Server Error in '/' Application.

The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.

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.FormatException: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.

Source Error:


Line 207:        byKey = System.Text.Encoding.UTF8.GetBytes(DecryptKey.Substring(0, 8));
Line 208:        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
Line 209:        inputByteArray = Convert.FromBase64String(str);
Line 210:        MemoryStream ms = new MemoryStream();
Line 211:        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

Source File: c:\inetpub\webserver\prodi\7_FK\App_Code\cryptograp.cs    Line: 209

Stack Trace:


[FormatException: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. ]
   System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength) +14474273
   System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength) +131
   System.Convert.FromBase64String(String s) +50
   cryptograp.Decrypt_QueryString(String str) in c:\inetpub\webserver\prodi\7_FK\App_Code\cryptograp.cs:209
   explanation.Page_Load(Object sender, EventArgs e) in c:\inetpub\webserver\prodi\7_FK\explanation.aspx.cs:48
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0