The design environment of winform is maintained by the control container. When the control is nested in a container space without a design environment, it is actually in the running state.

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 ///   <Summary>  ///  Title: gets a value to indicate whether system. componentmodel. component is in design mode.  ///  Description: The designMode has a bug in Visual Studio 2005. The following method can be used to solve this problem.  ///  Detailed information address:  Http://support.microsoft.com /? SCID = KB  ; ZH-CN; 839202 & X = 10 & Y = 15  ///   </Summary> Protected   New   Bool  DesignMode {  Get  {  Bool Returnflag = False  ;  # If Debug If (System. componentmodel. licensemanager. usagemode = System. componentmodel. licenseusagemode. designtime) {returnflag = True ;}  Else   If (System. Diagnostics. process. getcurrentprocess (). processname. toupper (). Equals ( "  Devenv  "  ) {Returnflag = True  ;}  # Endif          Return  Returnflag ;}}