Why composite control click event not firing?

[Mohammad Reza Sheikh]

hi dears.

i wrote a composite asp.net control named as (WebDbConnection) to manage connection string of my database. i added a button "btnConnect" and created click event for it in "CreateChildControls" method.

public WebDbConnection(string extraParameters, string configConnectionName, string databaseName,
bool showDbName, string dialogName, bool isEncrypted,ref Page page)
{
_currentPage = page;
_extraParameters = extraParameters;
_dialogName = dialogName;
IsEncrypted = isEncrypted;
_showDbName = showDbName;

_configConnectionName = configConnectionName;
LoadDefaultConnectionString(IsEncrypted);

_databaseName = databaseName;


}
protected void BtnConnect_Click(object sender, EventArgs e)
{
try
{
EnsureChildControls();
_server = Dbconnection_txtServer.Text;
_userName = Dbconnection_txtUser.Text;
_password = Dbconnection_txtPass.Text;
_databaseName = Dbconnection_txtdbname.Text;

if (Connection.State == ConnectionState.Connecting)
return;

Connect();
if (Connection.State == ConnectionState.Open)
this.Controls.Clear();
else
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "alertbox",
"alert('Can not connect to server.')", true);

Dbconnection_txtServer.Text = _server;
Dbconnection_txtUser.Text = _userName;
Dbconnection_txtPass.Text = _password;
Dbconnection_txtdbname.Text = _databaseName;
}

}

catch (Exception ex)
{
LastError = ex.Message;
LoadDefaultConnectionString(IsEncrypted);
Dbconnection_txtServer.Text = _server;
Dbconnection_txtPass.Text = _password;
Dbconnection_txtUser.Text = _userName;
}
}
protected override void CreateChildControls()
{
Controls.Clear();

lbl_HeaderName = new Label();
lbl_HeaderName.ID = "lbl_HeaderName";
lbl_HeaderName.Text = "Server Credential";

lbl_servername = new Label();
lbl_servername.ID = "lbl_servername";
lbl_servername.Text = "Server Name";

Dbconnection_txtServer = new TextBox();
Dbconnection_txtServer.ID = "Dbconnection_txtServer";

lbl_username = new Label();
lbl_username.ID = "lbl_username";
lbl_username.Text = "User Name:";

Dbconnection_txtUser = new TextBox();
Dbconnection_txtUser.ID = "Dbconnection_txtUser";

lbl_password = new Label();
lbl_password.ID = "lbl_password";
lbl_password.Text = "Password:";

Dbconnection_txtPass = new TextBox();
Dbconnection_txtPass.ID = "Dbconnection_txtPass";

lbl_databasename = new Label();
lbl_databasename.ID = "lbl_databasename";
lbl_databasename.Text = "Database Name:";

Dbconnection_txtdbname = new TextBox();
Dbconnection_txtdbname.ID = "Dbconnection_txtdbname";

btnConnect = new Button();
btnConnect.ID = "btnConnect";
btnConnect.Text = "Connect";
btnConnect.Click += BtnConnect_Click;

btnCancel = new Button();
btnCancel.ID = "btnCancel";
btnCancel.Text = "Cancel";
btnCancel.Click += BtnCancel_Click;


//add controls
Controls.Add(lbl_password);
Controls.Add(lbl_databasename);
Controls.Add(lbl_servername);
Controls.Add(lbl_username);
Controls.Add(lbl_HeaderName);
Controls.Add(Dbconnection_txtdbname);
Controls.Add(Dbconnection_txtPass);
Controls.Add(Dbconnection_txtServer);
Controls.Add(Dbconnection_txtUser);
Controls.Add(btnConnect);
Controls.Add(btnCancel);
}
void ShowPage()
{
EnsureChildControls();
if (!_currentPage.Form.Controls.Contains(this))
_currentPage.Form.Controls.Add(this);
else
{
_currentPage.Form.Controls.Remove(this);
_currentPage.Form.Controls.Add(this);
}

Dbconnection_txtdbname.Text = _databaseName;
if (!_showDbName)
{
lbl_databasename.Visible = false;
Dbconnection_txtdbname.Visible = false;
}

//----------------------
if (_dialogName.IsEmptyOrNull()) return;
lbl_HeaderName.Text = "Fill " + _dialogName + " Information";
}


The idea is to show composite control when i call "ShowPage" method internally. the issue is when i create composite control in other pages,"ShowPage" work correctly but on the postbackes the "BtnConnect" click event not firing and only postback form occurs!!!

within couple of hours i found that when i add instance of WebDbConnection class to form controls in page_load event, my control work fine.

protected void Page_Load(object sender, EventArgs e)
{
Page.Form.Controls.Add(WebDbConnection_instance);
}

but how to do this adding controls inside my control not on customer page_load event?

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