Solution to error in Javascript script output using response. Write in Ajax

In this period of time, when Ajax is used, the old ASP. NET Program Upgrade to the Ajax program. During the upgrade, you can find that response. Write ("<SCRIPT> alert ('data is successfully added! ') </SCRIPT> ") Code An error occurred during execution. find the solution on the Internet. Most of the solutions on the Internet are changed to scriptmanager. registerstartupscript (updatepanel1, typeof (updatepanel), "AAA", "<SCRIPT> alert ('data added successfully! ') </SCRIPT> ", true); including the solution on the p104 page in <ASP. NET Ajax> by Chen lifu.
Because we now use Ajax (2008) in Visual Studio 3.5 beta2, when I use the preceding statement for processing, the system does not run the expected script to exit the dialog box, I wonder if Ajax 3.5 has been changed. later, I tried to add scriptmanager. registerstartupscript (updatepanel1, typeof (updatepanel), "AAA", "<SCRIPT> alert ('data added successfully! ') </SCRIPT> ", true); the final true value in the script changes to scriptmanager. registerstartupscript (updatepanel1, typeof (updatepanel), "AAA", "<SCRIPT> alert ('data added successfully! ') </SCRIPT> ", false); then you can write a common message prompt class.

Public class MessageBox
{

Private httpcontext mycontext = NULL;
Public MessageBox (httpcontext currentcontext)
{
Mycontext = currentcontext;
}
/// <Summary>
/// Customize the pop-up window content
/// </Summary>
/// <Param name = "MSG"> </param>
Public void show (string MSG)
{
// Mycontext. response. Write ("<SCRIPT> alert ('" + MSG + "'); </SCRIPT> ");
Scriptmanager. registerstartupscript (system. web. UI. page) mycontext. currenthandler, typeof (system. web. UI. page), "AAA", "<SCRIPT> alert ('" + MSG + "'); </SCRIPT>", false );
}
/// <Summary>
/// Customize the pop-up window content and switch to a new page
/// </Summary>
/// <Param name = "MSG"> Custom message </param>
/// <Param name = "url"> new page to be transferred </param>
Public void show (string MSG, string URL)
{
// Mycontext. response. write ("<SCRIPT> alert ('" + MSG + "'); javascript: Location = '" + URL + "'; </SCRIPT> ");
Scriptmanager. registerstartupscript (system. web. UI. page) mycontext. currenthandler, typeof (system. web. UI. page), "AAA", "<SCRIPT> alert ('" + MSG + "'); javascript: Location = '" + URL + "'; </SCRIPT> ", false );

}
/// <Summary>
/// Customize the pop-up window content to determine whether to close the current page
/// </Summary>
/// <Param name = "MSG"> </param>
/// <Param name = "close"> </param>
Public void show (string MSG, bool close)
{
If (close)
{
// Mycontext. response. Write ("<SCRIPT> alert ('" + MSG + "'); javascript: window. Close (); </SCRIPT> ");
Scriptmanager. registerstartupscript (system. web. UI. page) mycontext. currenthandler, typeof (system. web. UI. page), "AAA", "<SCRIPT> alert ('" + MSG + "'); javascript: window. close (); </SCRIPT> ", false );
}
Else
{
// Mycontext. response. Write ("<SCRIPT> alert ('" + MSG + "'); </SCRIPT> ");
Scriptmanager. registerstartupscript (system. web. UI. page) mycontext. currenthandler, typeof (system. web. UI. page), "AAA", "<SCRIPT> alert ('" + MSG + "'); javascript: window. close (); </SCRIPT> ", false );
}
}
}