Add DTED data to a map layer

Hello

I'm working on a university project based on ARCGIS .NET SDK (I use C#). Now, I'm able to add maps and draw lines and stuff...
I want to add a .dt0 DTED file to axMapControl and add a function to MouseDown to MessageBox elevation (height) of mapX,mapY.
I googled "A LOT" and got confused. In the end, I managed to add DTED layer using RasterLayer.CreateFromFile but it adds a brown square :|
Can anyone has a snippet code for add DTED file (.dt0 or even maybe .dt1, .dt2)?

Thank you very much
Regards