Hello,

This is not an issue in the controls. We are loading the tile images with the Microsoft Image.FromFile method. Loading images from the file system may lock the files on some Windows systems.  The same error can be reproduced in a similar scenario in an empty form without the RadMap control.

The scenario in the project requires to delete the images from the file system as soon as the  form with the map closes. A custom map provider loading the images as Bitmaps can help:

public class CustomLocalMapProvider : LocalMapProvider
{
    public override Image LoadTile(int x, int y, int zoom)
    {
        string key = Path.Combine(this.DirectoryPath, string.Format(this.FileFormat, x, y, zoom));
        Image tile;

        if (File.Exists(key))
        {
            using (var bmpTemp = new Bitmap(key))
            {
                tile = new Bitmap(bmpTemp);
            }
        }
        else
        {
            tile = this.NoImageAvailable;
        }

        return tile;
    }
}

It is also necessary to call the map`s Dispose method when closing the form.

Regards,
Dimitar
Progress Telerik