How do I fix :Cannot convert null to double?

Question

 hello,

 

Do I am reading an Excel spredsheet and puting the data into arrays like so:

string col1[] = new string[rowCount]; //This is fine

double col2[] = new double[rowCount];

for(int i -= 1, i <= rowCount - 1 ; i++)

{

   col1[i] = myWorkBook.Cells[i + 1, 1].Value;

   col2[i] = myWorkBook.Cells[i + 1, 2].Value; //Throws Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'Cannot convert null to 'double' because it is a non-nullable value type

 

I tried doing my array as Nullable but that an 8.0 feature and still in 7.3 and cannot upgrade is there a fix to this?

 

Thanks