How can i determine whether the password entered by user is right or wrong ?

See more:

C#

How can i determine whether the password entered by user is right or wrong in program ? Generally when wrong password is entered a file with garbage data is created.

Here's the code -

private void DecryptFile(string inputFile2, string outputFile2)
   {

       try
       {
           string password = password2;      // password2 is data coming through textbox

           System.Text.UnicodeEncoding UE = new System.Text.UnicodeEncoding();
           byte[] key = UE.GetBytes(password);

           FileStream fsCrypt = new FileStream(inputFile2, FileMode.Open);


           RijndaelManaged RMCrypto = new RijndaelManaged();

           RMCrypto.Padding = PaddingMode.None;


           CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateDecryptor(key, key), CryptoStreamMode.Read);

           FileStream fsOut = new FileStream(outputFile2, FileMode.Create);

           int data;

           while ((data = cs.ReadByte()) != -1)

           fsOut.WriteByte((byte)data);

               fsOut.Close();
               cs.Close();
               fsCrypt.Close();
                return;


       }

       catch(Exception e)
       {
           MessageBox.Show("Your password does not match"+e.Message);
           DeLoadImage_tbx.Text = "";  //Stegno image
           DeSaveFile_tbx.Text = "";   // Location to save data file
           textBox3.Text = "";        // textbox control for accepting password

       }

   }

   }