The Page_load event of the ASP.NET page life cycle assures that all controls are completely loaded. Even though the controls are also accessible in Page_Init event but here, the viewstate is incomplete.
The ValidationSummary control in ASP.NET displays summary of all the current validation errors.
In case it is required for a server side control to postback when any of its event is triggered, then the AutoPostBack property of this control is set to true.
Web.config file is used to make the settings to a web application, whereas Machine.config file is used to make settings to all ASP.NET applications on a server(the server machine).
Use the Session.abandon() method.
TxtBox123.Focus (); OR Page.SetFocus (NameOfControl);
Use the asp:Xml control and set its DocumentSource property for associating an xml file, and set its TransformSource property to set the xml control’s xsl file for the XSLT transformation.