Combinations and Permutations question

    public static String[] getCombinations(String[] sourceArray,int size)
     {int i,j;
      int sourceLength=sourceArray.Length;
      if (sourceLength<size) {size=sourceLength;}
      int[] indices=new int[size];
      int count=1;
      for (i=0;i<size;)
       {count*=(sourceLength-i);
        count/=++i;
       }
      String[] items=new String[count];
      int indexCap=1+sourceLength-size;
      for (i=0;i<count;++i)
       {for (j=0;j<size;++j) {items[i]+=sourceArray[j+indices[j]]+" ";} 
                              items[i]=items[i].Substring(0,items[i].Length-1);
        while (0<j) 
         {indices[--j]++;
          if (indices[j]<indexCap) {break;}
         }
        if (indices[0]<indexCap)
         {for (j=0;j<size;++j) {if (indices[j]==indexCap) {indices[j]=indices[j-1];}}}
       } 
      return items;
     }