how to save custom layer as mxd

[RatikantaLenka]

i want to save a custom raster layer as mxd. pls guide me

[DanPatterson_Retired]

an mxd is the project that contains layers.  I don't understand what you mean about saving a layer as a project

[RatikantaLenka]

i open a blank arcmap. add a custom layer into it and then want to save it as mxd.

my requirement is when i will reopen the saved mxd, then it should be displayed with the layer data.

i am using IPersistStream interface in it, but it failed to work.

pls guide me

[DanPatterson_Retired]

have you look at the help specific to your developing environment?