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WPF: Change background at runtime
How do I change the background color of a WPF element at runtime?
You can fill the background of a WPF element with a brush
To do this you have to fill the FrameworkElement.Background with a new SolidColorBrush.
A SolidColorBrush can be created directly from the colors red green and blue using Color.FromArgb (..)

btnMoveTo_Subfolders.Background = new SolidColorBrush(Color.FromArgb( a:255, r:0, 255, 0));

In the view:
The background color of the button was set to Red = 255.
Alpha = 255 means full colors, alpha = 0 means full transparency

Parameters for Color.FromArgb
1.Parameter Alpha is equivalent to the opposite transparency
0 = transparent 255 = full color
// * Parameters Color.FromArgb (Alpa: 150, Red: 0, Green: 255, Blue: 0)
// * alpha 0 = transparent 255 = fullcolor

Code example in C # for adjusting the background color of a button control

public void check_BtnMove_on_Titels_filled()
//----------------< check_UcFolders_Titels_filled() >----------------
//*Parameters Color.FromArgb(Alpa:150, Red:0, Green:255, Blue:0)
//*Alpha 0=transparent 255=full color
if (check_UcFolders_Titels_filled()==true )
//to green
btnMoveTo_Subfolders.Background = new SolidColorBrush(Color.FromArgb( 150, 0, 255, 0));
//to red
btnMoveTo_Subfolders.Background = new SolidColorBrush(Color.FromArgb(150, 255, 0, 0));

//----------------</ check_UcFolders_Titels_filled() >----------------

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