click(object sender, EventArgs e)


AddressClickEventArgs args = new AddressClickEventArgs();                    

args.FirstName = lblFirstName.Text;            args.MiddleInitial = lblMiddleInitial.Text;            args.LastName = lblLastName.Text;            args.Suffix = lblSuffix.Text;            args.Address1 = lblAddress1;             



This is a code snippet from AddressConsumer control.  

public void AddressClick(object sender, AddressClickEventArgs args)

{txtFirstName.Text = args.FirstName;            txtMiddleInitial.Text = args.MiddleInitial;            txtLastName.Text = args.LastName;            txtSuffix.Text = args.Suffix;           

txtAddress1.Text = args.Address1;


I am testing this Controls by dropping them on a Web Page and implementing

protected void Page_Load(object sender, EventArgs e)        {            AddressPicker.AddressClick += new AddressPicker.AddressClickEventHandle(AddressPicker1_AddressClick);        }         protected void AddressPicker1_AddressClick(object sender, AddressClickEventArgs e)        {            AddressConsumer.AddressClick(sender, e);        }       

Here is how I am creating Child Controls & Rendering it

protected override void CreateChildControls()        {            Controls.Clear();            addressList = GetAddressList()     


{Gets the individual value of address filedsCreateChildControlName(pass extracted Name value from List);CreateChildControlAddress(pass extracted Address value from List);& so on} While rendering I am doing the same stuff and then rendering it. 


After reading lot of forums I  guess the part of the problem is I may have to use RaiseBububble and OnBUbble  PLUS I need to add all the child controls in a container in a ControlCollection  so that it can uniquely identify the child control while generating it dynamically but I am not sure how to incorporate in this scenario. Any help would be greatly appreciated.


"Adding a TextBox and a BUtton as One Control  and then repeatedly  adding this Control  to a Container in a Control collection and then later on using a ONBubble and RaiseBubble to find out exactly which Button is clicked and extracting clicked button corresponding TextBox value."




3/14/2009 7:06:18 PM 3498 articles. 0 followers. Follow

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"Adding a TextBox and a BUtton as One Control  and then repeatedly  adding this Control  to a Container in a Control collection and then later on using a ONBubble and RaiseBubble to find out exactly which Button is clicked and extracting clicked button corresponding TextBox value."

If this is what you need you can try the following code:




public class MyControl : WebControl {

TextBox tb = new TextBox();

Button btn = new Button();protected override void OnInit(EventArgs e)



btn.Click += new EventHandler(btn_Click);

btn.Text = "Click Me";



void btn_Click(object sender, EventArgs e)








<asp:Panel ID="Panel1" runat="server">

<cc2:MyControl ID="MyControl1" runat="server" />

<cc2:MyControl ID="MyControl2" runat="server" />

<cc2:MyControl ID="MyControl3" runat="server" />


Allen Chen
Microsoft Online Community Support

Please remember to mark the replies as answers if they help and unmark them if they provide no help.
3/16/2009 1:58:43 AM

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