Beginner hashing & salting

So I'm rather new to programming (C#) and especially cryptography in general. I tried learning some by copying a couple of functions using the MD5 hashing algorithm and learning how it works. I then connected to a database and made a log in and reset password feature. However, the problem appeared when i tried making the same password, i realised the hashing value would turn out the same regardless of me adding a randomly generated salt into the hash value.

    string MD5(string input)
    {
        MD5 md5 = new MD5CryptoServiceProvider();                                  
        byte[] bytes = md5.ComputeHash(Encoding.Unicode.GetBytes(input));          
        string result = BitConverter.ToString(bytes).Replace("-", String.Empty); 
        return result.ToLower();
    }
    public static byte[] GenerateSalt()
    {
        RNGCryptoServiceProvider saltGenerator = new RNGCryptoServiceProvider();
        byte[] salt = new byte[24];
        saltGenerator.GetBytes(salt);
        return salt;
    }

So this are my functions for generating salt and hashing an input string. This is the code for resetting passwords by filling out two textboxes in WinForms.

        private void HashNewPassword(out byte[] salt, out string hashedPassword)
    {
        string tempHash;
        salt = null;
        hashedPassword = null;

        if (txtPassword1.Text == txtPassword2.Text)
        {
            tempHash = txtPassword1.Text;
            salt = GenerateSalt();
            hashedPassword = MD5(MD5(tempHash + salt));
        }
        else
        {
            throw new Exception();
        }
    }

Lastly, the click-even function:

        private void btnFinished_Click(object sender, EventArgs e)
    {
        try
        {
            string hashedPassword;
            byte[] salt;

            HashNewPassword(out salt, out hashedPassword);
            AddPasswordToDB(salt, hashedPassword);
        }
        catch (Exception error)
        {
            MessageBox.Show(error.Message + "   :   " + error.GetType().ToString());
        }
    }

As you can see below, the hash value is the same, but the salt differs. Am I adding the salt in a way I should not?

bec78d2acfd2eb4f5d7da2fd231bad1c     0x21B5F48096E31092FCCD20EE22EF9B3C307ADDC1C31B8D84          
bec78d2acfd2eb4f5d7da2fd231bad1c     0xC063774EBBD4FAED268811C84D70662F4DDB53BCA52A6720  

Is there a logical explanation to this, or is there something wrong with the code? Also, I am not familiar with hashing algorithms, just something I stumbled across and wanted to learn more about. Is there an easier way of doing this? I have read about other algorithms that seems easy enough to use, but as I stated, I am not familiar with this. Security differences between hash algorithms is irrelevant. I did read MD5 was old and not that secure, however it's more than enough for my use.

Thanks in advance.