c# - Winform Custom Control: DesignMode doesn't return true whereas in Design Mode

Question

I learnt about DesignMode here How to refresh a winform custom control at design time after changing a property

But when in the constructor of my custom control I use it, it never returns true so when I drag and drop my custom control it always show max = 200 so what's wrong?

if (this.DesignMode)
{                
    this.Min = 0;
    this.Max = 100;
} 
else 
{
    this.Min = 0;
    this.Max = 200;            
}

this.LabMin.Text = this.Min.ToString();
this.LabMax.Text = this.Max.ToString();  

Answer 1

LicenseManager.UsageMode is intended for this.

It is in fact the only reliable way to detect if your control is in design mode or not. It's only valid during the constructor, but it can easily be stored in a field of the class for later reference.

The DesignMode property for nested controls will be false even when the container control is in design mode.