The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases. How to solve this error?

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ASP.NET

C#3.5

SQL-Server-2008R2

Dear All,

I have created on Employee project using SQL Server 2008 R2.

I have a got an error when loading the page like,

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

Is there any error using MessageBox

private void MessageBox(string Message)
    {
        Label lblMessageBox = new Label();

        lblMessageBox.Text = "<script language='javascript'>" + Environment.NewLine + "window.alert('" + Message + "')</script>";
        Page.Controls.Add(lblMessageBox);
    }

Note: No.of times I have used MessageBox("alert message."); for alert messages

Please tell me solution. Thanks in advanced.