Checking last index of the array giving me a problem. VS2005 C#

[foolios]

        private void CreateMaze(int h, int w)
        {
            int r = h * w;
            Room[] rooms = new Room[r];
            Random rm = new Random();
            int newrm = rm.Next(0, r);
            int nrmcntr = newrm;
            do
            {
                rooms[newrm].rWall = "|";
                if (newrm == rooms.Length() -1)
                {
                    newrm = 0;
                }
                newrm += 1;
            } 
            while (newrm != nrmcntr);
 

At the line:
if (newrm == rooms.Length() -1)
I am trying to compare an integer to the last index of an array of room objects.

I get the error:
Method name expected
at that line but have no clue.

Thank you in advance for any explanations.

[Reccy]

if (newrm == rooms.Length() -1)

should be rooms.Length - 1

~~