.Net application is showing the "System.InvalidCastException: Conversion from string "0" to type 'Integer' is not valid.

Implement the following steps
1. Open the Regional and Language Options applet from the Control Panel.
2. Note the Current Format.
3. Change the Current Format to English (Australian)
4. Click Apply.
5. Change the Current Format to the noted format, eg, English (US).
6. Click Apply and then click OK.
Related Knowledge Base Articles
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http://support.microsoft.com/default.aspx?scid=kb;EN-US;942460
http://support.microsoft.com/default.aspx?scid=kb;EN-US;948478