https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.systeminformation.dragsize?view=netframework-2.0&devlangs=csharp&f1url=%3FappId%3DDev12IDEF1%26l%3DEN-US%26k%3Dk(System.Windows.Forms.SystemInformation.DragSize);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv2.0);k(DevLang-csharp)%26rd%3Dtrue
SystemInformation.DragSize Property (System.Windows.Forms) | Microsoft Learn
Gets the width and height of a rectangle centered on the point the mouse button was pressed, within which a drag operation will not begin.
property systemwindows formsmicrosoftlearn