Marshaling a structure conatining a fixed length array of another structure in C#

[kishor14]

I need an example of how to marshal a structure that has
an array of another structures as a member. An example as mentioned below

[StructLayout(LayoutKind.Sequential)]
        public struct strcutdata        {
                        public System.UInt16 ln;
                          public int in;
                        public System.UInt32 tn;
 
 
        }
 
        [StructLayout(LayoutKind.Sequential,Size=320)]
        public struct structContainer
        {
 
                      public strcutdata []arrCont;
 
 
        }
 

When I create an object of "strcutdata" and pass it as reference to the unmanaged function it gives me a "Null reference exception". Please provide me a solution on this.


Thanks in advance..