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GdiPlusRasterLayer layer = new GdiPlusRasterLayer("C:\\Share\\world.jpg");
layerOverlay.Layers.Add(layer);

layer.Open();
RectangleShape layerExtent = layer.GetBoundingBox();
double maxScale = ExtentHelper.GetScale(layerExtent, (float)Map1.ActualWidth, Map1.MapUnit);

// Modify 3 to any other value which means how many level lower than the maximum scale
double minScale = maxScale / Math.Pow(2, 3);
layer.Close();

Map1.MaximumScale = maxScale;
Map1.MinimumScale = minScale;

// You can also set the scale on the layer
//layer.UpperThreshold = maxScale;
//layer.LowerThreshold = minScale;