After ASP. NET uses alert to pop up the dialog box, the CSS style becomes invalid and the font becomes larger.

Response. Write ("<SCRIPT> alert ('deleted successfully'); </SCRIPT>") used in the pop-up Prompt window. I don't know why it cannot be used.
The solution is as follows:
Use Page. Clientscript. registerstartupscript ( This . GetType (), "" , " <SCRIPT> alert ('xxxx'); </SCRIPT> " );Replace the Original Writing Method
You can write a method for multiple use.
Public static void webmessagebox (system. Web. UI. Page, string values)
{
Page. clientscript. registerstartupscript (page. GetType (), "", "<script language = JavaScript> alert ('" + values + "') </SCRIPT> ");
}
You can call webmessagebox (this. Page, "*********") in this way on the page ,"*******");

It is said that the response. Write output script disrupted the page execution sequence.