C# parse string “0” to integer

Question

I have a new laptop at work and code that worked earlier in the week does not work today.

The code that worked before is, simplified:

while (dr.Read         


        

Answer 1

Edit:
@Mike's response made me think that is extremely odd behavior and a simple google search yielded this result: int.Parse weird behavior

An empty string would also cause this issue.

You could check for dbnull before parsing, also it is good to validate parsed data.

You could use a default value and TryParse..

int i = -1;
if(!int.TryParse(dr["MyColumn"] as string, out i))
   //Uh Oh!

Edit:
I posted this as a comment in @Chris' answer, but if the sql datatype is int then why not just use the GetInt32 method on the DataReater instead of retrieving it as a string and manual parsing it out?