ExcelCellBase.IsValidAddress(string address) not working correctly

[ghost]

The static method ExcelCellBase.IsValidAddress(string address) accepts as a valid Range address the following strings:

1. $A12:XY1:3
2. $A12:X$Y$13

for the first string the problem is that there is no check if the chracter ':' that is found is the only one.
I would suggest the following solution:
near line 763 change the following code:
else if (address[i] == ':') { isSecond=true; }
to
else if (address[i] == ':') { if (isSecond) return false; isSecond=true; }

For the second string more checks must be added before deciding that it is safe to ignore the '$' character.

Best regards,
Ivan Temelkov