Reset Map Extent

[EricElder]

I would like to completely reset the extent of a map.  I have tried:

MyMap.Extent = new Envelope();

This does not work.  It keeps the original extents even after I have deleted all the layers in the map.  Any recommendations?

Basically I'm refreshing the map with all new added layers and need a new extent.

[EricElder]

I think I solved it...

MyMap.Layers.Clear();
MyMap.Extent = new Envelope();

Then add new layers.

[PreetiMaske]

After all layers are removed and new layers are added you would need to reset the map's extent to extent of all layers. Try this

MyMap.Extent=MyMap.Layers.GetFullExtent();