Server Error in '/ExamSys21' Application.

Padding is invalid and cannot be removed.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[CryptographicException: Padding is invalid and cannot be removed.]
   System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast) +3022
   System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) +425
   System.Security.Cryptography.CryptoStream.FlushFinalBlock() +47
   System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing) +53
   System.IO.Stream.Close() +26
   BAL.QueryStringEncryptionModule.Decrypt(String inputText) in G:\NIC\RegistrationCodeAll\RegistrationCode2021Live\RegistrationCode2021Live\BAL\QueryStringEncryptionModule.cs:124
   BAL.QueryStringEncryptionModule.context_BeginRequest(Object sender, EventArgs e) in G:\NIC\RegistrationCodeAll\RegistrationCode2021Live\RegistrationCode2021Live\BAL\QueryStringEncryptionModule.cs:36
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +139
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0