Hi hemant.kaushal, Go to Control Pannel --> Administrative Tools --> Microsoft .NET Framework 2.0 Configuration. Open My Computer-->Runtime security policy-->Machine-->Code Groups-->All codes. Go to All_Code-->Right click and select New-->Check new code group and give some name in it. Hit Next button. Choose Condition type to SITE and give site name to localhost/system name.Hit Next and Choose Full Trust and hit Next button and then run ur site. Regards, Dilip. Dilip