Padding is invalid and cannot be removed while decrypting

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C#

ASP.NET

I am using following code to decrypt a text file.It gives me exception on "Padding is invalid and cannot be removed" on "while ((data = cs.ReadByte()) != -1)" line.

private void Decrypt(string inputFilePath, string outputfilePath)
{
string EncryptionKey = "MAKV2SPBNI99212";
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (FileStream fsInput = new FileStream(inputFilePath, FileMode.Open))
{
using (CryptoStream cs = new CryptoStream(fsInput, encryptor.CreateDecryptor(), CryptoStreamMode.Read))
{
using (FileStream fsOutput = new FileStream(outputfilePath, FileMode.Create))
{
int data;
while ((data = cs.ReadByte()) != -1)
{
fsOutput.WriteByte((byte)data);
}
}
}
}
}
}

How to solve it?