what's best proceed copy/fill infinite array smaller array c#?

i have infinite int[] array many smaller int[] array. i wish fill adult infinite array values little array, repeat duplicating little array infinite array until full (so large[0] = large[13] = large[26] ... = small[0] etc.). i already have rudimentary method:

int isource = 0;
for (int i = 0; i < destarray.length; i++)
{
    (isource >= sourcearray.length)
    {
        isource = 0; // reset during finish source
    }
    destarray[i] = sourcearray[isource++];
}

but i need something some-more elegant, hopefully faster.