C# - System.FormatException: Input string was not in a correct format.

Question

Several years ago I had some software developed in C#. 

We have several people using this software in many locations.  Today, the software began to display the following message when you try to change the COM Port settings in the software:

System.FormatException: Input string was not in a correct format.

The only thing that we can put it down to is a windows update, as the software has worked for years on these PC's, and only the ones that have had a windows update appear to have this problem.

Has anyone else had this experience? (Software tried and tested for several years - then all of a sudden this error appears - System.FormatException: Input string was not in a correct format.)

If so, does anyone have a solution for it?

Thanks in advance, Steve.

Answer 1

Checkout DateTime Format of the system

Answer 2

Hi,

It's hard for us to see the problem. I found this in a thread :this exception will be thrown when you convert a null value to a meaningful value:

You can't convert a null value to a meaningful value through Convert.  Your best option is to check for null first and then assign a value of 0 (or whatever) to the result (whereever Convert was sending its results too).

http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/fc6b2e87-3d54-4608-b6bf-4723613333bf

Please check out if the exception is thrown from the snippet that converts value.

Harry

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