(.NET) rasterlayer nodata value in axmapcontrol

[SébastienGagnon]

Hi!

I'm looking for a code in .net that take a rasterlayer (.tiff) and display it in my mapcontrol with transparency where is no data value. I know i can add it to my mapcontrol with this code

Dim pRasterly1 As IRasterLayer
        pRasterly1 = New RasterLayer

        pRasterly1.CreateFromFilePath()

But how can i change the black background of raster (no data value) to transparency?

Thanks

[TimParis]

You might be seeing the same issue as this poster
http://forums.arcgis.com/threads/27046-Transparency-With-Dynamic-Map?highlight=dynamicCacheLayerMana...

[SébastienGagnon]

Thank you! This solved my problem!In Arcmap i created a new layergroup add my rasters and save as layer file. For code i simply used:

Me.axmapcontrol1.addlayerfromfile(" ")

No more black background!