Register ArcSDE geodatabse (C #)

Public void dataset_register (ref istepprogressor pstepprogressor, ref idataset pgisdataset)
{
Ienumdataset penumdataset;
Idataset pdataset;
Iversionedobject pversionedobject;

Try
{
// Dataset_register = "" 'process error mark "" correct, "F" error
If (pgisdataset! = NULL)
{
Pversionedobject = (iversionedobject) pgisdataset;
If (pversionedobject. isregisteredasversioned)
Pstepprogressor. Message = "GIS layer registered ";
Else
{
Pstepprogressor. Message = "GIS layer version registration in progress ";
Pversionedobject. registerasversioned (true );
Pstepprogressor. Message = "GIS layer registration successful ";
}
Pversionedobject = NULL;
}
}

Catch
{

}
}