test.cs

for (int j = 0; j < 8; j++)
{
   long firstCalc = CRCTable[counterOne] << 1;
   long secondCalc = CRCTable[counterOne] & (1 << 31); //or CRCTable[counterOne] & (5)
   CRCTable[counterOne] = firstCalc ^ ((secondCalc == 0)? polynom : 0);
}


//Or this would also be equivelant

for (int j = 0; j < 8; j++)
{
   CRCTable[counterOne] =  (CRCTable[counterOne] << 1) ^ (((CRCTable[counterOne] & (1 << 31)) == 0)? polynom : 0);
}

//or this
for (int j = 0; j < 8; j++)
{
    long firstCalc = CRCTable[counterOne] << 1;
    long secondCalc;
    if ((CRCTable[counterOne] & (1 << 31)) == 0)
        secondCalc = polynom;
    else 
        secondCalc = 0
    CRCTable[counterOne] = firstCalc ^ secondCalc;
}