Solve vs design exceptions

During vs development, if the custom control overwrites the OnLoad, PreLoad, and other methods, a Null exception is reported during the design of the interface because the system automatically runs OnLoad and other methods in the "design" Status of,
Some empty objects will report errors. Add the DesignMode on the Internet. For example: Protected override void OnLoad (EventArgs e)
{
Base. OnLoad (e );
If (! DesignMode)
Init ();
}

However, DesignMode does not often play a role.
In this case, we need to override the DesignMode attribute. Public new bool DesignMode
{
Get {return System. Diagnostics. Process. GetCurrentProcess (). ProcessName = "devenv ";}
}