C # Add two methods for the picturebox control to the Image Selection status

Method 1:

The simple method is to change the borderstyle style of the picturebox control.

CurrentSelectPicBox. BorderStyle = BorderStyle. Fixed3D;
CurrentSelectPicBox. Refresh (); // force the control to redraw

Method 2

Adding a rectangle to the picturebox control makes this method slow in the program.

To add a rectangle frame:
Graphics pictureborder = currentSelectPicBox. CreateGraphics ();
Pen pen = new Pen (Color. Red, 2 );
Pictureborder. drawRectangle (pen, currentSelectPicBox. clientRectangle. x, currentSelectPicBox. clientRectangle. y, currentSelectPicBox. clientRectangle. X + currentSelectPicBox. clientRectangle. width, currentSelectPicBox. clientRectangle. Y + currentSelectPicBox. clientRectangle. height );
How to remove a rectangle

CurrentSelectPicBox. Invalidate ();

If you have a better way to share it with us