https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.gridviewcolumn.actualwidth?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
GridViewColumn.ActualWidth Property (System.Windows.Controls) | Microsoft Learn
Gets the actual width of a GridViewColumn.
property systemwindowscontrolsmicrosoftlearn