System.FormatException: Invalid length for a Base-64 char array or string. at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength) at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength) at System.Convert.FromBase64String(String s) at CheckCollegeUser.Decrypt(String cipherText) in d:\inetpub\vhosts\spec.edu.in\httpdocs\App_Code\CheckCollegeUser.cs:line 72 at spias_index.aboutcontent() in d:\inetpub\vhosts\spec.edu.in\httpdocs\spias\index.aspx.cs:line 292